Genomic structure and parent-of-origin-specific methylation of Peg1.

Abstract:

:We previously identified Peg1/Mest as a novel paternally expressed gene in the developing mouse embryo. The human PEG1 gene was recently assigned to 7q32 and shown to be imprinted and paternally expressed. Therefore, PEG1 deficiency could participate in the aetiology of pre- and post-natal growth retardation associated with maternal uniparental disomy 7 in humans. We have now initiated the characterization of the Peg1 locus in order to identify and dissect cis-acting elements implicated in its imprinted monoallelic expression. The genomic structure of Peg1 as well as the DNA sequence of the 5'-end of the gene, including 2.4 kb of promoter sequences and covering the first 2 exons, have been determined. Important sequence elements, such as a CpG island spanning exon 1 and direct repeats, are identified and discussed. To address the role of epigenetic modifications in the imprinting of Peg1, a methylation analysis of the Peg1 gene is presented. Partially methylated cytosine residues in 13.5 d.p.c. embryos and undifferentiated ES cells were identified. Using embryos carrying a targetted mutation at the Peg1 locus, we show that this partial promoter methylation pattern reflects a strict parent-of-origin-specific differential methylation: the expressed paternal allele is unmethylated, whereas the silenced maternal allele is fully methylated at the CpG sites studied. That the gametes carry the epigenetic information necessary to lay down this allele-specific methylation pattern is suggested by analysis of DNA isolated from sperm and parthenogenetic embryos.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Lefebvre L,Viville S,Barton SC,Ishino F,Surani MA

doi

10.1093/hmg/6.11.1907

subject

Has Abstract

pub_date

1997-10-01 00:00:00

pages

1907-15

issue

11

eissn

0964-6906

issn

1460-2083

pii

dda226

journal_volume

6

pub_type

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