MOLECULAR GENETICS OF THE ROSY-ACE REGION OF DROSOPHILA MELANOGASTER

Janos Gausz ¹, Lucinda M. C. Hall ², Anne Spierer ², and Pierre Spierer ²

¹ Department of Molecular Biology, University of Geneva, 30 quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland; Department of Animal Biology, University of Geneva, 154 rue de Malagnou, CH-1224 Geneva, Switzerland; and Institute of Genetics, Hungarian Academy of Sciences, P.O. Box 521, Szeged, Hungary
² Department of Molecular Biology, University of Geneva, 30 quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland

Three hundred and fifteen kilobases of DNA from the rosy-Ace region on chromosome 3R of D. melanogaster have previously been cloned and extensively characterized. We describe the isolation of nine new deficiency mutants that break within the 315-kb interval. The position of these breakpoints on the DNA map was determined by in situ and Southern hybridization. Further, we more precisely mapped the breakpoints of several deletions previously analyzed. The results permit us to delimit sequences essential to the known complementation groups in the region within approximately 20 kb in most cases. However, one gene, B16-1, is shown to contain essential sequences that span about 50 kb. Also, we demonstrate by overlapping deficiencies that a 45-kb DNA segment from the region, which includes one known complementation group, allows limited survival when deleted.

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