Global chromatin structure of 45,000 base pairs of chromosome III in a- and α-cell yeast and during mating-type switching

Sevinc Ercan, Robert T. Simpson

Research output: Contribution to journalArticle

Abstract

Directionality of yeast mating-type switching has been attributed to differences in chromatin structure for the left arm of chromosome III. We have mapped the structure of ∼45 kbp of the left arm of chromosome III in a and α cells in logarithmically growing cultures and in a cells during switching. Distinctive features of chromatin structure were the occurrence of DNase I-hypersensitive sites in the promoter region of nearly every gene and some replication origins and the presence of extended regions of positioned nucleosomes in ∼25% of the open reading frames. Other than the recombination enhancer, chromatin structures were identical in the two cell types. Changes in chromatin structure during switching were confined to the recombination enhancer. This unbiased analysis of an extended region of chromatin reveals that significant features of organized chromatin exist for the entire region, and these features are largely static with respect to mating type and mating-type switching. Our analysis also shows that primary chromatin structure does not cause the documented differences in recombinational frequency of the left arm of chromosome III in yeast a and α cells.

Original languageEnglish (US)
Pages (from-to)10026-10035
Number of pages10
JournalMolecular and Cellular Biology
Volume24
Issue number22
DOIs
StatePublished - Nov 2004

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Base Pairing
Chromatin
Chromosomes
Yeasts
Genetic Recombination
Replication Origin
Nucleosomes
Deoxyribonuclease I
Genetic Promoter Regions
Open Reading Frames
Genes

ASJC Scopus subject areas

  • Cell Biology
  • Genetics
  • Molecular Biology

Cite this

Global chromatin structure of 45,000 base pairs of chromosome III in a- and α-cell yeast and during mating-type switching. / Ercan, Sevinc; Simpson, Robert T.

In: Molecular and Cellular Biology, Vol. 24, No. 22, 11.2004, p. 10026-10035.

Research output: Contribution to journalArticle

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