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Genetics, Vol 143, 1321-1337, Copyright © 1996
INVESTIGATIONS |
Scalloped wings Is the Lucilia cuprina Notch Homologue and a Candidate for the Modifier of Fitness and Asymmetry of Diazinon Resistance
A. G. Davies, A. Y. Game, Z. Chen, T. J. Williams, S. Goodall, J. L. Yen, J. A. McKenzie and P. Batterham
Present address: Department of Genetics and Cell Biology, University of Minnesota, St. Paul, MN 55108.
The Scalloped wings (Scl) gene of the Australian sheep blowfly, Lucilia cuprina, is shown to be the homologue of the Drosophila melanogaster Notch gene by comparison at the DNA sequence and genetic levels. A L. cuprina genomic fragment, which shows strong identity with the Notch (N) gene at the molecular level, hybridizes to the location of the Scl gene on polytene chromosomes. The two genes are functionally homologous; the dominant and recessive Notch-like phenotypes produced by mutations in the Scl gene allow these alleles to be classed as N-like or Abruptex-like. The Scl gene is under investigation as a candidate for the fitness and asymmetry Modifier (M) of diazinon resistance. We show that M affects the penetrance of wing and bristle phenotypes associated with two Scl alleles in a manner consistent with the M being an allele of Scl. In addition, we report a phenotypic interaction between the diazinon-resistance mutation, Rop-1, and the same alleles of Scl. We propose that the product of Rop-1, an esterase, may be involved in cell adhesion in developmental processes involving the Scl gene product.
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