Temporal Control of Mammalian Cortical Neurogenesis by m6A Methylation

N 6 -methyladenosine (m 6 A), installed by the Mettl3/Mettl14 methyltransferase complex, is the most prevalent internal mRNA modification. Whether m 6 A regulates mammalian brain development is unknown. Here, we show that m 6 A depletion by Mettl14 knockout in embryonic mouse brains prolongs the cell cycle of radial glia cells and extends cortical neurogenesis into postnatal stages. m 6 A depletion by Mettl3 knockdown also leads to a prolonged cell cycle and maintenance of radial glia cells. m 6 A sequencing of embryonic mouse cortex reveals enrichment of mRNAs related to transcription factors, neurogenesis, the cell cycle, and neuronal differentiation, and m 6 A tagging promotes their decay. Further analysis uncovers previously unappreciated transcriptional prepatterning in cortical neural stem cells. m 6 A signaling also regulates human cortical neurogenesis in forebrain organoids. Comparison of m 6 A-mRNA landscapes between mouse and human cortical neurogenesis reveals enrichment of human-specific m 6 A tagging of transcripts related to brain-disorder risk genes. Our study identifies an epitranscriptomic mechanism in heightened transcriptional coordination during mammalian cortical neurogenesis.