Isw1 acts independently of the Isw1a and Isw1b complexes in regulating transcriptional silencing at the ribosomal DNA locus in Saccharomyces cerevisiae.

ABSTRACT: Transcriptional silencing of Pol II-transcribed genes in Saccharomyces cerevisiae occurs at the HM loci, telomeres and ribosomal DNA (rDNA) locus. Gene silencing at these loci requires histone-modifying enzymes as well as factors that regulate local chromatin structure. Previous work has shown that the ATP-dependent chromatin remodeling protein Isw1 is required for silencing of a marker gene inserted at the HMR locus, but not at telomeres. Here we show that Isw1 is required for transcriptional silencing of Pol II-transcribed genes in the ribosomal DNA locus. Our results indicate that Isw1 associates with the rDNA and that this interaction is not altered in cells lacking other members of the Isw1a and Isw1b chromatin remodeling complexes. Further, the association of Isw1 with the rDNA is no

SUBMITTER: Mueller JE 

PROVIDER: S-EPMC1995125 | biostudies-literature | 2007 Aug

REPOSITORIES: biostudies-literature