PCGF1/PRC1.1 selectively sustains astroglial lineage progression by repressing N4bp1 to stabilize Notch signaling.

Conditional deletion of Pcgf1 in the dorsal forebrain selectively impairs cortical astrocyte generation, reducing SOX9+, BLBP+, GFAP+, and ALDH1L1+ populations while leaving neurogenesis and gliogenic progenitors largely unchanged.

• Why it matters: Epigenetic control of progenitor competence to respond to Notch-driven astrocyte differentiation is unclear, limiting understanding of how chromatin regulators tune lineage-specific signaling output.
• What they did: The study used conditional Pcgf1 loss in the dorsal forebrain and measured astroglial-state markers, then tested mechanism by showing PCGF1 directly represses N4bp1 to affect NICD stability and Notch signaling.
• The result: Pcgf1 deficiency upregulates N4bp1, destabilizes NICD, and attenuates Notch signaling, while N4bp1 deletion produces the opposite astroglial phenotype, defining a PCGF1–N4BP1–Notch axis.

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