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Updated: May 16, 2026

An Engineered Split-TET2 Enzyme for Chemical-inducible DNA Hydroxymethylation and Epigenetic Remodeling
Published on: December 18, 2017
Replication-coupled passive DNA demethylation for the erasure of genome imprints in mice
Saya Kagiwada1, Kazuki Kurimoto, Takayuki Hirota
1Department of Anatomy and Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto 606-8501, Japan.
Abstract:
Genome-wide DNA demethylation, including the erasure of genome imprints, in primordial germ cells (PGCs) is a critical first step to creating a totipotent epigenome in the germ line. We show here that, contrary to the prevailing model emphasizing active DNA demethylation, imprint erasure in mouse PGCs occurs in a manner largely consistent with replication-coupled passive DNA demethylation: PGCs erase imprints during their rapid cycling with little de novo or maintenance DNA methylation potential and no apparent major chromatin alterations. Our findings necessitate the re-evaluation of and provide novel insights into the mechanism of genome-wide DNA demethylation in PGCs.
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