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New ara-C resistant mutants of the Chinese hamster ovary cells

Published online by Cambridge University Press:  14 April 2009

N. C. Mishra ,
Kathryn Hinnant  and
Emily Cason
N. C. Mishra
Affiliation:
Department of Biology, University of South Carolina, Columbia, South Carolina 29208, U.S.A.
Kathryn Hinnant
Affiliation:
Department of Biology, University of South Carolina, Columbia, South Carolina 29208, U.S.A.
Emily Cason
Affiliation:
Department of Biology, University of South Carolina, Columbia, South Carolina 29208, U.S.A.

Summary

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Mutants of Chinese hamster ovary (CHO) cell resistant to cytosine arabinoside (ara-C), an inhibitor of DNA synthesis and antitumour drug, have been isolated and characterized both biochemically and genetically. Mutants occurring spontaneously and those induced by treatment with N-methyl-N′-Nitro-N-nitrosoguanidine (MNG), were obtained at a frequency of 0·24 × 10−6 and 3·4 10−6 respectively. The mutants showed a stable ara-C resistant phenotype which was inherited as a dominant trait in genetic crosses. The wild type (CHO K-1) and the mutant (103, 002 and 003) cells showed no differences in the levels of the uptake of ara-C or of its degradation. Results of biochemical studies further excluded the involvement of deaminase, kinase and ribonucleotide reductase as the possible factor(s) in conferring drug resistance to the mutant cells. However, the wild type and mutant DNA polymerases differed in the level of the in vitro incorporation of specific dNMP in the presence of ara-CTP. These data suggested that the wild-type DNA polymerase which becomes error prone in the presence of ara-CTP may cause the drug sensitivity of the wild-type cells and that a change in the mutant enzyme making it resistant (or less prone) to ara-CTP induced errors in dNMP incorporation may control the drug resistance of the mutant cells.

Type
Research Article
Information
Genetics Research , Volume 45 , Issue 3 , June 1985 , pp. 265 - 277
Copyright
Copyright © Cambridge University Press 1985

References

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