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Resistance of IAPs to methylation reprogramming may provide a mechanism for epigenetic inheritance in the mouse
Author(s) -
Lane Natasha,
Dean Wendy,
Erhardt Sylvia,
Hajkova Petra,
Surani Azim,
Walter Jörn,
Reik Wolf
Publication year - 2003
Publication title -
genesis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.093
H-Index - 110
eISSN - 1526-968X
pISSN - 1526-954X
DOI - 10.1002/gene.10168
Subject(s) - reprogramming , biology , epigenetics , dna methylation , methylation , genetics , genomic imprinting , demethylation , dna demethylation , bisulfite sequencing , gene , gene expression
Abstract Summary: Genome‐wide epigenetic reprogramming by demethylation occurs in early mouse embryos and primordial germ cells. In early embryos many single‐copy sequences become demethylated both by active and passive demethylation, whereas imprinted gene methylation remains unaffected. In primordial germ cells single‐copy and imprinted sequences are demethylated, presumably by active demethylation. Here we investigated systematically by bisulphite sequencing the methylation profiles of IAP and Line1 repeated sequence families during preimplantation and primordial germ cell development. Whereas Line1 elements were substantially demethylated during both developmental periods, IAP elements were largely resistant to demethylation, particularly during preimplantation development. This may be desirable in order to prevent IAP retrotransposition, which could cause mutations. In turn, this can result in the transgenerational inheritance of epigenetic states of IAPs, which could lead to heritable epimutations of neighbouring genes through influencing their transcriptional states. genesis 35:88–93, 2003. © 2003 Wiley‐Liss, Inc.