Acetylation at lysine 27 on maternal H3.3 regulates minor zygotic genome activation.

ABSTRACT: Zygotic genome activation (ZGA) initiates transcription in early embryogenesis and requires extensive chromatin remodeling, including rapid incorporation of the histone variant H3.3. The distinct sources of H3.3 from paternal and maternal alleles (paH3.3 and maH3.3) complicate tracking their individual contributions. Here, using an H3.3B-hemagglutinin (HA)-tagged mouse model, we profile the temporal dynamics of paH3.3 and maH3.3, revealing a unique pattern of maH3.3 enrichment at the promoter regions from zygotes to 2-cell embryos, highlighting the crucial role of maternally stored H3.3 mRNAs and proteins (mH3.3) in pre-implantation development. Knockdown of mH3.3 compromises cleavage and minor ZGA. Mechanistically, mH3.3 facilitates minor ZGA through H3.3S31ph-dependent H3K27ac deposition

SUBMITTER: Zhang J 

PROVIDER: S-EPMC11892348 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature