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Manipulation and Analysis of Cell Cycle-Dependent Processes in Budding Yeast
Published on: September 26, 2025
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The budding yeast RSC complex maintains ploidy by promoting spindle pole body insertion
Tina L Sing1,2, Minnie P Hung1,2, Shinsuke Ohnuki3
1Department of Biochemistry, University of Toronto, Toronto, Ontario, Canada.
The Journal of Cell Biology
|June 8, 2018
Summary
The Saccharomyces cerevisiae "remodels the structure of chromatin" (RSC) complex is crucial for maintaining cell ploidy. Deleting RSC genes causes cells to rapidly transition from haploid to diploid, impacting chromosome segregation.
Area of Science:
- Cell Biology
- Genetics
- Molecular Biology
Background:
- Cellular ploidy, the number of complete chromosome sets, is tightly regulated in eukaryotes.
- Accurate DNA replication and chromosome segregation are essential for maintaining genomic stability and cell viability.
- The 'remodels the structure of chromatin' (RSC) complex is a key regulator of chromatin structure and gene expression.
Purpose of the Study:
- To investigate the role of the Saccharomyces cerevisiae RSC complex in ploidy maintenance.
- To elucidate the mechanism by which RSC influences chromosome number regulation.
Main Methods:
- Genetic deletion analysis of nonessential RSC genes in Saccharomyces cerevisiae.
- Flow cytometry to assess DNA content and ploidy transitions.
- Microscopy to observe cell morphology and spindle pole body (SPB) duplication.
- Analysis of SPB insertion factors Nbp1 and Ndc1 localization.
Main Results:
- Deletion of six nonessential RSC genes resulted in a rapid transition from haploid to diploid DNA content.
- This diploidization occurred due to chromosome nondisjunction events.
- RSC facilitates chromosome segregation by promoting spindle pole body (SPB) duplication, specifically aiding the distribution of Nbp1 and Ndc1 to the new SPB.
Conclusions:
- The RSC complex plays an unexpected but critical role in ploidy maintenance in Saccharomyces cerevisiae.
- RSC is essential for proper SPB duplication, a process vital for accurate chromosome segregation.
- This study reveals a novel function for a SWI/SNF family complex in regulating cell ploidy through SPB duplication.
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