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RSC1 and RSC2 are required for expression of mid-late sporulation-specific genes in Saccharomyces cerevisiae


RSC1 and RSC2 are required for expression of mid-late sporulation-specific genes in Saccharomyces cerevisiae



Eukaryotic Cell 3(4): 910-918



ISSN/ISBN: 1535-9778

PMID: 15302824

DOI: 10.1128/ec.3.4.910-918.2004

Rsc1 and Rsc2 are alternative bromodomain-containing subunits of the ATP-dependent RSC chromatin remodeling complex in Saccharomyces cerevisiae. Smk1 is a sporulation-specific mitogen-activated protein kinase homolog that is required for the postmeiotic events of spore formation. In this study we show that RSC1 and RSC2 are haploinsufficient for spore formation in a smk1 hypomorph. Moreover, diploids lacking Rsc1 or Rsc2 show a subset of smk1-like phenotypes. High-copy-number RSC1 plasmids do not suppress rsc2-Delta/rsc2-Delta sporulation defects, and high-copy-number RSC2 plasmids do not suppress rsc1-Delta/rsc1-Delta sporulation defects. Mid-late sporulation-specific genes, which are normally expressed while key steps in spore assembly occur and which include genes that are required for spore wall formation, are not expressed in cells lacking Rsc1 or Rsc2. We speculate that the combined action of Rsc1 and Rsc2 at mid-late promoters is specifically required for the proper expression of this uniquely timed set of genes. Our data suggest that Smk1 and Rsc1/2 define parallel pathways that converge to provide signaling information and the expression of gene products, respectively, that are required for spore morphogenesis.

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Accession: 012478269

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