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Mol. Cell. Biol. doi:10.1128/MCB.01647-07
Copyright (c) 2008, American Society for Microbiology and/or the Listed Authors/Institutions. All Rights Reserved.

Long-range communication between the silencers of HMR

Department of Pharmacology, 683 Hoes Lane, UMDNJ-Robert Wood Johnson Medical School, Piscataway, NJ 08854; Department of MCD Biology, Sinsheimer Labs, 1156 High Street, University of California, Santa Cruz, CA 95064

^* To whom correspondence should be addressed. Email: rohinton{at}biology.ucsc.edu.

	Abstract

Gene regulation involves long-range communication between silencers, enhancers and promoters. In Saccharomyces cerevisiae, silencers flank transcriptionally repressed genes to mediate regional silencing. Silencers recruit the Sir proteins, which then spread along chromatin to encompass the entire silenced domain. In this report we have employed a boundary trap assay, an enhancer activity assay, chromatin immunoprecipitations and chromosome conformation capture analyses to demonstrate that the two HMR silencer elements are in close proximity and functionally communicate with one another in vivo. We further show that silencing is necessary for these long-range interactions and we present models for Sir-mediated silencing based upon these results.