Histone H3K9 Methyltransferase G9a in Oocytes Is Essential for Preimplantation Development but Dispensable for CG Methylation Protection

Abstract : Mammalian histone methyltransferase G9a (also called EHMT2) deposits H3K9me2 on chromatin and is essential for postimplantation development. However, its role in oogenesis and preimplantation development remains poorly understood. We show that H3K9me2-enriched chromatin domains in mouse oocytes are generally depleted of CG methylation, contrasting with their association in embryonic stem and somatic cells. Oocyte-specific disruption of G9a results in reduced H3K9me2 enrichment and impaired reorganization of heterochromatin in oocytes, but only a modest reduction in CG methylation is detected. Furthermore, in both oocytes and 2-cell embryos, G9a depletion has limited impact on the expression of genes and retrotransposons. Although their CG methylation is minimally affected, preimplantation embryos derived from such oocytes show abnormal chromosome segregation and frequent developmental arrest. Our findings illuminate the functional importance of G9a independent of CG methylation in preimplantation development and call into question the proposed role for H3K9me2 in CG methylation protection in zygotes.
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Soumis le : lundi 16 décembre 2019 - 15:15:51
Dernière modification le : vendredi 10 janvier 2020 - 15:10:19

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Wan Kin Au Yeung, Julie Brind'Amour, Yu Hatano, Kazuo Yamagata, Robert Feil, et al.. Histone H3K9 Methyltransferase G9a in Oocytes Is Essential for Preimplantation Development but Dispensable for CG Methylation Protection. Cell Reports , Elsevier Inc, 2019, 27 (1), pp.282-293.e4. ⟨10.1016/j.celrep.2019.03.002⟩. ⟨hal-02414218⟩

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