Methods for studying mutagenesis and checkpoints in Schizosaccharomyces pombe

Area of Science:

• Cellular Biology
• Genetics
• Molecular Biology

Background:

• Genomic instability, often caused by mutations in genome caretaker genes, is an early event in tumorigenesis.
• Cellular checkpoint mechanisms coordinate cell cycle progression with DNA repair and other responses to genomic insults.
• Fission yeast (Schizosaccharomyces pombe) is a model organism for studying checkpoint signaling pathways.

Purpose of the Study:

• To describe methods for analyzing mutagenesis and recombinational repair induced by genomic perturbations in fission yeast.
• To present methods for detecting checkpoint responses to replication stress and DNA damage in fission yeast.
• To elucidate how checkpoint activation influences mutagenic synthesis and DNA repair pathways.

Main Methods:

• Analysis of mutation rate and spectra following replication perturbation (genotoxic agents or caretaker gene mutations).
• Assessment of recombinational repair in response to replication stress.
• Detection of checkpoint activation in response to chromosome replication stress and DNA damage.

Main Results:

• Methods are presented to quantify mutation rates and spectra, and to assess recombinational repair.
• Techniques are described to examine checkpoint activation under replication stress and DNA damage conditions.
• The interplay between checkpoint activation, mutagenic synthesis via translesion DNA polymerase, and regulation of DNA repair is discussed.

Conclusions:

• The described methods enable comprehensive analysis of genomic instability and checkpoint responses in fission yeast.
• Understanding these mechanisms is vital for comprehending early tumorigenesis and developing therapeutic strategies.
• Checkpoint activation plays a critical role in regulating mutagenic processes and maintaining genomic integrity.