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Decreased UV mutagenesis in cdc8, a DNA replication mutant of Saccharomyces cerevisiae

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Summary

A DNA replication mutant of yeast, cdc8, was found to decrease UV-induced reversion of lys2-1, arg4-17, tyr1 and ura1. This effect was observed with all three alleles of cdc8 tested. Survival curves obtained following UV irradiation in cdc8 rad double mutants show that cdc8 is epistatic to rad6, as well as to rad1; cdc8 rad51 double mutants seem to be more sensitive than the single mutants. Since UV-induced reversion in cdc8 rad1 and cdc8 rad51 double mutants is like that of the cdc8 single mutants, we conclude that CDC8 plays a direct role in error-prone repair. To test whether CDC8 codes for a DNA polymerase, we have purified both DNA polymerase I and DNA polymerase II from cdc8 and CDC+ cells. The purified DNA polymerases from cdc8 were no more heat labile than those from CDC+, suggesting that CDC8 is not a structural gene for either enzyme.

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Authors and Affiliations

  1. Department of Radiation Biology and Biophysics, University of Rochester, School of Medicine and Dentistry, 14642, Rochester, New York

    Louise Prakash

  2. Department of Biology, Univesity of Rochester, 14627, Rochester, New York, USA

    David Hinkle & Satya Prakash

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  1. Louise Prakash
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  2. David Hinkle
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  3. Satya Prakash
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Communicated by B.A. Bridges

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Prakash, L., Hinkle, D. & Prakash, S. Decreased UV mutagenesis in cdc8, a DNA replication mutant of Saccharomyces cerevisiae . Molec. Gen. Genet. 172, 249–258 (1979). https://doi.org/10.1007/BF00271724

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  • DOI: https://doi.org/10.1007/BF00271724

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