

MCM2-2A mutation challenged dynamic transitions in cellular states across the cell cycle, enhancing naïve pluripotency and reducing lineage priming in G1. Moreover, H3K9me3 loss at repeats caused derepression and H3K27me3 redistribution across bivalent promoters correlated with misexpression of developmental genes. This included widespread spurious deposition of repressive modifications, suggesting elevated epigenetic noise. Asymmetric segregation of parental histones H3-H4 in MCM2-2A mutants compromised mitotic inheritance of histone modifications and globally altered the epigenome. Here we show that transmission of histone-based information during DNA replication maintains epigenome fidelity and embryonic stem cell plasticity. How this may sustain the epigenome and cell identity remains unknown. Modified parental histones are segregated symmetrically to daughter DNA strands during replication and can be inherited through mitosis.

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