Background: Structural changes in chromatin play essential roles in regulating eukaryotic gene expression. Silencing, potent repression of transcription in Saccharomyces cerevisiae, occurs near telomeres and at the silent mating-type loci, as well as at rDNA loci. This type of repression relates to the condensation of chromatin that occurs in the heterochromatin of multicellular organisms. Anti-silencing is a reaction by which silenced loci are de-repressed. Genetic studies revealed that several factors participate in the anti-silencing reaction. However, actions of factors and molecular mechanisms underlying anti-silencing remain unknown.
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