Transcriptional silencing in yeast is associated with reduced nucleosome acetylation

Miriam Braunstein, Alan B. Rose, Scott G. Holmes, C. David Allis, James Broach

Research output: Contribution to journalArticle

678 Citations (Scopus)

Abstract

Two classes of sequences in the yeast Saccharomyces cerevisiae are subject to transcriptional silencing: the silent mating-type cassettes and telomeres. In this report we demonstrate that the silencing of these regions is strictly associated with acetylation of the ε-amino groups of lysines in the amino-terminal domains of three of the four core histones. Both the silent mating-type cassettes and the Y domains of telomeres are packaged in nucleosomes in vivo that are hypoacetylated relative to those packaging active genes. This difference in acetylation is eliminated by genetic inactivation of silencing: The silent cassettes from sir2, sir3, or sir4 cells show the same level of acetylation as other active genes. The correspondence of silencing and hypoacetylation of the mating-type cassettes is observed even for an allele lacking a promoter, indicating that silencing per se, rather than the absence of transcription, is correlated with hypoacetylation. Finally, overexpression of Sir2p, a protein required for transcriptional silencing in yeast, yields substantial histone deacetylation in vivo. These studies fortify the hypothesis that silencing in yeast results from heterochromatin formation and argue that the silencing proteins participate in this formation.

Original languageEnglish (US)
Pages (from-to)592-604
Number of pages13
JournalGenes and Development
Volume7
Issue number4
DOIs
StatePublished - Jan 1 1993

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Nucleosomes
Acetylation
Yeasts
Telomere
Histones
Heterochromatin
Product Packaging
Genes
Lysine
Saccharomyces cerevisiae
Proteins
Alleles

All Science Journal Classification (ASJC) codes

  • Genetics
  • Developmental Biology

Cite this

Braunstein, Miriam ; Rose, Alan B. ; Holmes, Scott G. ; David Allis, C. ; Broach, James. / Transcriptional silencing in yeast is associated with reduced nucleosome acetylation. In: Genes and Development. 1993 ; Vol. 7, No. 4. pp. 592-604.
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Transcriptional silencing in yeast is associated with reduced nucleosome acetylation. / Braunstein, Miriam; Rose, Alan B.; Holmes, Scott G.; David Allis, C.; Broach, James.

In: Genes and Development, Vol. 7, No. 4, 01.01.1993, p. 592-604.

Research output: Contribution to journalArticle

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