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Genetics, Vol 140, 629-641, Copyright © 1995
INVESTIGATIONS |
A Genetic Analysis of the Drosophila Closely Linked Interacting Genes bulge, argos and soba
T. Wemmer and C. Klambt
Institut fur Entwicklungsbiologie, Universitat zu Koln, D-50923 Koln, Germany
The Drosophila gene argos encodes a diffusible protein that acts as a negative regulator of cell fate decisions. To define interacting gene products, we performed a genetic analysis of argos, which suggests the presence of several partially redundant gene functions in its immediate vicinity at the chromosomal position 73A. Dose titration experiments have identified two of these loci. One of them corresponds to the gene bulge. Loss of function bulge alleles suppress the rough eye phenotype associated with overexpression of argos; conversely, amorphic argos mutations suppress the eye phenotype seen in flies bearing a single dominant bulge allele. Recombination mapping localized bulge 0.15 cM distal to argos. A second gene, suppressor of bulge and argos (soba), corresponds to the recently described lethal complementation group 73Aj. soba alleles suppress the eye phenotypes seen in flies expressing either the dominant bulge allele or the hs-argos construct. soba resides 120 kb proximal to argos. In addition, we have identified one allele of a new gene, clown, which like soba suppresses the eye phenotypes associated with hs-argos and bulge(Dominant). clown maps on chromosome 3 at the cytological position 68CD.
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