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SWI/SNF-like chromatin remodeling factor Fun30 supports point centromere function in S. cerevisiae.

PLoS genetics | Sep 2, 2012

Budding yeast centromeres are sequence-defined point centromeres and are, unlike in many other organisms, not embedded in heterochromatin. Here we show that Fun30, a poorly understood SWI/SNF-like chromatin remodeling factor conserved in humans, promotes point centromere function through the formation of correct chromatin architecture at centromeres. Our determination of the genome-wide binding and nucleosome positioning properties of Fun30 shows that this enzyme is consistently enriched over centromeres and that a majority of CENs show Fun30-dependent changes in flanking nucleosome position and/or CEN core micrococcal nuclease accessibility. Fun30 deletion leads to defects in histone variant Htz1 occupancy genome-wide, including at and around most centromeres. FUN30 genetically interacts with CSE4, coding for the centromere-specific variant of histone H3, and counteracts the detrimental effect of transcription through centromeres on chromosome segregation and suppresses transcriptional noise over centromere CEN3. Previous work has shown a requirement for fission yeast and mammalian homologs of Fun30 in heterochromatin assembly. As centromeres in budding yeast are not embedded in heterochromatin, our findings indicate a direct role of Fun30 in centromere chromatin by promoting correct chromatin architecture.

Pubmed ID: 23028372 RIS Download

Mesh terms: Centromere | Chromatin Assembly and Disassembly | Chromosomal Proteins, Non-Histone | Chromosome Segregation | DNA-Binding Proteins | Heterochromatin | Histones | Humans | Kinetochores | Nucleosomes | Saccharomyces cerevisiae | Saccharomyces cerevisiae Proteins | Transcription Factors

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Associated grants

  • Agency: Biotechnology and Biological Sciences Research Council, Id: BB_BB/F020236/1
  • Agency: Biotechnology and Biological Sciences Research Council, Id:

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