Exposure of cdc8 homozygous diploids of Saccharomyces cerevisiae to nonpermissive temperature leads to an increase in mitotic conversion frequencies

Summary In a diploid strain homozygous for the cdc8-1 mutation, a block in DNA synthesis caused by restrictive temperature resulted in a significant increase in the frequency of intragenic recombination at the HOM2 locus. Under restrictive conditions, incorporation of radioactivity into DNA was reduced to 2% of the control and alkaline sucrose gradient centrifugation revealed that only short DNA fragments were synthesized. There was no considerable fragmentation of template DNA during incubation of cdc8-1 strains under restrictive conditions.