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A circadian clock mutant of Neurospora crassa, the most distinctive characteristic of which is the complete loss of temperature compensation of its period length, maps to the frq locus where seven other clock mutants have previously been mapped. This mutant, designated frq-9, is recessive to the wild-type allele and to each of the other frq mutants; thus, it differs from the other mutants, which show incomplete dominance to wild type and to each other. Complementation analysis suggests either that the frq locus is a single gene or that frq-9 is a deletion that overlaps adjacent genes. Preliminary efforts at fine structure mapping have indicated that recombination between certain pairs of frq mutations is less than 0.005%, a distance consistent with the locus being a single gene. The recessive nature of frq-9, coupled with complete loss of temperature compensation, suggests that this mutant may represent the null phenotype of the locus and that the frq gene is involved in the temperature compensation mechanism of the clock.—Genetic mapping studies have placed the frq locus on linkage group VIIR, midway between oli (oligomycin resistance) and for (formate auxotrophy), about 2 map units from each, and clearly indicate that frq and oli are separate genes.

A RECESSIVE CIRCADIAN CLOCK MUTATION AT THE frq LOCUS OF NEUROSPORA CRASSA