Identification of noncoding transcripts from within CENP-A chromatin at fission yeast centromeres

J Biol Chem. 2011 Jul 1;286(26):23600-7. doi: 10.1074/jbc.M111.228510. Epub 2011 Apr 28.

Abstract

The histone H3 variant CENP-A is the most favored candidate for an epigenetic mark that specifies the centromere. In fission yeast, adjacent heterochromatin can direct CENP-A(Cnp1) chromatin establishment, but the underlying features governing where CENP-A(Cnp1) chromatin assembles are unknown. We show that, in addition to centromeric regions, a low level of CENP-A(Cnp1) associates with gene promoters where histone H3 is depleted by the activity of the Hrp1(Chd1) chromatin-remodeling factor. Moreover, we demonstrate that noncoding RNAs are transcribed by RNA polymerase II (RNAPII) from CENP-A(Cnp1) chromatin at centromeres. These analyses reveal a similarity between centromeres and a subset of RNAPII genes and suggest a role for remodeling at RNAPII promoters within centromeres that influences the replacement of histone H3 with CENP-A(Cnp1).

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Centromere / genetics
  • Centromere / metabolism*
  • Chromatin Assembly and Disassembly / physiology*
  • Chromosomal Proteins, Non-Histone*
  • Heterochromatin / genetics
  • Heterochromatin / metabolism
  • Promoter Regions, Genetic / physiology*
  • RNA Polymerase II / genetics
  • RNA Polymerase II / metabolism
  • RNA, Fungal / biosynthesis*
  • RNA, Fungal / genetics
  • Schizosaccharomyces / genetics
  • Schizosaccharomyces / metabolism*
  • Schizosaccharomyces pombe Proteins*
  • Transcription, Genetic / physiology

Substances

  • Chromosomal Proteins, Non-Histone
  • Cnp1 protein, S pombe
  • Heterochromatin
  • RNA, Fungal
  • Schizosaccharomyces pombe Proteins
  • RNA Polymerase II