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The mechanisms by which early spatiotemporal expression patterns of transcription factors such as Pax6 regulate cortical progenitors in a region-specific manner are poorly understood. Pax6 is expressed in a gradient across the developing cortex and is essential for normal corticogenesis. We found that constitutive or conditional loss of Pax6 increases cortical progenitor proliferation by amounts that vary regionally with normal Pax6 levels. We compared the gene expression profiles of equivalent Pax6-expressing progenitors isolated from Pax6⁺/⁺ and Pax6⁻/⁻ cortices and identified many negatively regulated cell-cycle genes, including Cyclins and Cdks. Biochemical assays indicated that Pax6 directly represses Cdk6 expression. Cyclin/Cdk repression inhibits retinoblastoma protein (pRb) phosphorylation, thereby limiting the transcription of genes that directly promote the mechanics of the cell cycle, and we found that Pax6 inhibits pRb phosphorylation and represses genes involved in DNA replication. Our results indicate that Pax6's modulation of cortical progenitor cell cycles is regional and direct.

Original publication




Journal article



Publication Date





269 - 284


Animals, Body Patterning, Bromodeoxyuridine, Cell Cycle, Cell Proliferation, Cerebral Cortex, Chromatin Immunoprecipitation, Cyclin-Dependent Kinase 6, Embryo, Mammalian, Eye Proteins, Gene Expression Regulation, Developmental, Homeodomain Proteins, Luminescent Proteins, Mice, Mice, Transgenic, PAX7 Transcription Factor, Paired Box Transcription Factors, Phosphorylation, Protein Binding, Repressor Proteins, Retinoblastoma Protein, Stem Cells, Transcription Factors