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Related Experiment Videos

An uncertain silence

J M Sherman1, L Pillus

  • 1Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder 80309-0347, USA. shermanj@stripe.colorado.edu

Trends in Genetics : TIG
|August 1, 1997
PubMed
Summary
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Transcriptional silencing in yeast, a key epigenetic process, is now identified at new locations beyond mating-type loci and telomeres. Differential regulation suggests complex mechanisms and potentially more undiscovered silenced genes.

Area of Science:

  • Epigenetics and Molecular Biology
  • Yeast Genetics and Genomics

Background:

  • Transcriptional silencing is a well-established epigenetic phenomenon in yeast.
  • Recent studies reveal silencing at previously unidentified loci in Saccharomyces cerevisiae.
  • Known silenced regions include mating-type loci, telomeres, and ribosomal DNA genes.

Purpose of the Study:

  • To investigate the newly identified loci of transcriptional silencing in yeast.
  • To understand the factors and mechanisms regulating differential silencing efficiency.
  • To explore the potential for additional undiscovered silenced loci.

Main Methods:

  • Analysis of epigenetic modifications and gene expression patterns.
  • Investigating protein complexes involved in acetylation and deacetylation.

Related Experiment Videos

  • Comparative genomics to identify conserved gene families related to silencing.

    • Main Results:

    • Transcriptional silencing confirmed at novel loci, including ribosomal DNA and potential aging loci.
    • Silencing efficiency varies across loci, influenced by inter-locus competition.
    • Distinct protein complexes mediate silencing, involving acetylation and deacetylation modulators.

    Conclusions:

    • The epigenetic landscape of transcriptional silencing in yeast is more complex than previously understood.
    • Conserved gene families suggest sophisticated regulatory mechanisms for differential silencing.
    • Further research is warranted to discover additional silenced loci and their functional significance.