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An Arabidopsis SET domain protein required for maintenance but not establishment of DNA methylation.

Authors
  • Malagnac, Fabienne
  • Bartee, Lisa
  • Bender, Judith
Type
Published Article
Journal
The EMBO journal
Publication Date
Dec 16, 2002
Volume
21
Issue
24
Pages
6842–6852
Identifiers
PMID: 12486005
Source
Medline
License
Unknown

Abstract

Cytosine methylation is critical for correct development and genome stability in mammals and plants. In order to elucidate the factors that control genomic DNA methylation patterning, a genetic screen for mutations that disrupt methylation-correlated silencing of the endogenous gene PAI2 was conducted in Arabidopsis: This screen yielded seven loss-of-function alleles in a SET domain protein with histone H3 Lys9 methyltransferase activity, SUVH4. The mutations conferred reduced cytosine methylation on PAI2, especially in non-CG sequence contexts, but did not affect methylation on another PAI locus carrying two genes arranged as an inverted repeat. Moreover, an unmethylated PAI2 gene could be methylated de novo in the suvh4 mutant background. These results suggest that SUVH4 is involved in maintenance but not establishment of methylation at particular genomic regions. In contrast, a heterochromatin protein 1 homolog, LHP1, had no effect on PAI methylation.

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