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INDIRECT SUPPRESSION IN CAENORHABDITIS ELEGANS
Donald L. Riddle 1 and S. Brenner 1
1 Medical Research Council Laboratory of Molecular Biology,
Hills Road, Cambridge CB2 2HQ, England
Two cases of indirect suppression have been characterized. One case involves suppressors compensating for defects in muscle structure. Nine independent suppressor mutations were judged to lie in a single suppressor gene, sup-3. Suppression is dominant, but dose dependent, and results in improved locomotion, as well as in an increase in the ability of mutant animals to lay eggs. Mutations in six genes known to affect muscle structure were tested for suppression by representative sup-3 mutations. Alleles of three of the six genes are suppressed, two of which are known to code for thick filament proteins. One suppressor allele was identified as a deletion by genetic criteria. A second case of indirect suppression is not associated with muscle defects, but involves two mutant genes producing uncoordinated phenotypes very similar to one another. As in the first case, suppression is dominant but dose dependent and is not allele specific.
Submitted on December 16, 1977Revised on February 6, 1978
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