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EFFECTS OF THE RAD52 GENE ON RECOMBINATION IN SACCHAROMYCES CEREVISIAE
Satya Prakash 1, Louise Prakash 2, William Burke 2, and Beth A. Montelone 1
1 Department of Biology, University of Rochester, Rochester, New York 14627
2 Department of Radiation Biology and Biophysics, University of Rochester, School of Medicine & Dentistry, Rochester, New York 14642
Effects of the rad52 mutation in Saccharomyces cerevisiae on meiotic, 
-ray-induced, UV-induced and spontaneous mitotic recombination were studied. The rad52/rad52 diploids undergo premeiotic DNA synthesis; sporulation occurs but inviable spores are produced. Both intra and intergenic recombination during meiosis were examined in cells transferred from sporulation medium to vegetative medium at different time intervals. No intragenic recombination was observed at the his1–1/his1–315 and trp5–2/trp5–48 heteroalleles. Gene-centromere recombination also was not observed in rad52/rad52 diploids. No -ray- or UV-induced intragenic mitotic recombination is seen in rad52/rad52 diploids. The rate of spontaneous mitotic recombination is lowered five-fold at the his1–1/his1–315 and leu1–c/leu1–12 heteroalleles. Spontaneous reversion rates of both his1–1 and his1–315 were elevated 10 to 20 fold in rad52/rad52 diploids.—The RAD52 gene function is required for spontaneous mitotic recombination, UV- and -ray-induced mitotic recombination and meiotic recombination.
Revised on July 20, 1979
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