Formation of a heterochromatin-like structure results in transcriptional silencing at the HM mating-type loci and telomeres in Saccharomyces cerevisiae1,2,3. Once formed, such epigenetically determined structures are inherited for many mitotic divisions4. Here we show that mutations in the proliferating cell nuclear antigen (PCNA), an essential component at the DNA replication fork5, reduced repression of genes near a telomere and at the silent mating-type locus, HMR. The pol30-8 mutant displayed coexistence of both repressed (pink) and de-repressed (white) cells within a single colony when assayed with the ADE2 gene inserted at HMR. Unlike pol30-8, the pol30-6 and pol30-79 mutants partially reduced gene silencing at telomeres and the HMR and synergistically decreased silencing in cells lacking chromatin assembly factor 1 (CAF-1). All silencing defective mutants showed reduced binding to CAF-1 in vitro and altered chromatin association of the CAF-1 large subunit in vivo. Thus, PCNA participates in inheritance of both DNA and epigenetic chromatin structures during the S phase of the cell cycle, the latter by at least two mechanisms.
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We thank P. Burgers, P. Kaufman, R. Sternglanz and D. Shore for plasmids and yeast strains used in this study. We thank A. Stenlund for critical reading of the manuscript, T. Tully for statistical analysis of the data presented in Table 1, and members of the Stillman laboratory, especially L. Zou, for helpful discussions. This work is supported by a grant from the National Institutes of Health (to B. S.). Z. Z. is supported by a postdoctoral fellowship from the Cancer Research Fund of the Damon Runyon-Walter Winchell Foundation. K. S. is a Leukemia Society of America Special Fellow.
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