Requirement of CHROMOMETHYLASE3 for maintenance of CpXpG methylation - PubMed (original) (raw)
. 2001 Jun 15;292(5524):2077-80.
doi: 10.1126/science.1059745. Epub 2001 May 10.
Affiliations
- PMID: 11349138
- DOI: 10.1126/science.1059745
Requirement of CHROMOMETHYLASE3 for maintenance of CpXpG methylation
A M Lindroth et al. Science. 2001.
Abstract
Epigenetic silenced alleles of the Arabidopsis SUPERMAN locus (the clark kent alleles) are associated with dense hypermethylation at noncanonical cytosines (CpXpG and asymmetric sites, where X = A, T, C, or G). A genetic screen for suppressors of a hypermethylated clark kent mutant identified nine loss-of-function alleles of CHROMOMETHYLASE3 (CMT3), a novel cytosine methyltransferase homolog. These cmt3 mutants display a wild-type morphology but exhibit decreased CpXpG methylation of the SUP gene and of other sequences throughout the genome. They also show reactivated expression of endogenous retrotransposon sequences. These results show that a non-CpG DNA methyltransferase is responsible for maintaining epigenetic gene silencing.
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