Epigenetic status of the H19 locus in human oocytes following in vitro maturation.

Abstract:

:Imprinting is an epigenetic modification that is reprogrammed in the germ line and leads to the monoallelic expression of some genes. Imprinting involves DNA methylation. Maternal imprint is reset during oocyte growth and maturation. In vitro maturation (IVM) of oocytes may, therefore, interfere with imprint acquisition and/or maintenance. To evaluate if maturing human oocytes in vitro would be hazardous at the epigenetic level, we first determined the methylation profile of the H19 differentially methylated region (DMR). The methylation status of the H19 DMR seems particularly vulnerable to in vitro culture conditions. We analyzed oocytes at different stages of maturation following IVM, germinal vesicle (GV), metaphase I (MI), and metaphase II (MII), using the bisulfite mutagenesis technique. Our results indicated that the unmethylated specific maternal profile for the H19 DMR was stably established at the GV stage. The majority of MI-arrested oocytes exhibited an altered pattern of methylation, the CTCF-binding site being methylated in half of the DNA strands analyzed. Of the 20 MII oocytes analyzed, 15 showed the normal unmethylated maternal pattern, while 5 originating from two different patients exhibited a methylated pattern. These findings highlight the need for extended analysis on MII-rescued oocytes to appreciate the epigenetic safety of the IVM procedure, before it becomes a routine and practical assisted reproductive procedure.

journal_name

Genomics

journal_title

Genomics

authors

Borghol N,Lornage J,Blachère T,Sophie Garret A,Lefèvre A

doi

10.1016/j.ygeno.2005.10.008

subject

Has Abstract

pub_date

2006-03-01 00:00:00

pages

417-26

issue

3

eissn

0888-7543

issn

1089-8646

pii

S0888-7543(05)00300-9

journal_volume

87

pub_type

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