The DMM complex prevents spreading of DNA methylation from transposons to nearby genes in Neurospora crassa

Shinji Honda, Zachary A. Lewis, Maite Huarte, Lucy Y. Cho, Larry L. David, Yang Shi, Eric U. Selker

Research output: Contribution to journalArticle

34 Scopus citations

Abstract

Transposable elements are common in genomes and must be controlled. Many organisms use DNA methylation to silence such selfish DNA, but the mechanisms that restrict the methylation to appropriate regions are largely unknown.We identified a JmjC domain protein in Neurospora,DNA METHYLATIONMODULATOR-1 (DMM-1), that prevents aberrant spreading of DNA and histone H3K9 methylation from inactivated transposons into nearby genes. Mutation of a conserved residue within the JmjC Fe(II)-binding site abolished dmm-1 function, as did mutations in conserved cysteine-rich domains. Mutants defective only in dmm-1 mutants grow poorly, but growth is restored by reduction or elimination of DNA methylation using the drug 5-azacytosine or by mutation of the DNA methyltransferase gene dim-2. DMM-1 relies on an associated protein, DMM-2, which bears a DNA-binding motif, for localization and proper function. HP1 is required to recruit the DMM complex to the edges of methylated regions.

Original languageEnglish (US)
Pages (from-to)443-454
Number of pages12
JournalGenes and Development
Volume24
Issue number5
DOIs
StatePublished - Mar 1 2010

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Keywords

  • DNA methylation
  • HP1
  • Heterochromatin
  • Histone methylation
  • JmjC domain

ASJC Scopus subject areas

  • Genetics
  • Developmental Biology

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