Dynamic CpG island methylation landscape in oocytes and preimplantation embryos.

Abstract:

:Elucidating how and to what extent CpG islands (CGIs) are methylated in germ cells is essential to understand genomic imprinting and epigenetic reprogramming. Here we present, to our knowledge, the first integrated epigenomic analysis of mammalian oocytes, identifying over a thousand CGIs methylated in mature oocytes. We show that these CGIs depend on DNMT3A and DNMT3L but are not distinct at the sequence level, including in CpG periodicity. They are preferentially located within active transcription units and are relatively depleted in H3K4me3, supporting a general transcription-dependent mechanism of methylation. Very few methylated CGIs are fully protected from post-fertilization reprogramming but, notably, the majority show incomplete demethylation in embryonic day (E) 3.5 blastocysts. Our study shows that CGI methylation in gametes is not entirely related to genomic imprinting but is a strong factor in determining methylation status in preimplantation embryos, suggesting a need to reassess mechanisms of post-fertilization demethylation.

journal_name

Nat Genet

journal_title

Nature genetics

authors

Smallwood SA,Tomizawa S,Krueger F,Ruf N,Carli N,Segonds-Pichon A,Sato S,Hata K,Andrews SR,Kelsey G

doi

10.1038/ng.864

subject

Has Abstract

pub_date

2011-06-26 00:00:00

pages

811-4

issue

8

eissn

1061-4036

issn

1546-1718

pii

ng.864

journal_volume

43

pub_type

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