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Related Experiment Videos

Structural and dynamic functions establish chromatin domains.

Kojiro Ishii1, Ulrich K Laemmli

  • 1Department of Biochemistry, NCCR Frontiers of Genetics, University of Geneva, 30, Quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland. ulrich.laemmli@molbio.unige.ch

Molecular Cell
|January 22, 2003
PubMed
Summary
This summary is machine-generated.

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Gene silencing in yeast is prevented by boundary activities (BAs) and desilencing activities (DAs). Both mechanisms, involving Drosophila and mammalian proteins, establish distinct chromatin domains, ensuring genetic autonomy.

Area of Science:

  • * Molecular Biology
  • * Genetics
  • * Epigenetics

Background:

  • * Heterochromatic repression silences genes in Saccharomyces cerevisiae.
  • * Drosophila and mammalian proteins can counteract this silencing.
  • * Two distinct mechanisms, boundary activities (BAs) and desilencing activities (DAs), are involved.

Purpose of the Study:

  • * To investigate the mechanisms by which Drosophila and mammalian proteins protect genes from heterochromatic repression in yeast.
  • * To differentiate between genuine boundary activities (BAs) and desilencing activities (DAs).
  • * To understand how these activities affect telomere-linked gene silencing.

Main Methods:

  • * Functional assays in Saccharomyces cerevisiae to test protein activities.
  • * Characterization of boundary and desilencing activities of various proteins, including BEAF, Sp1, CTCF, GAGA factor, and Gcn5p.

Related Experiment Videos

  • * Assessment of protection against telomere-linked gene silencing.

    • Main Results:

    • * Drosophila BEAF and mammalian Sp1 demonstrated robust boundary activities (BAs) in yeast.
    • * Mammalian CTCF, Drosophila GAGA factor, yeast Gcn5p, and several mammalian transcription factors functioned as desilencing activities (DAs).
    • * Desilencing activities (DAs), but not boundary activities (BAs), protected telomere-linked genes from silencing, likely due to telomere looping.

    Conclusions:

    • * Chromatin domains are protected from silencing by two distinct mechanisms: unidirectional BAs and bidirectional DAs.
    • * Desilencing activities (DAs) play a crucial role in protecting telomere-associated genes.
    • * Both passive and active mechanisms contribute to establishing the "genetic autonomy" of chromatin domains.