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Oxidative mutagens induce intrachromosomal recombination in yeast
R J Brennan1, B E Swoboda, R H Schiestl
1Department of Chemistry, University of Warwick, Coventry, UK.
Mutation Research
|July 16, 1994
Summary
Oxidative mutagens increase DNA recombination in yeast. Intrachromosomal recombination is a sensitive indicator for detecting mutagens and potential carcinogens.
Area of Science:
- Molecular Biology
- Genetics
- Toxicology
Background:
- Active oxygen species are implicated in disease development, including cancers.
- Understanding the genotoxic effects of oxidative mutagens is crucial for risk assessment.
Purpose of the Study:
- To investigate the impact of five oxidative mutagens on recombination frequencies in Saccharomyces cerevisiae.
- To evaluate the utility of intrachromosomal recombination assays for mutagen detection.
Main Methods:
- Exposure of yeast to methyl viologen, mitomycin C, phenylhydrazine, cumene hydroperoxide, and hydrogen peroxide.
- Quantification of intrachromosomal and interchromosomal recombination events.
- Assessment of hydroxyl radical scavenging by dimethyl sulfoxide (DMSO).
Main Results:
- All tested chemicals significantly elevated intrachromosomal recombination in a dose-dependent manner.
- Hydrogen peroxide uniquely increased interchromosomal recombination.
- DMSO significantly inhibited H2O2-induced recombination, suggesting a role for hydroxyl radicals.
Conclusions:
- Intrachromosomal recombination assays are effective short-term tests for identifying mutagens.
- Oxidative stress induced by specific chemicals can lead to increased DNA recombination.