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OM MUTATIONS IN DROSOPHILA ANANASSAE ARE LINKED TO INSERTIONS OF A TRANSPOSABLE ELEMENT
Antony E. Shrimpton 1, Elizabeth A. Montgomery 1, and Charles H. Langley 1
1 Laboratory of Genetics, National Institute of Environmental
Health Sciences, Research Triangle Park, North Carolina 27709
It has been hypothesized that Om mutability in Drosophila ananassae (involving spontaneous mutation at 20 loci, resulting in semidominant, nonpleiotropic eye morphology defects) was due to insertion of a transposable element, tom. One particularly unstable X-linked Om allele produced several derivatives, one of which has a more extreme Om phenotype and was accompanied by a singed bristle mutant, sn 9g. DNA probes from the sn locus of D. melanogaster were used to clone the homologous region of D. ananassae. Analysis of sn9g DNA detected a 6.5-kb insert. Genomic Southern blotting and in situ hybridization techniques showed that this insert is repetitive and dispersed. The existence of the tom element is supported by genetic mapping that established homology between the 6.5-kb sn9g insert and Om mutants at the four X-linked loci tested.
Submitted on March 29, 1985Accepted on May 12, 1986
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