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Faithful transmission or restoration of epigenetic information such as repressive histone modifications through generations is critical for the maintenance of cell identity. We report here that chromodomain Y-like protein (CDYL), a chromodomain-containing transcription corepressor, is physically associated with chromatin assembly factor 1 (CAF-1) and the replicative helicase MCM complex. We showed that CDYL bridges CAF-1 and MCM, facilitating histone transfer and deposition during DNA replication. We demonstrated that CDYL recruits histone-modifying enzymes G9a, SETDB1, and EZH2 to replication forks, leading to the addition of H3K9me2/3 and H3K27me2/3 on newly deposited histone H3. Significantly, depletion of CDYL impedes early S phase progression and sensitizes cells to DNA damage. Our data indicate that CDYL plays an important role in the transmission/restoration of repressive histone marks, thereby preserving the epigenetic landscape for the maintenance of cell identity.

Chromodomain protein CDYL is required for transmission/restoration of repressive histone marks