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Morphogenetically Specific Mutability in DROSOPHILA ANANASSAE
1Department of Biology, The College of Wooster, Wooster, Ohio 44691.
Female hypermutability produces optic morphology mutants (Om) via X chromosome homozygosity. Extrachromosomal elements stimulate Om mutant production in heterozygotes, suggesting a transposable element mechanism.
Area of Science:
- Genetics
- Developmental Biology
- Molecular Biology
Background:
- Hypermutable stocks provide insights into genetic instability and gene regulation.
- Optic morphology mutants (Om) are valuable for studying eye development and genetic pathways.
Purpose of the Study:
- To genetically analyze a stock exhibiting hypermutability for optic morphology mutants (Om).
- To elucidate the genetic basis and regulatory mechanisms underlying Om mutant production.
Main Methods:
- Genetic analysis of hypermutable stocks.
- Mapping of Om mutants to identify responsible loci.
- Investigation of the role of X chromosomes and extrachromosomal elements.
Main Results:
- Om mutant production is female-restricted and dependent on X chromosome homozygosity.
- Extrachromosomal elements stimulate Om mutability in heterozygotes.
- Om mutants map to at least 15 loci and are moderately unstable.
- Dominant suppressors arise spontaneously at two X-linked loci.
Conclusions:
- The findings suggest an X-linked transposable element (tom) involved in Om mutant generation.
- This transposable element likely inserts into control sequences of eye morphogenesis genes.
- The study reveals a novel mechanism of genetic instability impacting development.
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