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1091-6490105322008Aug12Proceedings of the National Academy of Sciences of the United States of AmericaProc Natl Acad Sci U S AThe Fezf2-Ctip2 genetic pathway regulates the fate choice of subcortical projection neurons in the developing cerebral cortex.113821138711382-710.1073/pnas.0804918105Pyramidal neurons in the deep layers of the cerebral cortex can be classified into two major classes: callosal projection neurons and long-range subcortical neurons. We and others have shown that a gene expressed specifically by subcortical projection neurons, Fezf2, is required for the formation of axonal projections to the spinal cord, tectum, and pons. Here, we report that Fezf2 regulates a decision between subcortical vs. callosal projection neuron fates. Fezf2(-/-) neurons adopt the fate of callosal projection neurons as assessed by their axonal projections, electrophysiological properties, and acquisition of Satb2 expression. Ctip2 is a major downstream effector of Fezf2 in regulating the extension of axons toward subcortical targets and can rescue the axonal phenotype of Fezf2 mutants. When ectopically expressed, either Fezf2 or Ctip2 can alter the axonal targeting of corticocortical projection neurons and cause them to project to subcortical targets, although Fezf2 can promote a subcortical projection neuron fate in the absence of Ctip2 expression.ChenBinBDepartment of Biological Sciences, Stanford University, Stanford, CA 94305, USA. chenb@biology.ucsc.eduWangSong SSSHattoxAlexis MAMRayburnHelenHNelsonSacha BSBMcConnellSusan KSKengR01 MH066338MHNIMH NIH HHSUnited StatesMH066338MHNIMH NIH HHSUnited StatesT32 NS007292NSNINDS NIH HHSUnited StatesEY08411EYNEI NIH HHSUnited StatesR01 EY008411EYNEI NIH HHSUnited StatesJournal ArticleResearch Support, N.I.H., ExtramuralResearch Support, Non-U.S. Gov't20080804
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