Generation and Replication-dependent Dilution of 5fC and 5caC During Mouse Preimplantation Development

Overview

Journal Cell Res

Specialty Cell Biology

Date 2011 Nov 30

PMID 22124233

Citations 140

Authors

Azusa Inoue

Li Shen

Qing Dai

Chuan He

Yi Zhang

Affiliations

Soon will be listed here.

Abstract

One of the recent advances in the epigenetic field is the demonstration that the Tet family of proteins are capable of catalyzing conversion of 5-methylcytosine (5mC) of DNA to 5-hydroxymethylcytosine (5hmC). Interestingly, recent studies have shown that 5hmC can be further oxidized by Tet proteins to generate 5-formylcytosine (5fC) and 5-carboxylcytosine (5caC), which can be removed by thymine DNA glycosylase (TDG). To determine whether Tet-catalyzed conversion of 5mC to 5fC and 5caC occurs in vivo in zygotes, we generated antibodies specific for 5fC and 5caC. By immunostaining, we demonstrate that loss of 5mC in the paternal pronucleus is concurrent with the appearance of 5fC and 5caC, similar to that of 5hmC. Importantly, instead of being quickly removed through an enzyme-catalyzed process, both 5fC and 5caC exhibit replication-dependent dilution during mouse preimplantation development. These results not only demonstrate the conversion of 5mC to 5fC and 5caC in zygotes, but also indicate that both 5fC and 5caC are relatively stable and may be functional during preimplantation development. Together with previous studies, our study suggests that Tet-catalyzed conversion of 5mC to 5hmC/5fC/5caC followed by replication-dependent dilution accounts for paternal DNA demethylation during preimplantation development.

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