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Genetics, Vol 122, 139-151, Copyright © 1989
INVESTIGATIONS |
Co-Localization to Chromosome Bands 99E1-3 of the Drosophila melanogaster Myosin Light Chain-2 Gene and a Haplo-Insufficient Locus That Affects Flight Behavior
J. W. Warmke, A. J. Kreuz and S. Falkenthal
Department of Molecular Genetics, The Ohio State University, Columbus, Ohio 43210
Using overlapping synthetic deficiencies, we find that a haplo-insufficient locus affecting flight behavior and the myosin light chain-2 gene co-map to the Drosophila melanogaster polytene chromosome interval 99D9-E1 to 99E2-3. From screening over 9000 EMS-treated chromosomes, we obtained alleles of two complementation groups that map to this same interval. One of these complementation groups, Ifm(3)99Eb, exhibits dominant flightless behavior; thus, flightless behavior of the deficiency is in all likelihood due to hemizygosity of this single locus. Rescue of flightless behavior by a duplication indicates that the single allele, E38, of the Ifm(3)99Eb complementation group is a hypomorph. Based upon its map position and a reduction in concentration of myosin light chain-2 mRNA in heterozygotes, we propose that Ifm(3)99Eb(E38) is a mutant allele of the myosin light chain-2 gene. Our genetic analysis also resulted in the identification of four dominant flightless alleles of an unlinked locus, l(3)nc99Eb, that exhibits dominant lethal synergism with Ifm(3)99Eb.
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