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H2A.Z is essential for maternal H3K4me3 establishment and meiotic progression in mouse oocytes [RNA-Seq]

ABSTRACT: A unique landscape of histone modifications is established during mouse oogenesis. For example, H3K4me3 forms noncanonically broad domains (ncH3K4me3) at intergenic regions in transcriptionally quiescent fully grown oocytes (FGOs), which are briefly transmitted to early embryos. How such a unique landscape of histone modification is established during oogenesis remains to be elucidated. Here we examine the distributions of histone H2A variants and the roles of H2A.Z in ncH3K4me3 establishment in mouse oocytes. We show that H2A.Z is broadly distributed at distal regions, along with ncH3K4me3, in FGOs, whereas H2A, H2A.X, and TH2A are evenly distributed throughout the genome. Temporal profiling of H2A.Z distributions during oocyte growth reveals that noncanonically broad H2A.Z (ncH2A.Z) is established at the end of oocyte growth, concomitantly with ncH3K4me3 establishment. Depletion of H2A.Z by oocyte-specific conditional double knockout of H2A.Z.1 and H2A.Z.2 impairs ncH3K4me3 establishment and meiotic progression, resembling Mll2 KO oocytes. Moreover, depletion of ncH3K4me3 also causes loss of ncH2A.Z in Mll2 KO FGOs, indicating that ncH2A.Z and ncH3K4me3 are mutually dependent. Thus, our study reveals the critical role of H2A.Z in proper establishment of the maternal epigenome and oocyte development.

ORGANISM(S): Mus musculus

PROVIDER: GSE262049 | GEO | 2025/03/01

REPOSITORIES: GEO

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H2A.Z is essential for maternal H3K4me3 establishment and meiotic progression in mouse oocytes.

Project description:A unique landscape of histone modifications is established during mouse oogenesis. For example, H3K4me3 forms noncanonically broad domains (ncH3K4me3) at intergenic regions in transcriptionally quiescent fully grown oocytes (FGOs), which are briefly transmitted to early embryos. How such a unique landscape of histone modification is established during oogenesis remains to be elucidated. Here we examine the distributions of histone H2A variants and the roles of H2A.Z in ncH3K4me3 establishment in mouse oocytes. We show that H2A.Z is broadly distributed at distal regions, along with ncH3K4me3, in FGOs, whereas H2A, H2A.X, and TH2A are evenly distributed throughout the genome. Temporal profiling of H2A.Z distributions during oocyte growth reveals that noncanonically broad H2A.Z (ncH2A.Z) is established at the end of oocyte growth, concomitantly with ncH3K4me3 establishment. Depletion of H2A.Z by oocyte-specific conditional double knockout of H2A.Z.1 and H2A.Z.2 impairs ncH3K4me3 establishment and meiotic progression, resembling Mll2 KO oocytes. Moreover, depletion of ncH3K4me3 also causes loss of ncH2A.Z in Mll2 KO FGOs, indicating that ncH2A.Z and ncH3K4me3 are mutually dependent. Thus, our study reveals the critical role of H2A.Z in proper establishment of the maternal epigenome and oocyte development.

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