Reverse genetic analysis of the yeast RSC chromatin remodeler reveals a role for RSC3 and SNF5 homolog 1 in ploidy maintenance

被引：36

作者：

Campsteijn, Coen ^{[1
]}

Wijnands-Collin, Anne-Marie J. ^{[1
]}

Logie, Colin ^{[1
]}

机构：

[1] Radboud Univ Nijmegen, Nijmegen Ctr Mol Life Sci, Dept Mol Biol, Nijmegen, Netherlands

来源：

PLOS GENETICS | 2007年 / 3卷 / 06期

关键词：

D O I：

10.1371/journal.pgen.0030092

中图分类号：

Q3 [遗传学];

学科分类号：

071007 ; 090102 ;

摘要：

The yeast "remodels the structure of chromatin'' ( RSC) complex is a multi-subunit "switching deficient/sucrose nonfermenting'' type ATP-dependent nucleosome remodeler, with human counterparts that are well- established tumor suppressors. Using temperature- inducible degron fusions of all the essential RSC subunits, we set out to map RSC requirement as a function of the mitotic cell cycle. We found that RSC executes essential functions during G1, G2, and mitosis. Remarkably, we observed a doubling of chromosome complements when degron alleles of the RSC subunit SFH1, the yeast hSNF5 tumor suppressor ortholog, and RSC3 were combined. The requirement for simultaneous deregulation of SFH1 and RSC3 to induce these ploidy shifts was eliminated by knockout of the S-phase cyclin CLB5 and by transient depletion of replication origin licensing factor Cdc6p. Further, combination of the degron alleles of SFH1 and RSC3, with deletion alleles of each of the nine Cdc28/Cdk1-associated cyclins, revealed a strong and specific genetic interaction between the S-phase cyclin genes CLB5 and RSC3, indicating a role for Rsc3p in proper S-phase regulation. Taken together, our results implicate RSC in regulation of the G1/S-phase transition and establish a hitherto unanticipated role for RSC- mediated chromatin remodeling in ploidy maintenance.

引用

页码：947 / 957

页数：11

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