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Locus-dependent profiles of the rescue of nonexcitable behavioral mutants during conjugation in Tetrahymena thermophila.

The Tetrahymena nonreversal (TNR) mutants of Tetrahymena thermophila are behavioral mutants with nonexcitable membranes. When cells of the tnrB mutant were mated with wild type, a phenotypic change occurred about 1 h after pair formation. The pairs began to lose their heterotypic character in stimulation solution containing high potassium and, within 1 1/2 h, they were not distinguishable from the wild-type homotypic pairs. On the contrary, although pairs of the tnrA and wild type also lost their heterotypic character about 1 1/2 h after pair formation, they never showed a full response as wild-type homotypic pairs. When tnrA was mated with tnrB, more than 50% of pairs expressed a heterotypic pair character 2 h after pair formation, consistent with the tnrB defect having been rescued but not the tnrA defect. Thus, conjugation rescue of the mutant phenotype is locus dependent and probably reflects the nature of the gene products controlling voltage-dependent Ca2+ channels.