Protosilencers in Saccharomyces cerevisiae subtelomeric regions.

Genetics
E LebrunGenevieve Fourel

Abstract

Saccharomyces cerevisiae subtelomeric repeats contain silencing elements such as the core X sequence, which is present at all chromosome ends. When transplaced at HML, core X can enhance the action of a distant silencer without acting as a silencer on its own, thus fulfilling the functional definition of a protosilencer. Here we show that an ACS motif and an Abf1p-binding site participate in the silencing capacity of core X and that their effects are additive. In addition, in a variety of settings, core X was found to bring about substantial gene repression only when a low level of silencing was already detectable in its absence. Adjoining an X-STAR sequence, which naturally abuts core X in subtelomeric regions, did not improve the silencing capacity of core X. We propose that protosilencers play a major role in a variety of silencing phenomena, as is the case for core X, which acts as a silencing relay, prolonging silencing propagation away from telomeres.

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Citations

Sep 18, 2007·Biochimie·Alexandre OttavianiFrédérique Magdinier
Sep 5, 2002·BioEssays : News and Reviews in Molecular, Cellular and Developmental Biology·Geneviève FourelEric Gilson
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Sep 11, 2013·Annual Review of Genetics·Stephanie KuengSusan M Gasser
Aug 30, 2002·The Journal of Biological Chemistry·Genevieve FourelEric Gilson

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