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Genetics, Vol 127, 747-759, Copyright © 1991
INVESTIGATIONS |
Three Neighboring Genes Interact With the Broad-Complex and the Stubble-stubbloid Locus to Affect Imaginal Disc Morphogenesis in Drosophila
P. J. Gotwals and J. W. Fristrom
Department of Molecular and Cellular Biology, Division of Genetics, University of California, Berkeley, California 94720
The Broad-Complex (BR-C) is a complex regulatory locus at 2B-5 on the X chromosome of Drosophila melanogaster. The wild-type BR-C products are apparent transcription factors necessary for imaginal disc morphogenesis. Alleles of the Stubble-stubbloid (Sb-sbd) locus at 89B9-10 act as dominant enhancers of broad alleles of the BR-C. Sb-sbd wild-type products are necessary for appendage elongation. We report, here, on three new loci implicated in imaginal disc morphogenesis based on their genetic interactions with both BR-C and/or Sb-sbd mutants. Enhancer of broad (E(br)) was identified as a dominant enhancer of the br(1) allele of the BR-C and is a recessive lethal. Mapping of E(br) has led to the identification of two loci, blistered and l(2)B485, mutants of which interact with E(br) and the Sb-sbd locus. Blistered, but not l(2)B485, interacts strongly with the BR-C. Alleles of the blistered locus are viable and disrupt proper wing disc morphogenesis independent of genetic interactions. All three loci map within the 0.6-map unit interval between the genetic markers speck and Irregular facets and to the cytological region 60C5-6; 60E9-10 at the tip of chromosome 2R. Genetic evidence is consistent with the view that the BR-C regulates blistered.
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