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Single-stranded DNA arising at telomeres in cdc13 mutants may constitute a specific signal for the RAD9 checkpoint
B Garvik1, M Carson, L Hartwell
1Department of Genetics, University of Washington, Seattle 98195, USA.
Molecular and Cellular Biology
|November 1, 1995
Summary
The CDC13 gene product is crucial for telomere maintenance in Saccharomyces cerevisiae. Its dysfunction causes DNA damage, activating the RAD9 checkpoint and leading to telomere sequence loss.
Area of Science:
- * Molecular and Cellular Biology
- * Genetics and Genomics
- * Yeast as a Model Organism
Background:
- * The Saccharomyces cerevisiae cell cycle is regulated by checkpoints that respond to DNA damage.
- * The RAD9 checkpoint is activated by DNA damage, leading to cell cycle arrest.
- * Telomeres are protective caps at the ends of chromosomes that are essential for genome stability.
Purpose of the Study:
- * To investigate the function of the CDC13 gene product in Saccharomyces cerevisiae.
- * To elucidate the role of CDC13 in telomere metabolism and cell cycle regulation.
- * To determine the relationship between CDC13, DNA damage, and the RAD9 checkpoint.
Main Methods:
- * Utilized a temperature-sensitive mutant of CDC13 in Saccharomyces cerevisiae.
- * Analyzed cell cycle progression and DNA damage at restrictive temperatures.
- * Examined DNA lesions, mitotic recombination, and telomere-associated sequences.
Main Results:
- * cdc13 mutants arrest in G2 phase due to DNA damage activating the RAD9 checkpoint.
- * DNA lesions are primarily located in telomere-proximal regions.
- * cdc13 rad9 double mutants exhibit single-stranded DNA at telomeres and eventually lose telomere sequences.
Conclusions:
- * The CDC13 product is essential for telomere metabolism, likely in replication or protection.
- * Dysfunctional CDC13 leads to telomere damage and activation of the RAD9 DNA damage checkpoint.
- * Single-stranded DNA at telomeres may serve as a specific signal for the RAD9 checkpoint.