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Subject: Olig2 Directs Astrocyte and Oligodendrocyte Formation in Postnatal Subventricular Zone Cells -- Marshall et al. 25 (32): 7289 -- Journal of Neuroscience
Date: Thu, 16 Nov 2006 18:44:00 +0100
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<P><A href=3D"http://www.jneurosci.org/cgi/content/short/25/32/0-i"><IMG =

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<P><STRONG><FONT color=3D#a70716=20
size=3D-1>Development/Plasticity/Repair</FONT></STRONG><BR><STRONG><FONT =

size=3D+2>Olig2 Directs Astrocyte and Oligodendrocyte Formation in =
Postnatal=20
Subventricular Zone Cells </FONT></STRONG>
<P><STRONG></NOBR><NOBR>Christine A. G. Marshall,<SUP>1</SUP></NOBR>=20
<NOBR>Bennett G. Novitch,<SUP>1</SUP><SUP>,2</SUP><SUP>,4</SUP></NOBR> =
and=20
<NOBR>James E. Goldman<SUP>1</SUP><SUP>,3</SUP></NOBR> </STRONG>
<P><SUP>1</SUP>Center for Neurobiology and Behavior, =
<SUP>2</SUP>Department of=20
Biochemistry and Molecular Biophysics, and <SUP>3</SUP>Department of =
Pathology,=20
Columbia University, College of Physicians and Surgeons, New York, New =
York=20
10032, and <SUP>4</SUP>Department of Cell and Developmental Biology, =
University=20
of Michigan Medical School, Ann Arbor, Michigan 48109=20
<P>
<P><A name=3DABS><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/rarrow.gif"=20
      width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      Abstract </FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#top"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Top<BR></A><IMG height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      color=3D#464c53>Abstract</FONT><BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#SEC1"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>Introduction<BR></A><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#SEC2"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>Materials and Methods<BR></A><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#SEC3"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>Results<BR></A><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#SEC4"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>Discussion<BR></A><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#BIBL"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/darrow.gif" width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>T=
he=20
subventricular zone (SVZ) in the neonatal mammalian forebrain<SUP>=20
</SUP>simultaneously generates olfactory interneurons, astrocytes,<SUP>=20
</SUP>and oligodendrocytes. The molecular cues that enable SVZ =
progenitors<SUP>=20
</SUP>to generate three distinct cell lineages without a temporal<SUP>=20
</SUP>switching mechanism are not known. Here, we demonstrate that<SUP>=20
</SUP>the basic helix-loop-helix transcription factor Olig2 plays<SUP> =
</SUP>a=20
central role in this process. Olig2 is specifically expressed<SUP> =
</SUP>in=20
gliogenic progenitors in the postnatal SVZ and by all glial<SUP> =
</SUP>lineages=20
derived from this structure. By expressing normal and<SUP>=20
</SUP>dominant-interfering forms of Olig2 <I>in vivo</I>, we show that=20
Olig2<SUP> </SUP>repressor function is both sufficient and necessary to=20
prevent<SUP> </SUP>neuronal differentiation and to direct SVZ =
progenitors=20
toward<SUP> </SUP>astrocytic and oligodendrocytic fates. Although Olig2=20
activity<SUP> </SUP>has been associated previously with motor neuron and =

oligodendrocyte<SUP> </SUP>development, our findings establish a =
previously=20
unappreciated<SUP> </SUP>role for Olig2 in the development of =
astrocytes.=20
Furthermore,<SUP> </SUP>these results indicate that Olig2 serves a =
critical role=20
in<SUP> </SUP>pan-glial versus neuronal fate decisions in SVZ =
progenitors,<SUP>=20
</SUP>making it the first intrinsic fate determinant shown to =
operate<SUP>=20
</SUP>in the early postnatal SVZ.<SUP> </SUP>
<P>
<P><STRONG><I>Key words:</I> <B>SVZ</B>; <B>olig2</B>; =
<B>neurogenesis</B>;=20
<B>gliogenesis</B>; <B>development</B>; <B>forebrain</B></STRONG>
<P><A name=3DSEC1><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/rarrow.gif"=20
      width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      Introduction </FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#top"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#ABS"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Abstract<BR></A><IMG height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      color=3D#464c53>Introduction</FONT><BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#SEC2"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>Materials and Methods<BR></A><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#SEC3"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>Results<BR></A><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#SEC4"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>Discussion<BR></A><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#BIBL"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/darrow.gif" width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>I=
n the=20
developing telencephalon, the neuroepithelium gives rise<SUP> </SUP>to =
the=20
subventricular zone (SVZ), a secondary proliferative<SUP> </SUP>layer of =

progenitors that simultaneously generates both neurons<SUP> </SUP>and =
glia (for=20
review, see Marshall et al., 2003<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF26"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>). The contemporaneous<SUP> </SUP>production of neurons =
and glia=20
makes the SVZ a unique system<SUP> </SUP>in which to study the molecular =

mechanisms directing cell fate<SUP> </SUP>decisions. During the =
perinatal=20
period, the SVZ expands to include<SUP> </SUP>an angular prominence =
between the=20
developing striatum and subcortical<SUP> </SUP>white matter (see <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG1">Fig.=20
1<I>A,B</I></A>) and forms a continuous structure<SUP> </SUP>with the =
rostral=20
migratory stream (RMS) (see <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG1">Fig.=20
1<I>A,C</I></A>). SVZ<SUP> </SUP>progenitors specified to a neuronal =
lineage=20
migrate rostrally<SUP> </SUP>to the olfactory bulb and differentiate =
into=20
granular and periglomerular<SUP> </SUP>interneurons (Altman, 1969<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF2"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>; Luskin, 1993<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF22"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>; Lois and Alvarez-Buylla,<SUP> </SUP>1994<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF20"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>). In contrast, cells specified to become glia migrate=20
radially<SUP> </SUP>from the SVZ into the subcortical white matter, =
corpus=20
callosum,<SUP> </SUP>striatum, and medial, dorsal, and lateral areas of =
the=20
cerebral<SUP> </SUP>cortex, where they differentiate into astrocytes and =

oligodendrocytes<SUP> </SUP>(see <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG1">Fig.=20
1<I>C</I></A>) (Marshall et al., 2003<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF26"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>).<SUP> </SUP>
<P>The point at which SVZ progenitors commit to neuronal versus<SUP> =
</SUP>glial=20
lineages is not known. Studies of SVZ cell migration suggest<SUP> =
</SUP>that=20
distinct glial and neuronal cell lineages are established<SUP> =
</SUP>within the=20
SVZ before long-range migrations into the forebrain<SUP> </SUP>(Suzuki =
and=20
Goldman, 2003<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF33"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>). However, a delineation of committed<SUP> =
</SUP>neuronal and=20
glial populations within the SVZ has not been possible<SUP> </SUP>thus =
far, and=20
molecules directing SVZ cell fate decisions (see<SUP> </SUP><A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG1">Fig.=20
1<I>D</I></A>) have not been identified.<SUP> </SUP>
<P>Comprehensive work on neuronal and glial specification in the<SUP>=20
</SUP>embryonic CNS has provided insight into molecular pathways =
involved<SUP>=20
</SUP>in fate decisions. Basic helix-loop-helix (bHLH) =
transcription<SUP>=20
</SUP>factors are important regulators of neuronal and glial cell<SUP>=20
</SUP>fates in the embryo (for review, see Bertrand et al., 2002<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF4"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>),<SUP> </SUP>but their involvement in postnatal fate =
decisions,=20
while anticipated,<SUP> </SUP>has not been well described. One family of =
bHLH=20
proteins, the<SUP> </SUP>Oligs, has received a great deal of attention =
for their=20
essential<SUP> </SUP>involvement in both motor neuron and =
oligodendrocyte=20
development<SUP> </SUP>in the embryonic spinal cord. Both Olig1 and =
Olig2 are=20
expressed<SUP> </SUP>in the embryonic and postnatal forebrain, but their =

function<SUP> </SUP>in the development of this structure remains poorly=20
understood.<SUP> </SUP>During embryogenesis, constitutive expression of =
Olig1 in=20
forebrain<SUP> </SUP>progenitors has been shown to promote the formation =
of=20
oligodendrocytes<SUP> </SUP>(Lu et al., 2001<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF21"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>). The function of Olig genes in the postnatal<SUP>=20
</SUP>forebrain, however, has not been evaluated, and progress in<SUP>=20
</SUP>this area has been hampered by the failure of Olig mutant =
mice<SUP>=20
</SUP>to survive embryonic development. Thus, other methods must be<SUP> =

</SUP>used to study the postnatal functions of Olig genes <I>in =
vivo</I>.<SUP>=20
</SUP>
<P>In this study, we use retroviral-mediated gene transduction<SUP> =
</SUP>to=20
express normal and dominant-interfering forms of Olig2 in<SUP> </SUP>SVZ =
cells.=20
We show that Olig2 repressor function is both sufficient<SUP> </SUP>and=20
necessary to prevent neuronal differentiation and to direct<SUP> =
</SUP>SVZ=20
progenitors toward astrocytic and oligodendrocytic fates.<SUP> =
</SUP>Together,=20
our findings demonstrate a previously unappreciated<SUP> </SUP>role for =
Olig2 in=20
astrocyte development and establish that Olig2<SUP> </SUP>directs the =
primary=20
specification of pan-glial versus neuronal<SUP> </SUP>lineages within =
SVZ=20
progenitors in the neonatal forebrain.<SUP> </SUP>
<P><A name=3DSEC2><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/rarrow.gif"=20
      width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      Materials and Methods </FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#top"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#ABS"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Abstract<BR></A><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#SEC1"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Introduction<BR></A><IMG height=3D9 alt=3D" " =
hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      color=3D#464c53>Materials and Methods</FONT><BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#SEC3"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>Results<BR></A><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#SEC4"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>Discussion<BR></A><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#BIBL"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/darrow.gif" width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR><=
I>Retroviral=20
vectors and virus preparation</I>. All fragments encoding<SUP> =
</SUP>Olig2 or=20
mutant Olig2 and enhanced green fluorescent protein<SUP> </SUP>(eGFP) =
cDNAs were=20
subcloned into the bicistronic replication-incompetent<SUP> </SUP>viral =
vector=20
pQCXIX (Clontech, Cambridge, UK) 5' and 3' relative<SUP> </SUP>to an =
internal=20
ribosomal entry site (IRES), respectively. The<SUP> </SUP>pQCXIX vector =
uses a=20
cytomegalovirus immediate early promoter<SUP> </SUP>downstream of a 5' =
long=20
terminal repeat (LTR) to drive expression<SUP> </SUP>of both =
transcripts. Coding=20
fragments (Novitch et al., 2001<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF29"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>)<SUP> </SUP>were as follows: <I>mOlig2</I> (wild-type =
mouse Olig2,=20
<I>Eco</I>RI fragment<SUP> </SUP>from pCS2+6MTmOlig2), <I>cOlig2bHLH</I> =
(chick=20
Olig2 bHLH domains;<SUP> </SUP>amino acids 92-180; <I>Cla</I>I fragment =
from=20
pCS2+MTcOlig2bHLH-VP16),<SUP> </SUP><I>MTcOlig2bHLH-VP16</I> (chick =
Olig2 bHLH=20
domains fused to the herpes<SUP> </SUP>simplex VP16 transactivation =
domain;=20
<I>Cla</I>I fragment from pCS2+MTcOlig2bHLH-VP16),<SUP> </SUP>and =
<I>eGFP</I>=20
[<I>Eco</I>RV fragment provided by Satoshi Suzuki (Kyushu<SUP> =
</SUP>University,=20
Fukuoka, Japan)]. To generate virus, retroviral<SUP> </SUP>vectors were=20
cotransfected with the vesicular stomatitis virus<SUP> </SUP>G (VSV-G) =
viral=20
envelope into gp293 cells using Lipofectamine<SUP> </SUP>2000 =
(Invitrogen, San=20
Diego, CA). Growth medium was added to<SUP> </SUP>cells after 6 h, and=20
supernatant was harvested 48 h posttransfection.<SUP> </SUP>Viral stocks =
were=20
concentrated and titered to 1-3 <FONT face=3Darial,helvetica>x</FONT>=20
10<SUP>5</SUP> cfu/ml.<SUP> </SUP>The pNIT vector (provided by T. Palmer =
and S.=20
Suhr, The Salk<SUP> </SUP>Institute, La Jolla, CA) is a bicistronic=20
replication-incompetent<SUP> </SUP>retrovirus that uses a 5' LTR to =
drive=20
expression of the tetracycline<SUP> </SUP>activator and the tetracycline =
operon=20
enhancer/promoter to drive<SUP> </SUP>the expression of eGFP. pNIT virus =
was=20
prepared as described<SUP> </SUP>previously (Kakita and Goldman, 1999<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF15"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>).<SUP> </SUP>
<P><I>Retroviral injections</I>. Sprague Dawley rat pups at =
postnatal<SUP>=20
</SUP>day 2 (P2) to P3 were deeply anesthetized by immersion in ice<SUP> =

</SUP>water and positioned in a stereotactic apparatus, and 0.5 =
=B5l<SUP> </SUP>of=20
retrovirus solution was injected unilaterally at a rate of<SUP> =
</SUP>0.2 =B5l/min=20
using a 10 =B5l Hamilton (Reno, NV) syringe.<SUP> </SUP>Coordinates of =
the=20
injection site used for all experiments are<SUP> </SUP>1 mm anterior and =
1.5 mm=20
lateral to bregma at a depth of 2.0<SUP> </SUP>mm.<SUP> </SUP>
<P><I>Animals, histology, immunohistochemistry, and terminal=20
deoxynucleotidyl<SUP> </SUP>transferase-mediated biotinylated UTP nick =
end=20
labeling assay</I>.<SUP> </SUP>Human glial fibrillary acidic protein =
(hGFAP)-GFP=20
mice (The<SUP> </SUP>Jackson Laboratory, Bar Harbor, ME), C57BL/6J mice, =
and=20
Sprague<SUP> </SUP>Dawley rats (Charles River, Quebec, Canada) were=20
anesthetized<SUP> </SUP>by intraperitoneal injection of ketamine (75 =
mg/kg;=20
Aveco, Fort<SUP> </SUP>Dodge, IA) and xylazine (5 mg/kg; Mobay, Shawnee, =
KS) and=20
were<SUP> </SUP>transcardially perfused with 4% paraformaldehyde in PBS, =
pH<SUP>=20
</SUP>7.4. Mouse brains were postfixed after &lt;6 h, rat brains =
were<SUP>=20
</SUP>postfixed overnight, and all brains were cryoprotected with<SUP> =
</SUP>30%=20
sucrose/PBS. Olig2-GFP mice (B.G. Novitch and T. M. Jessell,<SUP>=20
</SUP>unpublished observation) were generated by disruption of the<SUP>=20
</SUP>coding region of Olig2 with an Ires-EGFP cassette and =
processed<SUP>=20
</SUP>as above. Serial coronal or parasagittal sections (see <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG1">Fig.<SUP>=20
</SUP>1 <I>A</I></A>) were cut (16-30 =B5m) using a cryostat, =
air-dried,<SUP>=20
</SUP>and stored at -80=B0C until use. Immunofluorescence was =
performed<SUP>=20
</SUP>using the following antibodies: rabbit anti-GFP (1:500; =
<!--ad--><A=20
href=3D"http://www.jneurosci.org/cgi/redirect-inline?ad=3DMolecular%20Pro=
bes">Molecular=20
Probes</A>,<SUP> </SUP>Eugene, OR), mouse anti-GFP (1:200; <!--ad--><A=20
href=3D"http://www.jneurosci.org/cgi/redirect-inline?ad=3DMolecular%20Pro=
bes">Molecular=20
Probes</A>),<SUP> </SUP>rabbit anti-Dlx2 (1:200; provided by J. =
Rubinstein,=20
University<SUP> </SUP>of California, San Francisco, San Francisco, CA), =
guinea=20
pig<SUP> </SUP>anti-olig2 [1:20,000 (Wichterle et al., 2002<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF35"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>); antibody specificity<SUP> </SUP>was confirmed by a =
complete lack=20
of labeling in olig2 mutants<SUP> </SUP>(supplemental Fig. 1, available =
at <A=20
href=3D"http://www.jneurosci.org/">http://www.jneurosci.org/</A> as <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289/DC1">supplem=
ental=20
material</A>),<SUP> </SUP>an expression pattern similar to <I>in =
situ</I>=20
hybridizations<SUP> </SUP>for olig2 transcript and a nonoverlap with =
olig1=20
immunoreactivity],<SUP> </SUP>mouse anti-CNPase (1:200; Sigma, St. =
Louis, MO),=20
mouse anti-ZebrinII<SUP> </SUP>(1:100; provided by R. Hawkes, University =
of=20
Calgary, Calgary,<SUP> </SUP>Alberta, Canada), rabbit anti-GFAP (1:1000; =
Dako,=20
High Wycombe,<SUP> </SUP>UK), mouse anti-vimentin (1:100; Dako), NG2 =
(1:400;=20
provided<SUP> </SUP>by W. Stallcup, The Burnham Institute, La Jolla, =
CA),=20
mouse<SUP> </SUP>anti-CC1 (1:20; Oncogene Sciences, Uniondale, NY), =
mouse=20
anti-neuronal-specific<SUP> </SUP>nuclear protein (NeuN; 1:250; =
Chemicon,=20
Temecula, CA), mouse<SUP> </SUP>anti-Map2 (1:1000; Sternberger =
Monoclonals,=20
Exeter, UK), mouse<SUP> </SUP>anti-calretinin (1:100; Chemicon), and =
rabbit=20
anti-calbindin<SUP> </SUP>(1:1000; Swant, Bellinzona, Switzerland). =
Biotinylated=20
secondary<SUP> </SUP>antibodies with avidin-conjugated fluorescein =
(1:300;=20
Vector<SUP> </SUP>Laboratories, Burlingame, CA) were used to detect GFP =
in=20
tissue<SUP> </SUP>sections from injected brains. Antigen retrieval was=20
performed<SUP> </SUP>before immunolabeling with antibodies to Zebrin II =
and=20
GFAP<SUP> </SUP>as described previously (Marshall and Goldman, 2002<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF25"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>). For terminal<SUP> </SUP>deoxynucleotidyl =
transferase-mediated=20
biotinylated UTP nick<SUP> </SUP>end labeling (TUNEL) assay, an <I>in =
situ</I>=20
cell death detection<SUP> </SUP>kit (Roche Products, Hertfordshire, UK) =
was=20
used.<SUP> </SUP>
<P><I>SVZ cell cultures and immunocytochemistry</I>. SVZs from P3 =
mice<SUP>=20
</SUP>were dissected, dissociated with a 0.025%Trypsin-EDTA/0.25 =
mg/ml<SUP>=20
</SUP>DNase solution, and filtered through a 35 =B5m Nitex mesh.<SUP>=20
</SUP>Dissociated cells were grown in neurobasal medium with 0.1%<SUP>=20
</SUP>fetal bovine serum (FBS) for 3 d. Cells were then cultured =
for<SUP>=20
</SUP>one additional day in neurobasal medium with 3% FBS to =
generate<SUP>=20
</SUP>cultures enriched for immature astrocytes and an additional<SUP> =
</SUP>5 d=20
for cultures enriched for mature astrocytes. Cell cultures<SUP> =
</SUP>were=20
labeled using the following antibodies: mouse anti-vimentin<SUP> =
</SUP>(1:400;=20
Dako), mouse anti-GFAP (1:600; Dako), and guinea pig<SUP> =
</SUP>anti-Olig2=20
(1:20,000) (Wichterle et al., 2002<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF35"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>).<SUP> </SUP>
<P><A name=3DSEC3><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/rarrow.gif"=20
      width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      Results </FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#top"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#ABS"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Abstract<BR></A><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#SEC1"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Introduction<BR></A><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#SEC2"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Materials and Methods<BR></A><IMG height=3D9 alt=3D" " =
hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      color=3D#464c53>Results</FONT><BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#SEC4"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>Discussion<BR></A><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#BIBL"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/darrow.gif" width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR><=
STRONG>Olig2=20
expression in the SVZ and RMS</STRONG><BR>We first examined the =
expression of=20
Olig2 in the neonatal rodent<SUP> </SUP>forebrain SVZ and RMS using =
antibodies=20
to Zebrin II (aldolase<SUP> </SUP>C) and the homeodomain transcription =
factor=20
Dlx2 to define two<SUP> </SUP>major SVZ cell subpopulations. Zebrin II =
is=20
specifically expressed<SUP> </SUP>by radial glia and astrocytes within =
the=20
perinatal forebrain<SUP> </SUP>and is a useful marker for these cells=20
(Staugaitis et al., 2001<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF32"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>;<SUP> </SUP>Marshall and Goldman, 2002<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF25"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>). Zebrin II expression in astrocytic<SUP> </SUP>"border =
cells"=20
identifies the limits of the perinatal SVZ, whereas<SUP> </SUP>a =
reciprocal,=20
Zebrin II negative, "central" cell population<SUP> </SUP>is defined by =
the=20
expression of Dlx2 (Marshall and Goldman,<SUP> </SUP>2002<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF25"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>). Immunohistochemical analysis of mouse forebrain =
tissue<SUP>=20
</SUP>at P0-P7 revealed that Olig2 was expressed in both SVZ border<SUP> =

</SUP>and central cells. Olig2 expression in Zebrin II+ border =
cells,<SUP>=20
</SUP>which line the ventricles as well as the dorsolateral edges<SUP> =
</SUP>of=20
the SVZ adjacent to the subcortical white matter and striatum,<SUP> =
</SUP>is=20
shown in coronal sections (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG1">Fig.=20
1<I>E-G</I></A>). Olig2 expression in<SUP> </SUP>Dlx2+ central SVZ =
cells, which=20
migrate radially into forebrain<SUP> </SUP>areas overlying the SVZ as =
well=20
rostrally into the RMS, is best<SUP> </SUP>viewed in parasagittal =
sections (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG1">Fig.=20
1<I>H-J</I></A>). We found that only<SUP> </SUP>a minority of the Dlx+ =
cells=20
also express olig2. The RMS was<SUP> </SUP>strikingly devoid of Olig2 =
expression=20
(<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG1">Fig.=20
1<I>K</I></A>), suggesting<SUP> </SUP>that Olig2 might be expressed =
specifically=20
by glia or glial<SUP> </SUP>progenitors but not by interneurons or =
migratory=20
neuronal progenitors<SUP> </SUP>in the perinatal forebrain. We also =
examined=20
cells from acutely<SUP> </SUP>dissociated P1 SVZs and found that =
expression of=20
neuronal <IMG alt=3D{beta} =
src=3D"http://www.jneurosci.org/math/beta.gif" align=3Dtop=20
border=3D0>-tubulin<SUP> </SUP>(TuJ1) and Olig2 do not overlap but, in =
sum, can=20
account for<SUP> </SUP>the large majority of cells (data not shown). If =
TuJ1 is=20
a marker<SUP> </SUP>for immature cells of the neuronal lineage, then =
Olig2 may=20
be<SUP> </SUP>expressed by glioblasts and also perhaps by multipotent=20
cells,<SUP> </SUP>if such cells exist in the neonatal SVZ.<SUP> </SUP>
<P><STRONG>Developing astrocytes and oligodendrocytes express=20
Olig2</STRONG><BR>We next used immunohistochemical labeling to examine =
the=20
expression<SUP> </SUP>of Olig2 throughout the rest of the perinatal =
forebrain=20
[embryonic<SUP> </SUP>day 18 (E18) to P10], with particular attention to =

developing<SUP> </SUP>glia. Olig2 was expressed in astrocytes as well as =

oligodendrocytes<SUP> </SUP>throughout the cortex, subcortical white =
matter, and=20
striatum.<SUP> </SUP>Because astrocytes arise from at least two sources =
within=20
the<SUP> </SUP>perinatal forebrain, ZebrinII+ radial glia, which =
transform<SUP>=20
</SUP>directly into astrocytes, and Dlx2+ migratory SVZ =
progenitors,<SUP>=20
</SUP>which colonize the forebrain and complete their =
differentiation<SUP>=20
</SUP>in the white matter and gray matter, we examined Olig2 =
expression<SUP>=20
</SUP>in both radial glia and immature astrocytes. Radial glia =
throughout<SUP>=20
</SUP>the perinatal dorsal forebrain, including those with an =
intermediate<SUP>=20
</SUP>morphology suggestive of an ongoing transformation into a =
mature<SUP>=20
</SUP>astrocyte phenotype (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG2">Fig.=20
2<I>A</I></A>, arrowheads) (Voigt, 1989<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF34"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>), expressed<SUP> </SUP>Zebrin II and Olig2. Immature =
astrocytes,=20
defined by their relatively<SUP> </SUP>simple morphology (in contrast to =
the=20
complex, bushy appearance<SUP> </SUP>of mature astrocytes) and their =
expression=20
of Zebrin II but<SUP> </SUP>not GFAP, also expressed Olig2+ (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG2">Fig.=20
2<I>B</I></A>, arrowheads). In addition,<SUP> </SUP>astrocytes that were =
more=20
differentiated and expressed detectable<SUP> </SUP>GFAP in their =
perinuclear=20
region (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG2">Fig.=20
2<I>B-D</I></A>, asterisk) as well<SUP> </SUP>as astrocytes in late =
stages of=20
maturation, which expressed<SUP> </SUP>GFAP in the perinuclear region as =
well as=20
throughout their processes<SUP> </SUP>(<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG2">Fig.=20
2<I>E-G</I></A>), were also Olig2+. Notably, the GFAP+/Olig2+ =
astrocytes<SUP>=20
</SUP>that we identified were distributed widely throughout the =
forebrain<SUP>=20
</SUP>and in the cerebral cortex, white matter, and striatum.<SUP> =
</SUP>
<P>Although most, if not all, GFAP+ astrocytes in the neonatal<SUP>=20
</SUP>forebrain expressed Olig2, mature and fully arborized =
astrocytes<SUP>=20
</SUP>expressing the highest amounts of GFAP (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG2">Fig.=20
2<I>E</I></A>, arrowheads)<SUP> </SUP>consistently appeared to express =
slightly=20
lower levels of Olig2,<SUP> </SUP>as judged by Olig2 immunoreactivity, =
than=20
astrocytes with a<SUP> </SUP>more immature morphology and expressing =
less GFAP=20
(<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG2">Fig.=20
2<I>E</I></A>,<SUP> </SUP>asterisk), suggesting a downregulation of =
Olig2 in=20
mature astrocytes.<SUP> </SUP>Immunohistochemical analysis of forebrain=20
astrocytes at various<SUP> </SUP>developmental time points, from =
neonatal=20
(P0-P7) to adult (P30),<SUP> </SUP>confirmed a gradual downregulation of =
Olig2=20
expression (R. Ventura,<SUP> </SUP>unpublished observations). Thus, =
Olig2=20
appears to be expressed<SUP> </SUP>transiently in forebrain astrocytes. =
Olig2 is=20
expressed strongly<SUP> </SUP>as astrocytes become specified and =
differentiated,=20
but it is<SUP> </SUP>subsequently downregulated after their development =
is=20
mostly<SUP> </SUP>complete. In contrast, oligodendrocytes throughout the =

forebrain,<SUP> </SUP>defined here by their expression of CNPase (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG2">Fig.=20
2<I>H,I</I></A>), expressed<SUP> </SUP>Olig2 consistently from early=20
developmental stages into adulthood<SUP> </SUP>(data not shown).<SUP> =
</SUP>
<P><SUP></SUP>
<P><A name=3DFIG1><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289/FIG1"><IMG=20
            height=3D200 alt=3D" " hspace=3D10=20
            =
src=3D"http://www.jneurosci.org/content/vol25/issue32/images/small/zns032=
0506480001.gif"=20
            width=3D107 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (43K):<BR><NOBR><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289/FIG1">[in=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG1', 385, 640); =
this.href=3D'/cgi/content-nw/full/25/32/7289/FIG1'"=20
            =
href=3D"http://www.jneurosci.org/cgi/content-nw/full/25/32/7289/FIG1"=20
            target=3DFIG1>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><STRONG><B>Figure =
1.</B></STRONG> Olig2=20
            expression in the SVZ. <B><I>A</I></B>, Diagram of coronal =
and=20
            parasagittal planes highlighting the SVZ (<B><I>B</I></B>) =
and RMS=20
            (<B><I>C</I></B>) (both green), respectively. SVZ-derived =
glial=20
            precursors migrate radially within a coronal plane into =
adjacent=20
            forebrain areas, whereas SVZ-derived neuronal progenitors =
migrate=20
            rostrally in a parasagittal plane to the olfactory bulb.=20
            <B><I>D</I></B>, Transcriptional regulators directing the =
formation=20
            of neuronal and glial lineages in SVZ cells are not known.=20
            <B><I>E-G</I></B>, Olig2 expression in Zebrin II+ (border) =
and=20
            Zebrin II- (middle) SVZ cells, as indicated by =
immunostaining of P6=20
            mouse forebrain. The inset in <B><I>E</I></B> depicts the =
area of=20
            photomicrographs shown in <B><I>E</I></B> and =
<B><I>F</I></B>. The=20
            boxed area in <B><I>F</I></B> is magnified in =
<B><I>G</I></B>.=20
            <B><I>H-J</I></B>, Olig2 is expressed in Dlx2+ (central) SVZ =

            progenitors. The inset in <B><I>H</I></B> depicts the area =
of the=20
            photomicrograph shown in <B><I>H</I></B> and =
<B><I>I</I></B>. The=20
            boxed area in <B><I>I</I></B> is magnified in =
<B><I>J</I></B>.=20
            <B><I>K</I></B>, Cells within the RMS do not express Olig2. =
lv,=20
            Lateral ventricle; wm, white matter.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>Because=20
Olig2 expression in forebrain astrocytes has not yet<SUP> </SUP>been =
documented,=20
we examined this expression further using three<SUP> </SUP>independent =
methods.=20
First, we analyzed neonatal forebrains<SUP> </SUP>from <I>hGFAP-eGFP</I> =

transgenic mice. The human GFAP promoter drives<SUP> </SUP>expression of =
GFAP at=20
very early stages of astrocyte development<SUP> </SUP>relative to the =
mouse GFAP=20
promoter. Hence, in these mice, the<SUP> </SUP>hGFAP promoter drives =
expression=20
of GFP in immature astrocytes<SUP> </SUP>(Malatesta et al., 2000<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF24"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>). Many developing astrocytes in the<SUP> </SUP>perinatal =
(P6)=20
telencephalon of <I>hGFAP-eGFP</I> transgenics coexpressed<SUP> =
</SUP>GFP and=20
Olig2 (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG2">Fig.=20
2<I>J,K</I></A>). Second, we performed a short-term<SUP> </SUP>lineage =
tracing=20
analysis of cells that had expressed Olig2 by<SUP> </SUP>examining =
forebrain=20
sections taken from Olig2-GFP knock-in mice.<SUP> </SUP>Olig2-GFP+ =
progenitors=20
appeared to give rise to all glial lineages,<SUP> </SUP>including many =
GFAP+=20
astrocytes, in the white matter and cerebral<SUP> </SUP>cortex (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG2">Fig.=20
2<I>L-N</I></A>). Third, we analyzed the expression pattern<SUP> =
</SUP>of Olig2=20
at different stages of astrocyte development <I>in vitro</I>.<SUP>=20
</SUP>Astrocytes express a predictable, sequential pattern of =
intermediate<SUP>=20
</SUP>filaments during their differentiation. Immature astrocytes<SUP>=20
</SUP>express vimentin (Dahl et al., 1981<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF7"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>), whereas the additional<SUP> </SUP>expression of GFAP =
(Chiu et=20
al., 1981<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF6"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>) is often used as an indicator<SUP> </SUP>of maturation. =
SVZ=20
progenitors, harvested at P3, were cultured<SUP> </SUP>for 4 d in=20
astrocyte-supporting conditions to generate immature<SUP> =
</SUP>astrocytes. Most=20
cells coexpressed vimentin and Olig2 after<SUP> </SUP>4 d <I>in =
vitro</I> (div)=20
(<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG2">Fig.=20
2<I>O</I></A>). These cells did not express immunodetectable<SUP> =
</SUP>levels=20
of GFAP. In contrast, older astrocyte cultures at 8 div<SUP> </SUP>were=20
comprised of more mature, GFAP+ cells. However, few of<SUP> </SUP>these=20
astrocytes coexpressed Olig2 strongly (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG2">Fig.=20
2<I>P</I></A>), pointing<SUP> </SUP>again to a downregulation of Olig2 =
in mature=20
astrocytes. These<SUP> </SUP>findings support results from previous =
studies in=20
which Olig2<SUP> </SUP>expression was positively correlated with an =
immature=20
astrocyte<SUP> </SUP>phenotype but negatively correlated with a mature=20
astrocyte<SUP> </SUP>phenotype in neural progenitor cell cultures =
(Fukuda et=20
al.,<SUP> </SUP>2003<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF11"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>; Gabay et al., 2003<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF12"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>). A summary of Olig2 expression with<SUP> </SUP>respect =
to glial=20
cell lineages in the postnatal forebrain is<SUP> </SUP>depicted in <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG2">Figure=20
2<I>Q</I></A>.<SUP> </SUP>
<P><SUP></SUP>
<P><A name=3DFIG2><!-- null --></A><BR clear=3Dall>
<CENTER>
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          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289/FIG2"><IMG=20
            height=3D200 alt=3D" " hspace=3D10=20
            =
src=3D"http://www.jneurosci.org/content/vol25/issue32/images/small/zns032=
0506480002.gif"=20
            width=3D145 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (84K):<BR><NOBR><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289/FIG2">[in=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG2', 468, 640); =
this.href=3D'/cgi/content-nw/full/25/32/7289/FIG2'"=20
            =
href=3D"http://www.jneurosci.org/cgi/content-nw/full/25/32/7289/FIG2"=20
            target=3DFIG2>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><STRONG><B>Figure =
2.</B></STRONG>=20
            Developing astrocytes and oligodendrocytes express Olig2.=20
            <B><I>A</I></B>, Cortical radial glia with an intermediate=20
            morphology (arrowheads), indicative of a transformation into =

            astrocytes, express Zebrin II and Olig2 (P3, coronal section =
through=20
            murine cerebral cortex). <B><I>B-D</I></B>, Olig2 and Zebrin =
II are=20
            expressed robustly in developing astrocytes (P6, murine =
cerebral=20
            cortex) at early stages of differentiation before GFAP =
expression=20
            (<B><I>B</I></B>, arrowheads) and at later stages as GFAP is =

            upregulated (<B><I>B</I></B>, asterisk). The cell marked =
with an=20
            asterisk in <B><I>B</I></B> is magnified to show perinuclear =
GFAP=20
            (<B><I>C</I></B>) and Zebrin II (<B><I>D</I></B>) =
immunolabeling=20
            with respect to nuclear Olig2 expression. <B><I>E-G</I></B>, =
Mature=20
            and fully arborized astrocytes (P6, murine cerebral cortex)=20
            expressing high amounts of GFAP and Zebrin II =
(<B><I>E</I></B>,=20
            arrowheads) consistently appeared to express lower levels of =
Olig2=20
            than astrocytes with immature morphologies that express less =
GFAP=20
            (<B><I>E</I></B>, asterisk). <B><I>H</I></B>, =
<B><I>I</I></B>,=20
            CNPase+/Olig2+ oligodendrocytes in parasagittal sections of =
P6 mouse=20
            forebrain. <B><I>J</I></B>, <B><I>K</I></B>, Developing =
astrocytes=20
            in the <I>hGFAP-GFP</I> mouse (P7) forebrain coexpress GFP =
and=20
            Olig2. <B><I>L</I></B>, <B><I>M</I></B>, Astrocytes in the=20
            <I>mOlig2-I-eGFP</I> mouse forebrain (P6, cortex) coexpress =
GFAP,=20
            GFP, and Olig2. <B><I>O</I></B>, Cell cultures generated =
from P3=20
            mouse SVZ contained many vimentin+/Olig2+, immature =
astrocytes after=20
            4 div. <B><I>P</I></B>, After 8 div, cultures were mostly =
comprised=20
            of mature, GFAP+ astrocytes. Olig2 immunoreactivity in these =
mature=20
            astrocytes was markedly reduced. <B><I>Q</I></B>, Summary of =
Olig2=20
            expression with respect to glial cell lineages in the =
postnatal=20
            forebrain.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><STRONG>Olig2=20
is expressed exclusively by SVZ-derived glia</STRONG><BR>SVZ progenitors =

generate interneurons, astrocytes, and oligodendrocytes<SUP> =
</SUP>during the=20
perinatal period. Those cells specified to become<SUP> </SUP>glia =
migrate=20
radially into the cerebral cortex, subcortical<SUP> </SUP>white matter, =
and=20
striatum, whereas those specified to become<SUP> </SUP>interneurons =
migrate=20
rostrally, via the RMS, to the olfactory<SUP> </SUP>bulb. As noted =
above,=20
astrocytes and oligodendrocytes in the<SUP> </SUP>forebrain expressed =
Olig2,=20
whereas cells in the RMS did not.<SUP> </SUP>Furthermore, a short-term =
lineage=20
analysis using Olig2-GFP knock-in<SUP> </SUP>mice revealed GFP =
expression in=20
postnatal forebrain glia but<SUP> </SUP>not olfactory interneurons. To =
determine=20
definitively which<SUP> </SUP>SVZ-derived cells express Olig2, we =
transduced SVZ=20
cells <I>in<SUP> </SUP>vivo</I> with GFP using a replication-incompetent =

retrovirus encoding<SUP> </SUP><I>GFP</I> (<I>X-ires-eGFP</I>) and =
analyzed=20
infected cells at several time<SUP> </SUP>points. A virus was injected=20
unilaterally into the SVZ of neonatal<SUP> </SUP>rat pups (P2/P3) at the =
rostral=20
aspect of the SVZ, in which<SUP> </SUP>the RMS diverges from the SVZ (<A =

href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG3">Fig.=20
3<I>F</I></A>, arrow), using a stereotax.<SUP> </SUP>Infected cells were =

examined at 2 and 4 d postinjection (dpi)<SUP> </SUP>in coronal (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG3">Fig.=20
3<I>A-C</I></A>) and parasagittal (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG3">Fig.=20
3<I>D-I</I></A>) sections.<SUP> </SUP>The distribution and phenotypes of =
GFP+=20
cells in the olfactory<SUP> </SUP>bulb, RMS, SVZ, white matter, and =
cortex (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG3">Fig.=20
3<I>F</I></A>) were similar<SUP> </SUP>to those observed previously =
(Suzuki and=20
Goldman, 2003<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF33"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>). At<SUP> </SUP>2 dpi, most infected cells were found =
within the=20
SVZ, whereas<SUP> </SUP>only a few had migrated into the overlying white =
matter=20
(<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG2">Fig.<SUP>=20
</SUP>2<I>A</I></A>). By 4 dpi, infected cells colonized the white =
matter,=20
cortex,<SUP> </SUP>striatum, RMS, and olfactory bulb. Many of the =
infected=20
SVZ<SUP> </SUP>cells that had migrated radially into the white matter,=20
striatum,<SUP> </SUP>and cortex were GFP+/Olig2+ and exhibited =
morphologic=20
characteristics<SUP> </SUP>of oligodendrocytes (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG3">Fig.=20
3<I>B</I></A>) as well as immature astrocytes<SUP> </SUP>(<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG3">Fig.=20
3<I>C</I></A>; the asterisk marks a blood vessel associated with<SUP> =
</SUP>the=20
astrocyte). In contrast, GFP+ cells migrating in the RMS<SUP> </SUP>(<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG3">Fig.=20
3<I>D-F</I></A>) or colonizing the olfactory bulb (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG3">Fig.=20
3<I>G-I</I></A>) did<SUP> </SUP>not express Olig2. Interestingly, Olig2+ =
cells=20
lining the RMS<SUP> </SUP>(<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG1">Fig.=20
1<I>K</I></A>) are closely adjacent to Olig2- migratory neuroblasts<SUP> =

</SUP>(<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG3">Fig.=20
3<I>E</I></A>) and perhaps comprise part of the astrocyte =
population<SUP>=20
</SUP>that encapsulates neuroblasts within the RMS (Doetsch et al.,<SUP> =

</SUP>1997<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF8"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>).<SUP> </SUP>
<P><SUP></SUP>
<P><A name=3DFIG3><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289/FIG3"><IMG=20
            height=3D200 alt=3D" " hspace=3D10=20
            =
src=3D"http://www.jneurosci.org/content/vol25/issue32/images/small/zns032=
0506480003.gif"=20
            width=3D103 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (68K):<BR><NOBR><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289/FIG3">[in=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG3', 376, 640); =
this.href=3D'/cgi/content-nw/full/25/32/7289/FIG3'"=20
            =
href=3D"http://www.jneurosci.org/cgi/content-nw/full/25/32/7289/FIG3"=20
            target=3DFIG3>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><STRONG><B>Figure =
3.</B></STRONG> Olig2 is=20
            expressed exclusively by SVZ-derived glia. <B><I>A</I></B>, =
GFP=20
            expression 2 d after stereotactic injection of =
replication-deficient=20
            retrovirus (<I>pNIT-eGFP</I>) into P2/P3 rat SVZ. See=20
            <B><I>F</I></B> for the site of injection and distribution =
of=20
            infected cells at 4 dpi. <B><I>B</I></B>, <B><I>C</I></B>, =
At 4 dpi,=20
            GFP+/Olig2+ cells with oligodendrocyte (<B><I>B</I></B>) and =

            astrocyte (<B><I>C</I></B>) morphologies were observed in =
the=20
            parenchyma (the asterisk in <B><I>C</I></B> indicates a =
blood vessel=20
            enwrapped by an astrocyte). <B><I>D</I></B>, =
<B><I>E</I></B>,=20
            SVZ-derived neuroblasts do not express Olig2 as they migrate =
in the=20
            RMS, which is outlined for clarity. The boxed area is =
magnified in=20
            <B><I>E</I></B>. <B><I>F</I></B>, Distribution of SVZ cells=20
            transduced with GFP. The red box indicates the area of the=20
            photomicrograph in <B><I>D</I></B>. <B><I>G-I</I></B>, =
SVZ-derived=20
            interneuronal precursors remain Olig2-within the olfactory =
bulb. The=20
            boxed area in <B><I>G</I></B> is magnified in =
<B><I>H</I></B>.=20
            <B><I>I</I></B>, The red box indicates the area of the=20
            photomicrograph in <B><I>G</I></B>. lv, Lateral ventricle; =
wm, white=20
            matter; str, striatum.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>In=20
summary, SVZ cells that became specified to a gliogenic lineage<SUP> =
</SUP>and=20
migrated radially into the parenchyma expressed Olig2. In<SUP> =
</SUP>contrast,=20
SVZ cells specified to an olfactory interneuron lineage<SUP> </SUP>that =
migrated=20
rostrally via the RMS and differentiated in the<SUP> </SUP>olfactory =
bulb did=20
not express Olig2. These findings demonstrated<SUP> </SUP>an intriguing=20
correlation between Olig2 expression and glial<SUP> </SUP>fates, raising =
the=20
possibility that Olig2 transcriptional regulatory<SUP> </SUP>function =
may direct=20
the specification of glial versus neuronal<SUP> </SUP>lineages in SVZ=20
progenitors.<SUP> </SUP>
<P><STRONG>SVZ progenitors transduced with Olig2 differentiate =
exclusively into=20
glia</STRONG><BR>To examine the potential functions of Olig2 in =
directing=20
SVZ<SUP> </SUP>progenitors to glial lineages, we transduced SVZ cells =
with<SUP>=20
</SUP>a bicistronic retrovirus encoding <I>Olig2</I> and <I>eGFP</I>=20
(<I>Olig2-ires-eGFP</I>)<SUP> </SUP>or a control virus encoding =
<I>eGFP</I>=20
alone (<I>X-ires-eGFP</I>). All experiments<SUP> </SUP>were performed =
using the=20
same retroviral vector (pQCXIX), protein<SUP> </SUP>coat (VSV-G), and=20
stereotaxic coordinates.<SUP> </SUP>
<P>Retrovirus was injected into neonatal rats as described above,<SUP> =
</SUP>and=20
brains (<I>n</I> =3D 8) were harvested at 4 and 8 dpi. Olig2 =
expression<SUP>=20
</SUP>in SVZ cells appeared to prevent the migration and =
differentiation<SUP>=20
</SUP>of olfactory interneurons, because no infected cells were =
observed<SUP>=20
</SUP>in the distal RMS or olfactory bulb (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG4">Fig.=20
4<I>C</I></A>). Immunohistochemistry<SUP> </SUP>using horseradish =
peroxidase and=20
diaminobenzidine precipitation<SUP> </SUP>was performed to ensure that =
cells=20
expressing low levels of<SUP> </SUP>GFP, and thus undetectable by=20
immunofluorescence, were evaluated.<SUP> </SUP>This more sensitive =
analysis did=20
not reveal any labeled cells<SUP> </SUP>in the RMS or olfactory bulb =
(data not=20
shown). Instead, the<SUP> </SUP>large majority (<IMG alt=3D~=20
src=3D"http://www.jneurosci.org/math/sim.gif" border=3D0>88%) of cells =
misexpressing=20
Olig2 migrated radially<SUP> </SUP>from the SVZ into the white matter =
and=20
cerebral cortex, areas<SUP> </SUP>typically colonized by glia (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG4">Fig.=20
4<I>C</I></A>). Others (<IMG alt=3D~ =
src=3D"http://www.jneurosci.org/math/sim.gif"=20
border=3D0>12%) differentiated<SUP> </SUP>within the SVZ/proximal RMS =
(<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG4">Fig.=20
4<I>A-D</I></A>) before their migration.<SUP> </SUP>We did not observe=20
differentiated cells within the SVZ or RMS<SUP> </SUP>in brains injected =
with=20
our control virus; this premature differentiation<SUP> </SUP>is not a =
behavior=20
typical of SVZ cells (Suzuki and Goldman,<SUP> </SUP>2003<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF33"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>).<SUP> </SUP>
<P>To quantitate the relative distributions of infected cells,<SUP> =
</SUP>a=20
sampling of three comparable parasagittal sections was taken<SUP> =
</SUP>from=20
five brains misexpressing Olig2 and three brains expressing<SUP> =
</SUP>the=20
control vector at 4 dpi. Selected sections contained the<SUP> =
</SUP>injection=20
site and the entire RMS. Cells infected with the <I>X-ires-eGFP</I><SUP> =

</SUP>control virus (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG5">Fig.=20
5<I>A</I></A>) migrated radially into the white matter,<SUP> =
</SUP>striatum, and=20
all layers of the cerebral cortex as well as rostrally<SUP> </SUP>into =
the RMS=20
and olfactory bulb (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG5">Fig.=20
5<I>B</I></A>). In these control<SUP> </SUP>parasagittal sections, 51% =
of the=20
cells were found in the olfactory<SUP> </SUP>bulb, and 27% were found in =
the=20
RMS. In contrast, the majority<SUP> </SUP>of cells misexpressing=20
<I>Olig2-ires-eGFP</I> (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG5">Fig.=20
5<I>C</I></A>) migrated into<SUP> </SUP>the white matter (51%) and all =
layers of=20
the cerebral cortex<SUP> </SUP>(37%); 12% were found in the proximal =
RMS, but no=20
cells were<SUP> </SUP>identified in the distal RMS or olfactory bulb (<A =

href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG5">Fig.=20
5<I>D</I></A>). Infected<SUP> </SUP>brains were cut along a parasagittal =
plane,=20
enabling us to analyze<SUP> </SUP>the rostral versus radial migration of =
SVZ=20
cells within each<SUP> </SUP>section. Our quantitative distributions (<A =

href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG5">Fig.=20
5<I>B,D</I></A>) represent<SUP> </SUP>cells solely within this =
parasagittal=20
plane, however, and do<SUP> </SUP>not predict the distribution of =
labeled cells=20
throughout the<SUP> </SUP>entire brain. Because many SVZ-derived glia =
migrate to=20
dorsolateral<SUP> </SUP>areas of the forebrain, these cells are not =
represented=20
in our<SUP> </SUP>quantitations.<SUP> </SUP>
<P><SUP></SUP>
<P><A name=3DFIG4><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289/FIG4"><IMG=20
            height=3D200 alt=3D" " hspace=3D10=20
            =
src=3D"http://www.jneurosci.org/content/vol25/issue32/images/small/zns032=
0506480004.gif"=20
            width=3D98 vspace=3D5 border=3D2></A><BR><STRONG>View larger =

            version</STRONG> (57K):<BR><NOBR><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289/FIG4">[in=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG4', 366, 640); =
this.href=3D'/cgi/content-nw/full/25/32/7289/FIG4'"=20
            =
href=3D"http://www.jneurosci.org/cgi/content-nw/full/25/32/7289/FIG4"=20
            target=3DFIG4>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><STRONG><B>Figure =
4.</B></STRONG> SVZ=20
            progenitors transduced with Olig2 differentiate exclusively =
into=20
            astrocytes and oligodendrocytes. <B><I>A-C</I></B>, =
Parasagittal=20
            section of rat forebrain at 4 dpi, showing cells transduced =
with=20
            <I>Olig2-ires-eGFP</I>. The boxed area in <B><I>A</I></B> is =

            magnified in <B><I>B</I></B>, highlighting differentiated =
glial=20
            cells within the SVZ/RMS. <B><I>C</I></B>, Distribution of =
cells=20
            expressing <I>Olig2-ires-eGFP</I> at 4 dpi. Thered box =
indicates the=20
            area of SVZ and proximal RMS shown in <B><I>A</I></B>.=20
            <B><I>D</I></B>, Infected cells differentiated ectopically =
in the=20
            SVZ, adjacent to the lateral ventricles. <B><I>E-K</I></B>, =
More=20
            than 70% of infected cells exhibited the morphology of=20
            oligodendrocytes (<B><I>E</I></B>) and expressed the=20
            oligodendrocyte-specific markers NG2 (<B><I>F-H</I></B>) and =
CC1=20
            (<B><I>I-K</I></B>). <B><I>L-N</I></B>, Approximately 20% of =

            infected cells exhibited astrocyte morphologies and =
expressed GFAP=20
            (asterisk). lv, Lateral ventricle; wm, white matter; str, =
striatum.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><SUP></SUP>
<P><A name=3DFIG5><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289/FIG5"><IMG=20
            height=3D200 alt=3D" " hspace=3D10=20
            =
src=3D"http://www.jneurosci.org/content/vol25/issue32/images/small/zns032=
0506480005.gif"=20
            width=3D90 vspace=3D5 border=3D2></A><BR><STRONG>View larger =

            version</STRONG> (13K):<BR><NOBR><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289/FIG5">[in=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG5', 348, 640); =
this.href=3D'/cgi/content-nw/full/25/32/7289/FIG5'"=20
            =
href=3D"http://www.jneurosci.org/cgi/content-nw/full/25/32/7289/FIG5"=20
            target=3DFIG5>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><STRONG><B>Figure =
5.</B></STRONG>=20
            Distribution of SVZ cells expressing <I>X-ires-eGFP</I> and=20
            <I>Olig2-ires-eGFP</I>. <B><I>A-D</I></B>, Retroviral =
constructs=20
            used to transduce SVZ cells with GFP (<B><I>A</I></B>) or =
Olig2-GFP=20
            (<B><I>C</I></B>) and quantified distributions of cells=20
            misexpressing GFP (<B><I>B</I></B>) or Olig2-ires-GFP=20
            (<B><I>D</I></B>), presented as a percentage of infected =
cells per=20
            brain located in each area (mean =B1 SEM). OB, Olfactory =
bulb; WM,=20
            white matter; CTX, cerebral cortex.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>The=20
skewed, radial distribution of cells misexpressing Olig2<SUP> =
</SUP>suggests a=20
redirection of cells migrating rostrally from the<SUP> </SUP>SVZ/RMS to =
areas=20
normally colonized by SVZ-derived glia. It<SUP> </SUP>is unlikely that a =

difference in viral titer or apoptosis is<SUP> </SUP>responsible for the =

cellular distributions or phenotypes we<SUP> </SUP>observed. All viruses =
were=20
titered to 1-3 <FONT face=3Darial,helvetica>x</FONT> 10<SUP>5</SUP> =
cfu/ml.=20
Furthermore,<SUP> </SUP>the numbers of infected cells were consistent =
across=20
experiments.<SUP> </SUP>In brains harvested at 4 dpi, an average of 66.3 =
cells=20
infected<SUP> </SUP>with <I>Olig2-ires-eGFP</I> and 77 cells infected =
with the=20
<I>X-ires-eGFP</I><SUP> </SUP>control were observed per section. =
Furthermore,=20
our findings<SUP> </SUP>do not appear to be the result of apoptosis. Few =

infected cells<SUP> </SUP>contained TUNEL+ nuclei in brains injected =
with either=20
the <I>X-ires-eGFP</I><SUP> </SUP>control (&lt;5%) (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG5">Fig.=20
5<I>B</I></A>) or <I>Olig2-ires-eGFP</I> (&lt;10%) (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG5">Fig.<SUP>=20
</SUP>5<I>D</I></A>); therefore, Olig2 misexpression did not selectively =

kill<SUP> </SUP>all SVZ cells destined to become olfactory interneurons. =

Rather,<SUP> </SUP>the neuroblasts, glioblasts, and progenitors that =
were=20
infected<SUP> </SUP>with <I>Olig2-ires-GFP</I> appeared to differentiate =

unilaterally along<SUP> </SUP>a glial lineage. Over 70% of infected =
cells=20
exhibited morphologies<SUP> </SUP>typical of lacy (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG4">Fig.=20
4<I>E</I></A>) or myelinating oligodendrocytes and<SUP> </SUP>expressed =
NG2 (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG4">Fig.=20
4<I>F-H</I></A>) or CC1 (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG4">Fig.=20
4<I>I-K</I></A>), whereas 20% had<SUP> </SUP>the morphology of =
astrocytes and=20
expressed GFAP (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG4">Fig.=20
4<I>L-N</I></A>).<SUP> </SUP>Approximately 10% of the infected cells =
appeared to=20
exhibit<SUP> </SUP>glial morphologies but did not express =
oligodendrocytic=20
(NG2,<SUP> </SUP>CC1), astrocytic (GFAP), or neuronal [NeuN,=20
microtubule-associated<SUP> </SUP>protein 2 (MAP2)] markers. In control=20
experiments, the same<SUP> </SUP>relative percentage of oligodendrocytes =
(70%)=20
and astrocytes<SUP> </SUP>(30%) were generated by perinatal SVZ cells =
that=20
emigrated into<SUP> </SUP>the white matter and cortex (Levison and =
Goldman,=20
1993<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF17"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>). Notably,<SUP> </SUP><I>Olig2-ires-eGFP</I>+ cells that =
expressed=20
GFAP (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG4">Fig.=20
4<I>L-N</I></A>) exhibited<SUP> </SUP>an immature astrocytic morphology =
with=20
limited arborization,<SUP> </SUP>suggesting that constitutive Olig2 =
expression=20
inhibited complete<SUP> </SUP>astrocyte maturation. In contrast, brains =
infected=20
with control<SUP> </SUP>virus contained many GFP+/GFAP+ fully mature =
astrocytes=20
and<SUP> </SUP>olfactory interneurons, as described previously (Levison =
et<SUP>=20
</SUP>al., 1993; Luskin et al., 1993<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF23"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>; Suzuki and Goldman, 2003<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF33"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>).<SUP> </SUP>
<P><SUP></SUP>
<P><A name=3DFIG6><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289/FIG6"><IMG=20
            height=3D181 alt=3D" " hspace=3D10=20
            =
src=3D"http://www.jneurosci.org/content/vol25/issue32/images/small/zns032=
0506480006.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (101K):<BR><NOBR><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289/FIG6">[in=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG6', 590, 598); =
this.href=3D'/cgi/content-nw/full/25/32/7289/FIG6'"=20
            =
href=3D"http://www.jneurosci.org/cgi/content-nw/full/25/32/7289/FIG6"=20
            target=3DFIG6>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><STRONG><B>Figure =
6.</B></STRONG> A=20
            dominant-interfering form of Olig2 blocks glial =
differentiation.=20
            <B><I>A</I></B>, <B><I>B</I></B>, SVZ cells misexpressing =
<I>Olig2=20
            bHLH</I> exhibited normal migration to the olfactory bulb =
via the=20
            RMS (<B><I>A</I></B>), which is outlined for clarity. The=20
            distribution of total infected cells at 4 dpi is shown in=20
            <B><I>B</I></B>. The red box indicates the area of RMS =
pictured=20
            (<B><I>A</I></B>). Infected cells also colonized the white =
matter=20
            and cerebral cortex, but glial differentiation was blocked =
in=20
            &gt;90% of cells (data not shown). <B><I>C-E</I></B>, =
However, <IMG=20
            alt=3D~ src=3D"http://www.jneurosci.org/math/sim.gif" =
border=3D0>25% of=20
            infected cells in the white matter and cortex ectopically =
expressed=20
            the neuronal marker NeuN, suggesting a potential =
respecification=20
            along a neuronal lineage. wm, White matter.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>In=20
summary, the expression of Olig2 in neonatal SVZ cells is<SUP> =
</SUP>sufficient=20
to direct glial versus neuronal identities, perhaps<SUP> =
</SUP>prematurely in=20
some cells. Because no infected cells expressed<SUP> </SUP>either the =
neuronal=20
marker NeuN or MAP2, our findings suggest<SUP> </SUP>that constitutive=20
expression of Olig2 directs SVZ progenitors<SUP> </SUP>to migrate =
radially, away=20
from the SVZ/RMS, and differentiate<SUP> </SUP>into glia at the expense =
of=20
interneurons. Apoptotic indices<SUP> </SUP>do not appear to account for =
the=20
differences in distributions<SUP> </SUP>of infected cells. However, =
rapid cell=20
death of neuroblasts<SUP> </SUP>misexpressing Olig2 might not have been=20
observed.<SUP> </SUP>
<P><STRONG>A dominant-interfering form of Olig2 blocks glial=20
differentiation</STRONG><BR>Because Olig2 expression appeared to specify =
SVZ=20
cells toward<SUP> </SUP>glial lineages, we examined the consequences of =
a loss=20
of Olig2<SUP> </SUP>activity. Olig2 influences cell identity through its =

ability<SUP> </SUP>to bind DNA and repress target gene expression =
(Novitch et=20
al.,<SUP> </SUP>2001<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF29"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>; Zhou et al., 2002). We reasoned that misexpression =
of<SUP>=20
</SUP>the Olig2 bHLH DNA binding domain alone might interfere with<SUP>=20
</SUP>the repressor function of endogenous Olig2. SVZ cells were =
therefore<SUP>=20
</SUP>transduced with an Olig2 construct containing the bHLH domain<SUP> =

</SUP>alone (<I>Olig2bHLH-ires-eGFP</I>) (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG6">Fig.=20
6</A>), as described above.<SUP> </SUP>
<P>In all brains examined (4 and 8 dpi; <I>n</I> =3D 8), cells =
expressing<SUP>=20
</SUP><I>Olig2bHLH-ires-eGFP</I> migrated into the RMS, olfactory bulb,=20
white<SUP> </SUP>matter, and cortex (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG6">Fig.=20
6<I>B</I></A>). However, glial differentiation<SUP> </SUP>was profoundly =

disrupted. Infected cells that migrated radially<SUP> </SUP>exhibited a =
normal=20
but immature, unipolar or bipolar morphology.<SUP> </SUP>Few =
differentiated=20
GFAP+ astrocytes (&lt;5% per brain) and CC1+<SUP> </SUP>oligodendrocytes =

(&lt;5%) were observed, and those that were<SUP> </SUP>seen were found=20
exclusively in the white matter (data not shown).<SUP> =
</SUP>Furthermore, <IMG=20
alt=3D~ src=3D"http://www.jneurosci.org/math/sim.gif" border=3D0>5% of =
infected cells=20
in the white matter and cortex<SUP> </SUP>retained Dlx2 expression, =
which was=20
downregulated completely<SUP> </SUP>by SVZ-derived glia at the same time =
points=20
in control experiments.<SUP> </SUP>In contrast, interneuron migration =
and=20
differentiation did not<SUP> </SUP>appear to be affected by expression =
of the=20
<I>Olig2bHLH-ires-eGFP</I><SUP> </SUP>construct. Many infected cells =
(40%)=20
migrated rostrally into<SUP> </SUP>the RMS (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG6">Fig.=20
6<I>A,B</I></A>) and olfactory bulb, where they differentiated<SUP>=20
</SUP>normally (data not shown). We infer from these results that<SUP>=20
</SUP>Olig2 serves a required function in both astrocyte as well as<SUP> =

</SUP>oligodendrocyte formation but is not necessary for =
interneuron<SUP>=20
</SUP>development in SVZ cells.<SUP> </SUP>
<P>Although <I>Olig2bHLH-ires-eGFP</I>+ cells colonized the white =
matter<SUP>=20
</SUP>and cerebral cortex, <IMG alt=3D~=20
src=3D"http://www.jneurosci.org/math/sim.gif" border=3D0>25% of these =
infected cells=20
ectopically<SUP> </SUP>expressed the neuronal marker NeuN (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG6">Fig.=20
6<I>C-E</I></A>). This was never<SUP> </SUP>observed in brains injected =
with the=20
<I>X-ires-eGFP</I> control virus<SUP> </SUP>and is not a behavior =
typical of=20
SVZ-derived cells (Suzuki and<SUP> </SUP>Goldman, 2003<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF33"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>), suggesting that disruption of Olig2 function<SUP> =
</SUP>may=20
cause cells in these normally gliogenic regions to adopt<SUP> =
</SUP>neuronal=20
fates. We surmise that the appearance of cells with<SUP> </SUP>neuronal=20
characteristics in the white matter and cerebral cortex<SUP> </SUP>most =
likely=20
results from SVZ progenitors in which the onset<SUP> </SUP>of Olig2 bHLH =
domain=20
expression had occurred at the time of<SUP> </SUP>or shortly after these =

progenitors had begun their radial migration,<SUP> </SUP>and thus too =
late for=20
these cells to enter the RMS. In addition<SUP> </SUP>to these aberrantly =

positioned neurons, we found that <IMG alt=3D~=20
src=3D"http://www.jneurosci.org/math/sim.gif" border=3D0>30% of<SUP>=20
</SUP><I>Olig2bHLH-ires-eGFP</I> infected cells in each brain lacked=20
processes<SUP> </SUP>and had TUNEL+ nuclei. A likely possibility is that =
cells=20
that<SUP> </SUP>become respecified to a neuronal fate ectopically may =
not=20
receive<SUP> </SUP>appropriate environmental trophic support, leading to =

their<SUP> </SUP>premature death.<SUP> </SUP>
<P>In summary, ectopic expression of a competitor form of Olig2<SUP>=20
</SUP>prevented both astrocyte and oligodendrocyte differentiation<SUP> =
</SUP>in=20
&gt;90% of infected SVZ cells. However, expression of the<SUP> =
</SUP>truncated=20
Olig2 did not interfere with the specification of<SUP> </SUP>neuroblasts =
or=20
their migration to the olfactory bulb. Cells<SUP> </SUP>that migrated =
radially=20
into the developing forebrain either<SUP> </SUP>remained =
undifferentiated or=20
began to differentiate ectopically<SUP> </SUP>along a neuronal lineage.=20
Together, these results strongly support<SUP> </SUP>a requirement for =
Olig2=20
during SVZ progenitor specification<SUP> </SUP>to a glial fate.<SUP> =
</SUP>
<P><STRONG>An antimorphic activator form of Olig2 promotes neurogenesis =
in SVZ=20
cells</STRONG><BR>To confirm that Olig2 repressor activity is required =
for=20
SVZ<SUP> </SUP>progenitor specification to glial fates, we used a=20
dominant-activator<SUP> </SUP>form of Olig2 to reverse endogenous Olig2=20
repressor function.<SUP> </SUP>A retrovirus encoding the Olig2 bHLH =
subdomains=20
fused to a herpes<SUP> </SUP>simplex VP16 activator domain was generated =

(<I>Olig2bHLH/VP16-ires-eGFP</I>)<SUP> </SUP>(<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG7">Fig.=20
7</A>), and injections were performed as described.<SUP> </SUP>
<P>Infected cells from brains harvested at 4 and 8 dpi (<I>n</I> =3D =
9)<SUP>=20
</SUP>were examined. Infected cells either remained within the SVZ<SUP> =
</SUP>or=20
migrated a short distance into the overlying white matter,<SUP> =
</SUP>layer 6,=20
or proximal RMS (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG7">Fig.=20
7<I>A-C</I></A>). No infected cells exhibited<SUP> </SUP>glial =
morphologies or=20
expressed the glial markers vimentin,<SUP> </SUP>GFAP, CC1, or NG2. =
Rather,=20
cells expressing the antimorph appeared<SUP> </SUP>to differentiate =
prematurely=20
into interneurons. Strikingly,<SUP> </SUP>&gt;75% of infected cells =
positioned=20
within the SVZ, proximal<SUP> </SUP>descending arm of the RMS, white =
matter, and=20
cortex, expressed<SUP> </SUP>the neuronal markers MAP2 (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG7">Fig.=20
7<I>D-F</I></A>) or NeuN (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG7">Fig.=20
7<I>G-I</I></A>). Furthermore,<SUP> </SUP><IMG alt=3D~=20
src=3D"http://www.jneurosci.org/math/sim.gif" border=3D0>30% of infected =
cells also=20
expressed markers specific to interneurons,<SUP> </SUP>such as calbindin =
(<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG7">Fig.=20
7<I>J-L</I></A>) or calretinin (<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG7">Fig.=20
7<I>M-O</I></A>) but<SUP> </SUP>exhibited relatively immature neuronal=20
morphologies. Thus, expression<SUP> </SUP>of the dominant-activator form =
of=20
Olig2 appeared to elicit an<SUP> </SUP>aberrant and premature program of =

neuronal differentiation.<SUP> </SUP>As in the case of the bHLH =
domain-alone=20
construct, misexpression<SUP> </SUP>of the activator form of Olig2 led =
to a=20
significant amount of<SUP> </SUP>apoptosis, <IMG alt=3D~=20
src=3D"http://www.jneurosci.org/math/sim.gif" border=3D0>50% of the =
infected cell=20
population. Together, these<SUP> </SUP>findings provide evidence that =
Olig2=20
repressor function is required<SUP> </SUP>to prevent neuronal =
differentiation=20
and to direct both astrocytic<SUP> </SUP>and oligodendrocytic fates in =
postnatal=20
SVZ progenitors.<SUP> </SUP>
<P><SUP></SUP>
<P><A name=3DFIG7><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289/FIG7"><IMG=20
            height=3D200 alt=3D" " hspace=3D10=20
            =
src=3D"http://www.jneurosci.org/content/vol25/issue32/images/small/zns032=
0506480007.gif"=20
            width=3D100 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (54K):<BR><NOBR><A=20
            =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289/FIG7">[in=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG7', 371, 640); =
this.href=3D'/cgi/content-nw/full/25/32/7289/FIG7'"=20
            =
href=3D"http://www.jneurosci.org/cgi/content-nw/full/25/32/7289/FIG7"=20
            target=3DFIG7>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><STRONG><B>Figure =
7.</B></STRONG> An=20
            antimorphic activator form of Olig2 promotes neurogenesis in =
SVZ=20
            cells. <B><I>A-C</I></B>, Expression of an =
<I>Olig2bHLH-VP16</I>=20
            activator fusion construct limited the migration of SVZ =
cells. Cells=20
            migrated short distances into the proximal RMS, white =
matter, and=20
            layer 6 of the cerebral cortex. The boxed area in =
<B><I>A</I></B>,=20
            containing infected SVZ cells, is magnified in =
<B><I>B</I></B>. The=20
            distribution of infected cells is shown in <B><I>C</I></B>.=20
            <B><I>D-I</I></B>, More than 75% of infected cells expressed =
the=20
            neuronal markers Map2 (<B><I>D-F</I></B>) and NeuN=20
            (<B><I>G-I</I></B>). <B><I>J-O</I></B>, Approximately 30% of =
cells=20
            in the white matter and SVZ/RMS expressed =
interneuron-specific=20
            markers such as calbindin (<B><I>J-L</I></B>) and calretinin =

            (<B><I>M-O</I></B>). WM/VI, White matter/layer 6 border; LV, =
lateral=20
            ventricle.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><A=20
name=3DSEC4><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/rarrow.gif"=20
      width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      Discussion </FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#top"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#ABS"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Abstract<BR></A><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#SEC1"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Introduction<BR></A><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#SEC2"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Materials and Methods<BR></A><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#SEC3"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Results<BR></A><IMG height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      color=3D#464c53>Discussion</FONT><BR><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#BIBL"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/darrow.gif" width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>W=
e provide=20
evidence that Olig2 specifies SVZ cells to pan-glial<SUP> </SUP>versus =
neuronal=20
lineages. By repressing a neuronal phenotype<SUP> </SUP>in SVZ =
progenitors,=20
Olig2 expression permits the production<SUP> </SUP>of astrocyte and=20
oligodendrocyte precursors. Our findings establish<SUP> </SUP>a =
previously=20
unappreciated role for Olig2 in astrocyte development<SUP> </SUP>and =
suggest=20
that Olig2 directs the primary specification of<SUP> </SUP>glial versus =
neuronal=20
lineages in SVZ progenitors, making it<SUP> </SUP>the first intrinsic =
fate=20
determinant shown to operate within<SUP> </SUP>the postnatal SVZ.<SUP> =
</SUP>
<P><STRONG>A role for Olig2 in astrocyte =
differentiation</STRONG><BR>Olig2=20
expression has not been reported previously in forebrain<SUP> =
</SUP>astrocytes.=20
It is not surprising, however, that this is the<SUP> </SUP>case. GFAP is =
the=20
most common molecular marker used for the<SUP> </SUP>identification of=20
astrocytes, and it is expressed at relatively<SUP> </SUP>late stages of=20
astrocyte development in rodents. Still, we observed<SUP> </SUP>many =
astrocytes=20
throughout the forebrain that coexpressed Olig2<SUP> </SUP>and GFAP. One =

possible explanation for the discrepancy between<SUP> </SUP>our findings =
and=20
those of other studies is the method of detecting<SUP> </SUP>GFAP in =
tissue=20
sections. Using basic immunofluorescence techniques,<SUP> </SUP>GFAP =
expression=20
is readily detectable in a subset of the astrocytes<SUP> =
</SUP>populating the=20
SVZ, white matter, and subpial area. However,<SUP> </SUP>other =
astrocytes,=20
located in gray matter, express lower levels<SUP> </SUP>of GFAP, which =
is less=20
easily detectable. To visualize all forebrain<SUP> </SUP>astrocytes with =
GFAP=20
immunofluorescence, we used an antigen<SUP> </SUP>retrieval technique. =
Many of=20
these "unmasked" GFAP-expressing<SUP> </SUP>astrocytes were positive for =
Olig2.=20
Thus, this difference in<SUP> </SUP>GFAP detection might account for =
differences=20
between our data<SUP> </SUP>and those reporting no Olig2 expression in =
forebrain=20
astrocytes<SUP> </SUP>(Zhou et al., 2002).<SUP> </SUP>
<P>In addition, Olig2 expression is downregulated in mature =
astrocytes.<SUP>=20
</SUP>Astrocytes in the adult forebrain express little, if any,=20
immunodetectable<SUP> </SUP>Olig2 (R. Ventura, unpublished =
observations). Thus,=20
studies<SUP> </SUP>focused on Olig2 expression in mature glia would not =
have=20
seen<SUP> </SUP>expression in astrocytes. A transient expression in=20
developing<SUP> </SUP>astrocytes supports <I>in vitro</I> studies in =
which Olig2=20
expression<SUP> </SUP>was positively correlated with an immature =
astrocyte=20
phenotype<SUP> </SUP>but negatively correlated with a fully mature =
phenotype=20
(Gabay<SUP> </SUP>et al., 2003<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF12"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>) and partially inhibited GFAP transcription (Fukuda<SUP> =
</SUP>et=20
al., 2003<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF11"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>) in neural progenitor cultures. However, in these<SUP>=20
</SUP>experiments, a significant proportion of cells misexpressing<SUP>=20
</SUP>Olig2 remained GFAP+. Thus, Olig2 may not be sufficient to =
regulate<SUP>=20
</SUP>GFAP expression. Together with our findings <I>in vivo</I>, these=20
results<SUP> </SUP>point to two potential roles for Olig2 in astrocyte=20
development<SUP> </SUP>(supplemental Fig. 2, available at <A=20
href=3D"http://www.jneurosci.org/">http://www.jneurosci.org/</A> as <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289/DC1">supplem=
ental=20
material</A>).<SUP> </SUP>First, Olig2 function is required for =
astrocyte=20
formation<SUP> </SUP>in SVZ cells. Second, Olig2 may also serve to limit =
GFAP=20
expression.<SUP> </SUP>
<P>Olig1/2 mutants suffer a complete loss of oligodendrocytes,<SUP> =
</SUP>but no=20
astrocyte phenotype was observed (Zhou et al., 2002).<SUP> </SUP>Several =

potential interpretations of the Olig1/2 mutants can<SUP> </SUP>be made =
with=20
respect to the forebrain. First, there are at least<SUP> </SUP>two =
sources of=20
astrocytes in the postnatal forebrain. One population<SUP> </SUP>arises =
directly=20
from radial glia that transform during the perinatal<SUP> </SUP>period =
into=20
astrocytes (Voigt, 1989<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF34"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>), whereas another population<SUP> </SUP>arises from =
migratory=20
progenitors within the SVZ (Levison and<SUP> </SUP>Goldman, 1993<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF17"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>; Luskin et al., 1993<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF23"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>). Therefore, even a complete<SUP> </SUP>deficit in one =
class of=20
astrocyte may not be noticeable on a<SUP> </SUP>gross level of =
examination. Our=20
findings only demonstrate a<SUP> </SUP>requirement for Olig2 in the =
development=20
of SVZ-derived astrocytes.<SUP> </SUP>Importantly, our retroviral =
labeling=20
technique does not infect<SUP> </SUP>postnatal radial glia, which =
proliferate=20
infrequently at this<SUP> </SUP>time relative to SVZ progenitors. Thus, =
it is=20
possible that<SUP> </SUP>astrocytes observed in the Olig1/2 mutants =
could be=20
derived<SUP> </SUP>exclusively from radial glial origins but not from=20
SVZ-derived<SUP> </SUP>astrocytes, which require Olig2 expression for =
their=20
formation.<SUP> </SUP>
<P>Could Olig1 compensate for Olig2? Olig1 and Olig2 expression<SUP> =
</SUP>is=20
similar if not identical in the postnatal SVZ (C. A. G. Marshall,<SUP>=20
</SUP>unpublished observations), and Olig1 misexpression increases<SUP>=20
</SUP>astrocytes and oligodendrocytes in the developing forebrain<SUP> =
</SUP>(Lu=20
et al., 2001<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF21"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>); the two factors may work together in repressing<SUP>=20
</SUP>neurogenesis and/or promoting gliogenesis. However, if Olig1<SUP>=20
</SUP>compensated fully for Olig2 in the Olig2 blocking =
experiments,<SUP>=20
</SUP>we would have expected to see some gliogenesis in SVZ cells<SUP>=20
</SUP>expressing the truncated Olig2 construct, but we did not. It<SUP> =
</SUP>is=20
unlikely that Olig1 and Olig2 bind to identical DNA sequences,<SUP> =
</SUP>given=20
the low homology these genes share in their bHLH domains.<SUP> </SUP>The =
Olig2=20
constructs used for functional experiments are specific<SUP> =
</SUP>(Novitch et=20
al., 2001<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF29"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>; Zhou and Anderson, 2002<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF38"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>; Gabay et al.,<SUP> </SUP>2003<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF12"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>).<SUP> </SUP>
<P><STRONG>Olig2 expression in radial glia</STRONG><BR>Although it is =
not clear=20
whether Olig2 is required for the production<SUP> </SUP>of astrocytes =
from=20
postmitotic radial glia, we found that cortical<SUP> </SUP>radial glia =
did=20
express Olig2 during the perinatal period (we<SUP> </SUP>examined =
P0-P10).=20
Unlike the spinal cord, the cerebral cortex<SUP> </SUP>does not express =
Olig2=20
during earlier, neurogenic stages of<SUP> </SUP>development (Nery et =
al., 2001<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF27"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>; our unpublished data). Rather,<SUP> </SUP>Olig2 is =
expressed in=20
radial glia later, at a time when they<SUP> </SUP>have finished =
generating=20
projection neurons and have "switched"<SUP> </SUP>from a primarily =
neurogenic=20
state to a primarily gliogenic state<SUP> </SUP>(Anthony et al., 2004<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF3"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>). Therefore, another potential role for<SUP> </SUP>Olig2 =
in=20
neonatal forebrain development is to repress neurogenesis<SUP> </SUP>in =
cortical=20
radial glia. Radial glia express astrocytic molecules<SUP> </SUP>such as =

glutamate transporters and intermediate filaments and<SUP> </SUP>may be=20
committed to their astrocytic fate, however, before expression<SUP> =
</SUP>of=20
Olig2. Experiments aimed at understanding the function of<SUP> =
</SUP>Olig2 in=20
these dynamic cells will be required to understand<SUP> </SUP>any part =
it might=20
play in determining their fates or the fates<SUP> </SUP>of their =
progeny.<SUP>=20
</SUP>
<P><STRONG>SVZ cell phenotype and migration</STRONG><BR>SVZ cells =
specified to=20
become interneurons migrate rostrally<SUP> </SUP>via the RMS into the =
olfactory=20
bulb (Altman, 1969<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF2"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>; Luskin, 1993<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF22"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>;<SUP> </SUP>Lois and Alvarez-Buylla, 1994<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF20"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>), whereas SVZ cells specified<SUP> </SUP>to become glia =
migrate=20
radially into the developing parenchyma<SUP> </SUP>(<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#FIG1">Fig.=20
1<I>A</I></A>) (Altman, 1966<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF1"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>; Paterson et al., 1973<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF31"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>; Imamoto et al.,<SUP> </SUP>1978<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF14"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>; Levison and Goldman, 1993<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF17"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>; Luskin et al., 1993<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF23"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>; Suzuki<SUP> </SUP>and Goldman, 2003<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF33"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>). The synchronization of SVZ cell phenotype<SUP> =
</SUP>and=20
migration behavior is not understood. Do SVZ progenitors<SUP>=20
</SUP>stochastically choose a rostral versus radial migration =
pathway<SUP>=20
</SUP>before becoming committed to neuronal and glial lineages? Or,<SUP> =

</SUP>does the phenotype of a cell dictate the direction of its =
migration?<SUP>=20
</SUP>One model that would explain this tight correlation between<SUP>=20
</SUP>cell fate and migration behavior is one in which progenitors<SUP>=20
</SUP>become specified to a glial lineage before their emigration<SUP>=20
</SUP>from the SVZ. Our findings strongly support such a model. We<SUP>=20
</SUP>demonstrate that SVZ cell fate decisions are likely to depend<SUP> =

</SUP>critically on the expression of transcriptional regulators =
such<SUP>=20
</SUP>as Olig2. Olig2-directed glial specification may subsequently<SUP> =

</SUP>confer on these cells an ability to migrate across SVZ =
borders<SUP>=20
</SUP>through transcriptional regulation of specific receptors or<SUP>=20
</SUP>adhesion molecules involved in accessing the radial glial =
scaffold<SUP>=20
</SUP>and migrating through the perinatal brain. Because Olig2 =
functions<SUP>=20
</SUP>as a transcriptional repressor, it might serve to =
downregulate<SUP>=20
</SUP>genes that otherwise prevent emigration from the SVZ. Thus,<SUP> =
</SUP>a=20
knowledge of downstream targets for Olig2 may contribute to<SUP> =
</SUP>an=20
understanding of phenotypic specification as well as cell<SUP>=20
</SUP>distribution within the postnatal brain.<SUP> </SUP>
<P><STRONG>SVZ cell potential</STRONG><BR>Our model (supplemental Fig. =
2,=20
available at <A=20
href=3D"http://www.jneurosci.org/">http://www.jneurosci.org/</A><SUP> =
</SUP>as <A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289/DC1">supplem=
ental=20
material</A>) reconciles data from <I>in vitro</I> studies<SUP> =
</SUP>(Noble et=20
al., 2004<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF28"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>), which point to bipotent and tripotent<SUP> </SUP>cells =
in the=20
developing forebrain (Levison and Goldman, 1997<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF18"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>)<SUP> </SUP>and spinal cord (Gabay et al., 2003<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF12"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>), with <I>in vivo</I> work (Levison<SUP> </SUP>and =
Goldman, 1993<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF17"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>; Luskin et al., 1993<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF23"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>; Parnavelas, 1999<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF30"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>; Liu<SUP> </SUP>and Rao, 2004<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF19"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>; Zerlin et al., 2004<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF37"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>), in which a smaller population<SUP> </SUP>of cells =
demonstrate=20
such broad potential. What intrinsic and<SUP> </SUP>extrinsic cues =
direct=20
progenitors that are multipotent <I>in vitro</I><SUP> </SUP>to a limited =
range=20
of fates <I>in vivo</I>? Studies of progenitor specification<SUP> =
</SUP>have=20
been performed predominantly in embryonic systems, such<SUP> </SUP>as =
the spinal=20
cord, in which a sequential assignment of neuronal<SUP> </SUP>and glial=20
phenotypes has been revealed and important molecular<SUP> </SUP>fate =
regulators=20
have been identified (Lee and Jessell, 1999<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF16"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>;<SUP> </SUP>Briscoe and Ericson, 2001<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF5"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>). Although recent studies have indicated<SUP> =
</SUP>functions for=20
some of these molecular regulators in forebrain<SUP> </SUP>development =
(Woodruff=20
et al., 2001<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF36"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>; Bertrand et al., 2002<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF4"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>),<SUP> </SUP>the dynamics of neuronal and glial cell =
production in=20
the subventricular<SUP> </SUP>zone are distinct from those in the =
embryonic cord=20
and are less<SUP> </SUP>clear.<SUP> </SUP>
<P>The SVZ generates interneurons, astrocytes, and oligodendrocytes<SUP> =

</SUP>simultaneously during the perinatal period, but its output =
changes<SUP>=20
</SUP>over time, so that the adult SVZ primarily generates neurons<SUP>=20
</SUP>(Doetsch et al., 1999<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF9"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>, 2002<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF10"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>) and only limited numbers of glia<SUP> </SUP>(Hack et =
al., 2005<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF13"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>). The molecular mechanisms regulating this<SUP> =
</SUP>switch to=20
neurogenesis are not known, and a lack of temporospatial<SUP> =
</SUP>segregation=20
among neuronal and glial progenitors has made this<SUP> </SUP>switch =
difficult=20
to analyze. Even in the adult SVZ, however,<SUP> </SUP>constitutive =
expression=20
of Olig2 via retrovirus leads to a substantial<SUP> </SUP>increase in=20
gliogenesis (Hack et al., 2005<A=20
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#REF13"><IMG=20
height=3D7 alt=3DGo src=3D"http://www.jneurosci.org/icons/fig-down.gif" =
width=3D8=20
border=3D1></A>), suggesting that<SUP> </SUP>perinatal mechanisms may =
persist into=20
adulthood. Our data showing<SUP> </SUP>the sufficiency of Olig2 in =
directing=20
primary, pan-glial versus<SUP> </SUP>neuronal fate decisions in the =
perinatal=20
SVZ is a fundamental<SUP> </SUP>step toward understanding the molecular=20
mechanisms that regulate<SUP> </SUP>SVZ cell fates. In the future, a =
detailed=20
knowledge of SVZ cell<SUP> </SUP>fate regulation under normal conditions =
will be=20
paramount for<SUP> </SUP>studying the responses of such cells to =
pathologic=20
cues, as<SUP> </SUP>well as accessing this endogenous source of =
progenitors=20
for<SUP> </SUP>potential therapeutic interventions in the diseased =
brain.<SUP>=20
</SUP>
<P><A name=3DFN><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/rarrow.gif"=20
      width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      Footnotes </FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>Received May =
13, 2005;=20
revised June 28, 2005; accepted June 29, 2005.
<P><A name=3D""><!-- null --></A>C.A.G.M. and J.E.G. were supported by =
National=20
Institute of<SUP> </SUP>Neurological Disorders and Stroke Grant =
NS-17125. B.G.N.=20
was<SUP> </SUP>a Marion Abbe Fellow of the Damon Runyon Cancer Research=20
Fund<SUP> </SUP>(DRG-1569). We thank Tom Jessell and Fiona Doetsch for=20
insightful<SUP> </SUP>discussions and comments on this manuscript. We =
are=20
grateful<SUP> </SUP>to Carol Mason for graciously sharing imaging =
equipment,=20
Rachel<SUP> </SUP>Ventura for help with Olig2 expression analysis, and=20
Michael<SUP> </SUP>Hack and Magdalena Gotz for sharing unpublished work. =

Finally,<SUP> </SUP>we thank Satoshi Suzuki and Ana Milosevic for =
providing=20
expert<SUP> </SUP>assistance with retroviral production and stereotaxic=20
injections.<SUP> </SUP>
<P><A name=3D""><!-- null --></A>Correspondence should be addressed to =
Dr. James=20
E. Goldman,<SUP> </SUP>Division of Neuropathology, Department of =
Pathology,=20
Columbia<SUP> </SUP>University, College of Physicians and Surgeons, 630 =
West=20
168th<SUP> </SUP>Street, New York, NY 10032. E-mail: <SPAN=20
id=3Dem0>Jeg5{at}columbia.edu</SPAN>
<SCRIPT type=3Dtext/javascript><!--=0A=
 var u =3D "Jeg5", d =3D "columbia.edu"; =
document.getElementById("em0").innerHTML =3D '<a href=3D"mailto:' + u + =
'@' + d + '">' + u + '@' + d + '<\/a>'//--></SCRIPT>
.<SUP> </SUP>
<P><A name=3D""><!-- null --></A>Copyright =A9 2005 Society for =
Neuroscience=20
0270-6474/05/257289-10$15.00/0<SUP> </SUP>
<P><A name=3DBIBL><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.jneurosci.org/icons/toc/rarrow.gif"=20
      width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      References </FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#top"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#ABS"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Abstract<BR></A><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#SEC1"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Introduction<BR></A><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#SEC2"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Materials and Methods<BR></A><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#SEC3"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Results<BR></A><A=20
      =
href=3D"http://www.jneurosci.org/cgi/content/full/25/32/7289?ijkey=3D8895=
8bd79eba18cf7ca01fbbf30cd5269877dcff#SEC4"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Discussion<BR></A><IMG height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.jneurosci.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      =
color=3D#464c53>References</FONT><BR></FONT></TH></TR></TBODY></TABLE>&nb=
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.gif"=20
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page"=20
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width=3D49=20
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size=3D-1>A. C.=20
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ct]</A>=20
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<BR><IMG=20
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src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D499>=20
      </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
    </TD></TR></TBODY></TABLE>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://www.pnas.org/"><IMG height=3D80 alt=3D"Home page"=20
      src=3D"http://www.pnas.org/portal_imgs/search_result.gif" =
width=3D59 vspace=3D5=20
      border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/pnas.gif"=
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page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>L.=20
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Jones, P.=20
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Nikolov,=20
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Buxbaum, N.=20
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O'Donovan<BR><STRONG>Convergent=20
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(OLIG2) and=20
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      - 12474. <BR><A=20
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href=3D"http://www.pnas.org/cgi/content/abstract/103/33/12469">[Abstract]=
</A>=20
      <A =
href=3D"http://www.pnas.org/cgi/content/full/103/33/12469">[Full=20
      Text]</A> <A =
href=3D"http://www.pnas.org/cgi/reprint/103/33/12469">[PDF]</A>=20
      <BR><IMG height=3D1 alt=3D"" =
src=3D"http://www.jneurosci.org/icons/spacer.gif"=20
      width=3D499> </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
    </TD></TR></TBODY></TABLE>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://www.jneurosci.org/"><IMG height=3D80 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/portal_imgs/search_result.gif" =
width=3D59=20
      vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
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f"=20
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page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>B.=20
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ct]</A>=20
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href=3D"http://www.jneurosci.org/cgi/content/full/26/30/7907">[Full=20
      Text]</A> <A=20
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<BR><IMG=20
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src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D499>=20
      </FONT></TD>
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      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
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<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://www.jneurosci.org/"><IMG height=3D80 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/portal_imgs/search_result.gif" =
width=3D59=20
      vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A =
href=3D"http://www.jneurosci.org/"><IMG=20
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src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/jneuro.gi=
f"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>M.=20
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ct]</A>=20
      <A =
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      Text]</A> <A=20
      href=3D"http://www.jneurosci.org/cgi/reprint/26/25/6781">[PDF]</A> =
<BR><IMG=20
      height=3D1 alt=3D"" =
src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D499>=20
      </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
    </TD></TR></TBODY></TABLE>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://www.pnas.org/"><IMG height=3D80 alt=3D"Home page"=20
      src=3D"http://www.pnas.org/portal_imgs/search_result.gif" =
width=3D59 vspace=3D5=20
      border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A =
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      height=3D16 alt=3D"Proc. Natl. Acad. Sci. U. S. A."=20
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src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/pnas.gif"=
=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>K. L.=20
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D. J.=20
      Anderson, C. D. Stiles, and D. H. Rowitch<BR><STRONG>Development =
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      neural progenitor cells requires Olig gene =
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href=3D"http://www.pnas.org/cgi/content/abstract/103/20/7853">[Abstract]<=
/A>=20
      <A href=3D"http://www.pnas.org/cgi/content/full/103/20/7853">[Full =
Text]</A>=20
      <A href=3D"http://www.pnas.org/cgi/reprint/103/20/7853">[PDF]</A> =
<BR><IMG=20
      height=3D1 alt=3D"" =
src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D499>=20
      </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
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<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://www.jneurosci.org/"><IMG height=3D80 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/portal_imgs/search_result.gif" =
width=3D59=20
      vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D5></TD>
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src=3D"http://www.jneurosci.org/icons/shared/searchall/journals/jneuro.gi=
f"=20
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page"=20
      src=3D"http://www.jneurosci.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>I.=20
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act]</A>=20
      <A =
href=3D"http://www.jneurosci.org/cgi/content/full/25/44/10064">[Full=20
      Text]</A> <A=20
      =
href=3D"http://www.jneurosci.org/cgi/reprint/25/44/10064">[PDF]</A> =
<BR><IMG=20
      height=3D1 alt=3D"" =
src=3D"http://www.jneurosci.org/icons/spacer.gif" width=3D499>=20
      </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.jneurosci.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
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Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://www.jneurosci.org/javascript/ajax/xmlhttprequest.js

/*=0A=
=0A=
Cross-Browser XMLHttpRequest v1.2=0A=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=0A=
=0A=
Emulate Gecko 'XMLHttpRequest()' functionality in IE and Opera. Opera =
requires=0A=
the Sun Java Runtime Environment <http://www.java.com/>.=0A=
=0A=
by Andrew Gregory=0A=
http://www.scss.com.au/family/andrew/webdesign/xmlhttprequest/=0A=
=0A=
This work is licensed under the Creative Commons Attribution License. To =
view a=0A=
copy of this license, visit =
http://creativecommons.org/licenses/by-sa/2.5/ or=0A=
send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, =
California=0A=
94305, USA.=0A=
=0A=
Attribution: Leave my name and web address in this script intact.=0A=
=0A=
Not Supported in Opera=0A=
----------------------=0A=
* user/password authentication=0A=
* responseXML data member=0A=
=0A=
Not Fully Supported in Opera=0A=
----------------------------=0A=
* async requests=0A=
* abort()=0A=
* getAllResponseHeaders(), getAllResponseHeader(header)=0A=
=0A=
*/=0A=
// IE support=0A=
if (window.ActiveXObject && !window.XMLHttpRequest) {=0A=
  window.XMLHttpRequest =3D function() {=0A=
    var msxmls =3D new Array(=0A=
      'Msxml2.XMLHTTP.5.0',=0A=
      'Msxml2.XMLHTTP.4.0',=0A=
      'Msxml2.XMLHTTP.3.0',=0A=
      'Msxml2.XMLHTTP',=0A=
      'Microsoft.XMLHTTP');=0A=
    for (var i =3D 0; i < msxmls.length; i++) {=0A=
      try {=0A=
        return new ActiveXObject(msxmls[i]);=0A=
      } catch (e) {=0A=
      }=0A=
    }=0A=
    return null;=0A=
  };=0A=
}=0A=
// Gecko support=0A=
/* ;-) */=0A=
// Opera support=0A=
if (window.opera && !window.XMLHttpRequest) {=0A=
  window.XMLHttpRequest =3D function() {=0A=
    this.readyState =3D 0; // =
0=3Duninitialized,1=3Dloading,2=3Dloaded,3=3Dinteractive,4=3Dcomplete=0A=
    this.status =3D 0; // HTTP status codes=0A=
    this.statusText =3D '';=0A=
    this._headers =3D [];=0A=
    this._aborted =3D false;=0A=
    this._async =3D true;=0A=
    this._defaultCharset =3D 'ISO-8859-1';=0A=
    this._getCharset =3D function() {=0A=
      var charset =3D _defaultCharset;=0A=
      var contentType =3D =
this.getResponseHeader('Content-type').toUpperCase();=0A=
      val =3D contentType.indexOf('CHARSET=3D');=0A=
      if (val !=3D -1) {=0A=
        charset =3D contentType.substring(val);=0A=
      }=0A=
      val =3D charset.indexOf(';');=0A=
      if (val !=3D -1) {=0A=
        charset =3D charset.substring(0, val);=0A=
      }=0A=
      val =3D charset.indexOf(',');=0A=
      if (val !=3D -1) {=0A=
        charset =3D charset.substring(0, val);=0A=
      }=0A=
      return charset;=0A=
    };=0A=
    this.abort =3D function() {=0A=
      this._aborted =3D true;=0A=
    };=0A=
    this.getAllResponseHeaders =3D function() {=0A=
      return this.getAllResponseHeader('*');=0A=
    };=0A=
    this.getAllResponseHeader =3D function(header) {=0A=
      var ret =3D '';=0A=
      for (var i =3D 0; i < this._headers.length; i++) {=0A=
        if (header =3D=3D '*' || this._headers[i].h =3D=3D header) {=0A=
          ret +=3D this._headers[i].h + ': ' + this._headers[i].v + '\n';=0A=
        }=0A=
      }=0A=
      return ret;=0A=
    };=0A=
    this.getResponseHeader =3D function(header) {=0A=
      var ret =3D getAllResponseHeader(header);=0A=
      var i =3D ret.indexOf('\n');=0A=
      if (i !=3D -1) {=0A=
        ret =3D ret.substring(0, i);=0A=
      }=0A=
      return ret;=0A=
    };=0A=
    this.setRequestHeader =3D function(header, value) {=0A=
      this._headers[this._headers.length] =3D {h:header, v:value};=0A=
    };=0A=
    this.open =3D function(method, url, async, user, password) {=0A=
      this.method =3D method;=0A=
      this.url =3D url;=0A=
      this._async =3D true;=0A=
      this._aborted =3D false;=0A=
      this._headers =3D [];=0A=
      if (arguments.length >=3D 3) {=0A=
        this._async =3D async;=0A=
      }=0A=
      if (arguments.length > 3) {=0A=
        opera.postError('XMLHttpRequest.open() - user/password not =
supported');=0A=
      }=0A=
      this.readyState =3D 1;=0A=
      if (this.onreadystatechange) {=0A=
        this.onreadystatechange();=0A=
      }=0A=
    };=0A=
    this.send =3D function(data) {=0A=
      if (!navigator.javaEnabled()) {=0A=
        alert("XMLHttpRequest.send() - Java must be installed and =
enabled.");=0A=
        return;=0A=
      }=0A=
      if (this._async) {=0A=
        setTimeout(this._sendasync, 0, this, data);=0A=
        // this is not really asynchronous and won't execute until the =
current=0A=
        // execution context ends=0A=
      } else {=0A=
        this._sendsync(data);=0A=
      }=0A=
    }=0A=
    this._sendasync =3D function(req, data) {=0A=
      if (!req._aborted) {=0A=
        req._sendsync(data);=0A=
      }=0A=
    };=0A=
    this._sendsync =3D function(data) {=0A=
      this.readyState =3D 2;=0A=
      if (this.onreadystatechange) {=0A=
        this.onreadystatechange();=0A=
      }=0A=
      // open connection=0A=
      var url =3D new java.net.URL(new =
java.net.URL(window.location.href), this.url);=0A=
      var conn =3D url.openConnection();=0A=
      for (var i =3D 0; i < this._headers.length; i++) {=0A=
        conn.setRequestProperty(this._headers[i].h, this._headers[i].v);=0A=
      }=0A=
      this._headers =3D [];=0A=
      if (this.method =3D=3D 'POST') {=0A=
        // POST data=0A=
        conn.setDoOutput(true);=0A=
        var wr =3D new =
java.io.OutputStreamWriter(conn.getOutputStream(), this._getCharset());=0A=
        wr.write(data);=0A=
        wr.flush();=0A=
        wr.close();=0A=
      }=0A=
      // read response headers=0A=
      // NOTE: the getHeaderField() methods always return nulls for me :(=0A=
      var gotContentEncoding =3D false;=0A=
      var gotContentLength =3D false;=0A=
      var gotContentType =3D false;=0A=
      var gotDate =3D false;=0A=
      var gotExpiration =3D false;=0A=
      var gotLastModified =3D false;=0A=
      for (var i =3D 0; ; i++) {=0A=
        var hdrName =3D conn.getHeaderFieldKey(i);=0A=
        var hdrValue =3D conn.getHeaderField(i);=0A=
        if (hdrName =3D=3D null && hdrValue =3D=3D null) {=0A=
          break;=0A=
        }=0A=
        if (hdrName !=3D null) {=0A=
          this._headers[this._headers.length] =3D {h:hdrName, =
v:hdrValue};=0A=
          switch (hdrName.toLowerCase()) {=0A=
            case 'content-encoding': gotContentEncoding =3D true; break;=0A=
            case 'content-length'  : gotContentLength   =3D true; break;=0A=
            case 'content-type'    : gotContentType     =3D true; break;=0A=
            case 'date'            : gotDate            =3D true; break;=0A=
            case 'expires'         : gotExpiration      =3D true; break;=0A=
            case 'last-modified'   : gotLastModified    =3D true; break;=0A=
          }=0A=
        }=0A=
      }=0A=
      // try to fill in any missing header information=0A=
      var val;=0A=
      val =3D conn.getContentEncoding();=0A=
      if (val !=3D null && !gotContentEncoding) =
this._headers[this._headers.length] =3D {h:'Content-encoding', v:val};=0A=
      val =3D conn.getContentLength();=0A=
      if (val !=3D -1 && !gotContentLength) =
this._headers[this._headers.length] =3D {h:'Content-length', v:val};=0A=
      val =3D conn.getContentType();=0A=
      if (val !=3D null && !gotContentType) =
this._headers[this._headers.length] =3D {h:'Content-type', v:val};=0A=
      val =3D conn.getDate();=0A=
      if (val !=3D 0 && !gotDate) this._headers[this._headers.length] =
=3D {h:'Date', v:(new Date(val)).toUTCString()};=0A=
      val =3D conn.getExpiration();=0A=
      if (val !=3D 0 && !gotExpiration) =
this._headers[this._headers.length] =3D {h:'Expires', v:(new =
Date(val)).toUTCString()};=0A=
      val =3D conn.getLastModified();=0A=
      if (val !=3D 0 && !gotLastModified) =
this._headers[this._headers.length] =3D {h:'Last-modified', v:(new =
Date(val)).toUTCString()};=0A=
      // read response data=0A=
      var reqdata =3D '';=0A=
      var stream =3D conn.getInputStream();=0A=
      if (stream) {=0A=
        var reader =3D new java.io.BufferedReader(new =
java.io.InputStreamReader(stream, this._getCharset()));=0A=
        var line;=0A=
        while ((line =3D reader.readLine()) !=3D null) {=0A=
          if (this.readyState =3D=3D 2) {=0A=
            this.readyState =3D 3;=0A=
            if (this.onreadystatechange) {=0A=
              this.onreadystatechange();=0A=
            }=0A=
          }=0A=
          reqdata +=3D line + '\n';=0A=
        }=0A=
        reader.close();=0A=
        this.status =3D 200;=0A=
        this.statusText =3D 'OK';=0A=
        this.responseText =3D reqdata;=0A=
        this.readyState =3D 4;=0A=
        if (this.onreadystatechange) {=0A=
          this.onreadystatechange();=0A=
        }=0A=
        if (this.onload) {=0A=
          this.onload();=0A=
        }=0A=
      } else {=0A=
        // error=0A=
        this.status =3D 404;=0A=
        this.statusText =3D 'Not Found';=0A=
        this.responseText =3D '';=0A=
        this.readyState =3D 4;=0A=
        if (this.onreadystatechange) {=0A=
          this.onreadystatechange();=0A=
        }=0A=
        if (this.onerror) {=0A=
          this.onerror();=0A=
        }=0A=
      }=0A=
    };=0A=
  };=0A=
}=0A=
// ActiveXObject emulation=0A=
if (!window.ActiveXObject && window.XMLHttpRequest) {=0A=
  window.ActiveXObject =3D function(type) {=0A=
    switch (type.toLowerCase()) {=0A=
      case 'microsoft.xmlhttp':=0A=
      case 'msxml2.xmlhttp':=0A=
      case 'msxml2.xmlhttp.3.0':=0A=
      case 'msxml2.xmlhttp.4.0':=0A=
      case 'msxml2.xmlhttp.5.0':=0A=
        return new XMLHttpRequest();=0A=
    }=0A=
    return null;=0A=
  };=0A=
}=0A=

------=_NextPart_000_0066_01C709AF.2E622820
Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://www.jneurosci.org/javascript/ajax/utility.js

/************************************************************************=
*****=0A=
 * javascript/ajax/utility.js=0A=
 *=0A=
 * Utility functions for working with XMLHttpRequest data.=0A=
 *=0A=
 * Copyright 2006 Board of Trustees of the Leland Stanford Junior =
University.=0A=
 =
*************************************************************************=
***/=0A=
=0A=
/*=0A=
 * Copy XML nodes into an HTMLElement. This effectively=0A=
 * clones XML markup which uses XHTML naming conventions=0A=
 * into an HTML DOM.=0A=
 */=0A=
function copy_xml_to_html(src, dst) {=0A=
  if (src.nodeType =3D=3D 1) { /* Node.ELEMENT_NODE */=0A=
    var e =3D document.createElement(src.nodeName);=0A=
    for (var i =3D 0; i < src.childNodes.length; i++) {=0A=
	  copy_xml_to_html(src.childNodes[i], e);=0A=
    }=0A=
    for (var i =3D 0; i < src.attributes.length; i++) {=0A=
      var n =3D src.attributes[i].name;=0A=
      var v =3D unescape_xml_string(src.attributes[i].value);      =0A=
      e.setAttribute(n, v);=0A=
      if (n =3D=3D "class") {=0A=
        e.className =3D v;=0A=
      }=0A=
      else if (n =3D=3D "style") {=0A=
        set_css_style(v, e, "");=0A=
      }=0A=
    }=0A=
    dst.appendChild(e);=0A=
  }=0A=
  else if (src.nodeType =3D=3D 3) { /* Node.TEXT_NODE */=0A=
    dst.appendChild(document.createTextNode(src.nodeValue));=0A=
  }=0A=
}=0A=
=0A=
/* =0A=
 * It is unclear that this is the right thing to be calling=0A=
 * from copy_xml_to_html, but it appears that Safari decides=0A=
 * to convert &amp; to the NCR &#35;, and then encodes that=0A=
 * NCR to &%26%2338;.  So, I'm going to treat the DOM Attr=0A=
 * value as a plain string, and run our XML string input=0A=
 * through the decoding routine below.=0A=
 */=0A=
function unescape_xml_string(s) {=0A=
  return s.replace(/&apos;/g, "'")=0A=
          .replace(/&#39;/g,  "'")=0A=
          .replace(/&quot;/g, "\"")=0A=
          .replace(/&#34;/g,  "\"")=0A=
          .replace(/&gt;/g,   ">")=0A=
          .replace(/&#62;/g,  ">")=0A=
          .replace(/&lt;/g,   "<")=0A=
          .replace(/&#60;/g,  "<")=0A=
          .replace(/&amp;/g,  "&")=0A=
          .replace(/&#38;/g,  "&");=0A=
}=0A=
=0A=
/*=0A=
 * Parse set of CSS rules and apply them to an element.=0A=
 * This is quite horrifying, but I'm unable to determine=0A=
 * how else to handle this with IE 6.  FireFox and other=0A=
 * sane browsers let you simply set the style attribute=0A=
 * or use e.style.setProperty(rule, value, priority),=0A=
 * IE 6 appears to have neither of these capabilities..=0A=
 */=0A=
function set_css_style(css, e, priority) {=0A=
  var rules =3D css.split(";");=0A=
  for (var i =3D 0; i < rules.length; i++) {=0A=
    var nvpair =3D rules[i].split(":");=0A=
    if (nvpair.length =3D=3D 2) {=0A=
      try {=0A=
        var name  =3D nvpair[0]; /* style attribute */=0A=
        var value =3D nvpair[1]; /* attribute value */=0A=
  =0A=
        /*=0A=
         * For each possible style attribute, set the=0A=
         * appropriate style property in the element.=0A=
         */=0A=
        if (name =3D=3D "background") {=0A=
           e.style.background =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-attachment") {=0A=
          e.style.backgroundAttachment =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-color") {=0A=
          e.style.backgroundColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-image") {=0A=
          e.style.backgroundImage =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-position") {=0A=
          e.style.backgroundPosition =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-position-x") {=0A=
          e.style.backgroundPositionX =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-position-y") {=0A=
          e.style.backgroundPositionY =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-repeat") {=0A=
          e.style.backgroundRepeat =3D value;=0A=
        }=0A=
        else if (name =3D=3D "behavior") {=0A=
          e.style.behavior =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border") {=0A=
          e.style.border =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom") {=0A=
          e.style.borderBottom =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom-color") {=0A=
          e.style.borderBottomColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom-style") {=0A=
          e.style.borderBottomStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom-width") {=0A=
          e.style.borderBottomWidth =3D value;=0A=
        }=0A=
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}=0A=

------=_NextPart_000_0066_01C709AF.2E622820
Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://www.jneurosci.org/javascript/entrez/callback.js

/************************************************************************=
*****=0A=
 * javascript/entrez/callback.js=0A=
 *=0A=
 * Entrez Linking callback to populate content box.=0A=
 *=0A=
 * Copyright 2006 Board of Trustees of the Leland Stanford Junior =
University.=0A=
 =
*************************************************************************=
***/=0A=
=0A=
/*=0A=
 * Execute callback to fill content box with Entrez Linking information.=0A=
 */=0A=
function entrez_callback(pmid, callback_url) {=0A=
  /*=0A=
   * MSIE 5.5 and below have issues with the JavaScript=0A=
   * used for Entrez Linking. For now we have to disable=0A=
   * the callback until we can track down a proper fix=0A=
   * (or everybody sanely upgrades to version 6 or 7!).=0A=
   */=0A=
  if (navigator) {=0A=
    var appname =3D navigator.appName;=0A=
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=0A=
  /*=0A=
   * Acquire table row element to update, initiate callback=0A=
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   */=0A=
  var tr =3D document.getElementById('entrez_callback_'+pmid);=0A=
  if (!tr) {=0A=
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  var req =3D new XMLHttpRequest();=0A=
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  req.open('GET', callback_url, true);=0A=
  req.send(null);=0A=
}=0A=

------=_NextPart_000_0066_01C709AF.2E622820--

