DNA methylation in the IGF2 intragenic DMR is re-established in a sex-specific manner in bovine blastocysts after somatic cloning.

Abstract:

:The recent identification of an intragenic differentially methylated region (DMR) within the last exon of the bovine Insulin-like growth factor 2 (IGF2) gene provides a diagnostic tool for in-depth investigation of bovine imprinting and regulatory mechanisms which are active during embryo development. Here, we used bisulfite sequencing to compare sex-specific DNA methylation patterns within this DMR in bovine blastocysts produced in vivo, by in vitro fertilization and culture, SCNT, androgenesis or parthenogenesis. In in vivo derived embryos, DNA methylation was removed from this intragenic DMR after fertilization, but partially replaced by the time the embryo reached the blastocyst stage. Among embryos developing in vivo, the level of DNA methylation was significantly lower in female than in male blastocysts. This sexual dimorphism was also found between parthenogenetic and androgenetic embryos, and followed the donor cell sex in SCNT derived blastocysts and is evidence for correct methylation reprogramming in SCNT embryos.

journal_name

Genomics

journal_title

Genomics

authors

Gebert C,Wrenzycki C,Herrmann D,Gröger D,Thiel J,Reinhardt R,Lehrach H,Hajkova P,Lucas-Hahn A,Carnwath JW,Niemann H

doi

10.1016/j.ygeno.2009.03.004

subject

Has Abstract

pub_date

2009-07-01 00:00:00

pages

63-9

issue

1

eissn

0888-7543

issn

1089-8646

pii

S0888-7543(09)00061-5

journal_volume

94

pub_type

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