Genetics, Vol 119, 75-83, Copyright © 1988


INVESTIGATIONS

P Element Insertions and Rearrangements at the singed Locus of Drosophila melanogaster

H. Roiha, G. M. Rubin and K. O'Hare
Department of Biochemistry, University of California, Berkeley, California 94720 Present address: Department of Biochemistry and Biophysics, University of California, San Francisco, California 94143.

DNA from the singed gene of Drosophila melanogaster was isolated using an inversion between a previously cloned P element at cytological location 17C and the hypermutable allele singed-weak. Five out of nine singed mutants examined have alterations in their DNA maps in this region. The singed locus is a hotspot for mutation during P-M hybrid dysgenesis, and we have analyzed 22 mutations induced by P-M hybrid dysgenesis. All 22 have a P element inserted within a 700-bp region. The precise positions of 10 P element insertions were determined and they define 4 sites within a 100-bp interval. During P-M hybrid dysgenesis, the singed-weak allele is destabilized, producing two classes of phenotypically altered derivatives at high frequency. In singed-weak, two defective P elements are present in a ``head-to-head'' or inverse tandem arrangement. Excision of one element results in a more extreme singed bristle phenotype while excision of the other leads to a wild-type bristle phenotype.


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