Neural stem cell epigenomes and fate bias are temporally coordinated during corticogenesis
Shapira, Y.; Noack, F.; Vangelisti, S.; Chong, F.; Lifshitz, A.; Tanay, A.; Bonev, B.
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The cerebral cortex orchestrates complex cognitive functions, yet how its distinct temporal lineages are molecularly patterned during development remains unresolved. Here, we integrate single-cell transcriptomics and chromatin accessibility, together with genome-wide profiling of DNA methylation and 3D chromosomal contact across mouse corticogenesis (E13-E18) to elucidate cell fate transitions. Using metacell flow analysis, we reveal that neural stem cells (NSCs) progressively shift from a progenitor-biased state toward an astrocytic lineage and that this process is accompanied with changes in DNA methylation and 3D genome organization. A model integrating transcription factor motif affinities with epigenetic features identifies key regulators of cis-regulatory element (CRE) activation. In vivo reporter assays further decouple the intrinsic regulatory potential of CREs from context-dependent synergistic activation. Collectively, our findings uncover temporal epigenomic reprogramming that underlies the evolving differentiation potential of NSCs, providing insights into the intrinsic and extrinsic mechanisms that pattern cortical lineages.
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