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Genetics, Vol 133, 955-965, Copyright © 1993
INVESTIGATIONS |
A Genetic Analysis of the stoned Locus and Its Interaction With dunce, shibire and Suppressor of stoned Variants of Drosophila melanogaster
T. Z. Petrovich, J. Merakovsky and L. E. Kelly
Department of Genetics, University of Melbourne, Parkville, Victoria 3052, Australia
The genetic complementation patterns of both behavioral and lethal alleles at the stoned locus have been characterized. Mosaic analysis of a stoned lethal allele suggests that stoned functions either in the nervous system or in both the nervous system and musculature, but is not required for gross neural development. The behavioral alleles stn(ts) and stn(C), appear to be defective in a diametrically opposite sense, show interallelic complementation, and indicate distinct roles for the stoned gene product in the visual system and in motor coordination. A number of other neurological mutations have been investigated for their possible interaction with the viable stoned alleles. Mutations at two loci, dunce and shibire, act synergistically with the stn(ts) mutations to cause lethality, but fail to interact with stn(C). A third variant (Suppressor of stoned) has been identified which can suppress the debilitation associated with the stn(ts) mutations. These data, together with a previously identified interaction between the stn(ts) and tan mutants, indicate a central role for the stoned gene product in neuronal function, and suggests that the stoned gene product interacts, either directly or indirectly, with the neural cAMP second messenger system, with the synaptic membrane recycling pathway via dynamin, and with biogenic amine metabolism.
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