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Neocortex Patterning by the Secreted Signaling Molecule FGF8
Tomomi Fukuchi-Shimogori,Elizabeth A. Grove*
A classic model proposes that the mammalian neocortex is divided
into areas early in neurogenesis, but the molecular mechanismsthat
generate the area map have been elusive. Here we provideevidence that
FGF8 regulates development of the map from a sourcein the anterior
telencephalon. Using electroporation-mediatedgene transfer in mouse
embryos, we show that augmenting the endogenousanterior FGF8 signal
shifts area boundaries posteriorly, reducingthe signal shifts them
anteriorly, and introducing a posteriorsource of FGF8 elicits partial
area duplications, revealed byectopic somatosensory barrel fields.
These findings support arole for FGF signaling in specifying
positional identity in theneocortex.
Department of Neurobiology, Pharmacology and Physiology,
University of Chicago, Chicago, IL 60637, USA.
*
To whom correspondence should be addressed. E-mail:
egrove{at}drugs.bsd.uchicago.edu
The editors suggest the following Related Resources on Science sites:
In Science Magazine
PERSPECTIVES
Pasko Rakic (2 November 2001) Science294 (5544), 1011.
[DOI: 10.1126/science.294.5544.1011] |Summary »|Full Text »|PDF »
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