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Maintenance of genomic methylation requires a SWI2/SNF2-like protein.

Abstract：

:Altering cytosine methylation by genetic means leads to a variety of developmental defects in mice, plants and fungi. Deregulation of cytosine methylation also has a role in human carcinogenesis. In some cases, these defects have been tied to the inheritance of epigenetic alterations (such as chromatin imprints and DNA methylation patterns) that do not involve changes in DNA sequence. Using a forward genetic screen, we identified a gene (DDM1, decrease in DNA methylation) from the flowering plant Arabidopsis thaliana required to maintain normal cytosine methylation patterns. Additional ddm1 alleles (som4, 5, 6, 7, 8) were isolated in a selection for mutations that relieved transgene silencing (E.J.R., unpublished data). Loss of DDM1 function causes a 70% reduction of genomic cytosine methylation, with most of the immediate hypomethylation occurring in repeated sequences. In contrast, many low-copy sequences initially retain their methylation in ddm1 homozygotes, but lose methylation over time as the mutants are propagated through multiple generations by self-pollination. The progressive effect of ddm1 mutations on low-copy sequence methylation suggests that ddm1 mutations compromise the efficiency of methylation of newly incorporated cytosines after DNA replication. In parallel with the slow decay of methylation during inbreeding, ddm1 mutants accumulate heritable alterations (mutations or stable epialleles) at dispersed sites in the genome that lead to morphological abnormalities. Here we report that DDM1 encodes a SWI2/SNF2-like protein, implicating chromatin remodelling as an important process for maintenance of DNA methylation and genome integrity.

journal_name

Nat Genet

journal_title

Nature genetics

authors

Jeddeloh JA,Stokes TL,Richards EJ

doi

10.1038/8803

keywords:

subject

Has Abstract

pub_date

1999-05-01 00:00:00

pages

94-7

issue

1

eissn

1061-4036

issn

1546-1718

journal_volume

22

pub_type

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