Bisulfite sequencing in preimplantation embryos: DNA methylation profile of the upstream region of the mouse imprinted H19 gene.

Abstract:

:In this study we describe a modification of the bisulfite genomic sequencing protocol that enables detection of methylation from as few as five diploid cells from preimplantation mouse embryos. We have used bisulfite genomic sequencing to study the methylation profile of the putative imprinting element upstream of the mouse H19 gene at several stages of embryonic development, including fertilized oocytes and two-cell embryos. The methylation of the H19 imprinting element has recently been described extensively for midgestation embryos, but remains poorly characterized for the preimplantation stages of development, despite widespread changes in genomic DNA methylation occurring at this time. We studied the methylation profile of 35 CpG sites spanning two regions within the H19 imprinting element and found that an overall pattern of allele-specific methylation was maintained at all developmental stages examined, including fertilized oocytes and two-cell embryos. However, allele-specific methylation was not maintained in an absolute fashion subsequent to the first cell division, with a clear flux between partial de novo methylation of the maternal allele and partial demethylation of the paternal allele. Our findings highlight the dynamics of methylation in the early embryo and suggest that it is the overall level of methylation that is responsible for maintenance of the imprinting element and not the methylation of individual CpG sites.

journal_name

Genomics

journal_title

Genomics

authors

Warnecke PM,Mann JR,Frommer M,Clark SJ

doi

10.1006/geno.1998.5371

subject

Has Abstract

pub_date

1998-07-15 00:00:00

pages

182-90

issue

2

eissn

0888-7543

issn

1089-8646

pii

S0888-7543(98)95371-X

journal_volume

51

pub_type

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