A high-resolution map of nucleosome positioning on a fission yeast centromere

Jun S. Song, Xingkun Liu, X. Shirley Liu, Xiangwei He

Research output: Contribution to journalArticlepeer-review

Abstract

A key element for defining the centromere identity is the incorporation of a specific histone H3, CENPA, known as Cnp1p in Schizosaccharomyces pombe. Previous studies have suggested that functional S. pombe centromeres lack regularly positioned nucleosomes and may involve chromatin remodeling as a key step of kinetochore assembly. We used tiling microarrays to show that nucleosomes are, in fact, positioned in regular intervals in the core of centromere 2, providing the first high-resolution map of regional centromere chromatin. Nucleosome locations are not disrupted by mutations in kinetochore protein genes cnp1, mis18, mis12, nuf2, mal2; overexpression of cnp1; or the deletion of ams2, which encodes a GATA-like factor participating in CENPA incorporation. Bioinformatics analysis of the centromere sequence indicates certain enriched motifs in linker regions between nucleosomes and reveals a sequence bias in nucleosome positioning. In addition, sequence analysis of nucleosome-free regions identifies novel binding sites of Ams2p. We conclude that centromeric nucleosome positions are stable and may be derived from the underlying DNA sequence.

Original languageEnglish (US)
Pages (from-to)1064-1072
Number of pages9
JournalGenome Research
Volume18
Issue number7
DOIs
StatePublished - Jul 2008
Externally publishedYes

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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