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. 1984 Jun;4(6):1152–1158. doi: 10.1128/mcb.4.6.1152

DNA-mediated cotransfer of excision repair capacity and drug resistance into chinese hamster ovary mutant cell line UV-135.

M A MacInnes, J M Bingham, L H Thompson, G F Strniste
PMCID: PMC368884  PMID: 6738535

Abstract

We have investigated DNA-mediated transfer of aminopterin resistance conferred by plasmid and UV resistance conferred by genomic DNA to the Chinese hamster ovary (CHO) cell line UV-135, a UV-sensitive mutant defective in nucleotide excision repair. Plasmid pSV2gpt-CaPO4 coprecipitates induced aminopterin resistance with equal efficiency in the 6-thioguanine-resistant, aminopterin-sensitive, repair-proficient parental line AA8-4(tg-1) and in UV-135(tg-2). Genetic and molecular evidence for genomic DNA-mediated transformation of UV-135(tg-2) cells with a putative excision repair gene were obtained by demonstrating that: (i) UV resistance transformation is dependent upon and specific for genomic DNA from excision repair-competent CHO cells: (ii) UV and drug coresistant colonies are bona fide transferants as verified by hybridization and Southern blotting analysis of pSV2gpt sequences in their genomic DNAs: (iii) confirmed transferants exhibit partial to near normal UV resistances for colony formation: and (iv) UVr transferants have near normal levels of excision repair capacity. The overall frequency of drug and UV resistance cotransformation was 8 X 10(8) per cell plated. This frequency was ca. 200- to 500-fold greater than that expected from coincident but independent UVr reversion and plasmid gene transfer events. DNA transfer techniques with this CHO system will be useful for further analysis of the essential structural DNA sequences, gene cloning, and expression of functional excision repair genes.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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