MALE PHENOTYPES AND MATING EFFICIENCY IN CAENORHABDITIS ELEGANS

Jonathan Hodgkin ¹

¹ Medical Research Council, Laboratory of Molecular Biology, Hills Road, Cambridge CB2 2QH England

Mating behavior in adult male nematodes can be assayed by mating efficiency, i.e., the number of cross progeny sired by males under standard conditions. Mutant males from 220 strains, representing most of the known complementation groups of C. elegans, have been examined for mating efficiency and for anatomical abnormalities of the specialized male copulatory organs. These data extend the phenotypic description of these mutants and indicate what anatomical and behavioral components are necessary for the ability to mate successfully. Also, mutants with specific defects in the male were sought by establishing superficially wild-type hermaphrodite stocks after mutagenesis and testing the males segregated by these stocks for mating efficiency. Forty-nine of 1119 stocks yielded abnormal males. Seventeen were characterized in detail and found to be abnormal in sensory behavior (carrying mutations in the genes che-2 or che-3) or male genital anatomy (carrying mutations in one of the genes mab-1 to mab-10). Four of the mab (male abnormal) genes affect specific postembryonic cell lineages.

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