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Characterization of the mutator mutation mut5-1.

D P Morrison, P J Hastings

Molecular & General Genetics : MGG

|August 1, 1979

Summary

The yeast mutator mutation mut5-1, identified as RAD51, impairs DNA repair and recombination. This study reveals its essential role in both mitotic and meiotic processes, impacting mutation rates and genetic stability.

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Area of Science:

Molecular biology
Genetics
Yeast genetics

Background:

DNA repair mechanisms are crucial for maintaining genomic integrity.
Mutator mutations can alter spontaneous mutation rates by affecting DNA repair pathways.
The RAD51 gene is known to be involved in DNA repair and recombination processes in yeast.

Purpose of the Study:

To characterize the mutator mutation mut5-1 in yeast.
To investigate the role of mut5-1 in DNA repair, recombination, and mutagenesis.
To determine the relationship between mut5-1 and other DNA repair genes, specifically RAD51.

Main Methods:

Characterization of the mut5-1 mutation using various parameters for DNA repair mutants.
UV-mutability assays at different doses.
Analysis of UV-induced recombination between specific alleles (his1-1 and hist1-315).
Complementation and genetic mapping studies.
Assessment of meiotic recombination, sporulation, and spore viability.

Main Results:

The mut5-1 mutation showed no significant effect on UV-mutability at lower doses.
Homozygous mut5-1 diploids exhibited deficiency in UV-induced recombination.
Complementation and mapping confirmed mut5-1 is allelic to rad51-1.
Both homozygous and heterozygous mut5-1 diploids produced segregants indicative of nondisjunction events.
RAD51 function was found to be essential at two points during meiosis.

Conclusions:

The mutator mutation mut5-1 is allelic to RAD51, suggesting a role in DNA repair.
RAD51 function is essential for both mitotic and meiotic recombination in yeast.
The RAD51 gene product plays a critical role in maintaining genetic stability by influencing DNA repair and recombination pathways.

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