EPISTATIC INTERACTIONS OF RADIATION-SENSITIVE (rad) MUTANTS OF CAENORHABDITIS ELEGANS

Philip S. Hartman ¹

¹ Department of Biology, Texas Christian University, Fort Worth, Texas 76129

Six double mutants and a quadruple mutant were derived from four UV radiation-hypersensitive single mutants (rad-1, rad-2, rad-3 and rad-7). Sensitivities of the 11 strains to UV, -radiation and methyl methanesulfonate (MMS) were compared. Of the six double mutants, only the rad-1;rad-2 and rad-3;rad-7 doubles were no more hypersensitive than the most sensitive single mutant to UV-radiation. Thus, rad-1 and rad-2 define one epistasis group, whereas rad-3 and rad-7 define another. Consistent with this model was the observation that rad-1 and rad-2, but not rad-3 and rad-7, were hypersensitive to -radiation. In addition, none of the multiple mutants was more hypersensitive to -radiation than the most sensitive single rad mutant. No synergistic interactions of the rad mutations with respect to MMS sensitivities were observed.

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