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Two Mutators and Their Suppressors in DROSOPHILA ANANASSAE
1Department of Biology, The College of Wooster, Wooster, Ohio 44691.
Genetics
|August 1, 1979
Summary
Genetic studies reveal complex controls over mutation rates in fruit flies. Multiple suppressors, inherited maternally or autosomally, regulate mutator genes, minimizing spontaneous mutations.
Area of Science:
- Genetics and Molecular Biology
- Evolutionary Biology
Background:
- Spontaneous mutation rates vary significantly across different genetic stocks.
- Understanding the genetic mechanisms controlling mutation frequency is crucial for evolutionary studies.
Purpose of the Study:
- To investigate the genetic basis for differences in spontaneous mutation frequencies among fruit fly stocks.
- To identify and characterize the suppressors and mutators influencing mutation rates.
Main Methods:
- Comparative genetic analysis of seven mutant fruit fly stocks with varying Minute mutation frequencies.
- Detailed genetic mapping and analysis of dominant suppressors and mutator elements.
Main Results:
- Identified two complementary, autosomal, maternally expressed dominant suppressors of a 3-linked mutator.
- Discovered an additional maternally expressed, extrachromosomally transmitted suppressor of a paternal mutator.
- Demonstrated that maternal suppressors modify mutator-induced lesions post-fertilization.
Conclusions:
- Fruit flies possess diverse, multi-layered genetic controls over mutability.
- These findings support the hypothesis that natural selection employs various mechanisms to maintain low mutation rates while preserving mutational potential.
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