Evolutionary Epigenomic Analyses in Mammalian Early Embryos Reveal Species-specific Innovations and Conserved Principles of Imprinting

Overview

Journal Sci Adv

Specialties Biology
Science

Date 2021 Nov 24

PMID 34818044

Citations 26

Authors

Xukun Lu

Yu Zhang

Lijuan Wang

Leyun Wang

Huili Wang

Qianhua Xu

Yunlong Xiang

Chaolei Chen

Feng Kong

Weikun Xia

Zili Lin

Sinan Ma

Ling Liu

Xiangguo Wang

Hemin Ni

Wei Li

Yong Guo

Wei Xie

Affiliations

Soon will be listed here.

Abstract

While mouse remains the most popular model, the conservation of parental-to-embryonic epigenetic transition across mammals is poorly defined. Through analysis of oocytes and early embryos in human, bovine, porcine, rat, and mouse, we revealed remarkable species-specific innovations as no single animal model fully recapitulates the human epigenetic transition. In rodent oocytes, transcription-dependent DNA methylation allows methylation of maternal imprints but not intergenic paternal imprints. Unexpectedly, prevalent DNA hypermethylation, paralleled by H3K36me2/3, also occurs in nontranscribed regions in porcine and bovine oocytes, except for megabase-long “CpG continents (CGCs)” where imprinting control regions preferentially reside. Broad H3K4me3 and H3K27me3 domains exist in nonhuman oocytes, yet only rodent H3K27me3 survives beyond genome activation. Coincidently, regulatory elements preferentially evade H3K27me3 in rodent oocytes, and failure to do so causes aberrant embryonic gene repression. Hence, the diverse mammalian innovations of parental-to-embryonic transition center on a delicate “to-methylate-or-not” balance in establishing imprints while protecting other regulatory regions.

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