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. 1984 Jun;50(3):838–846. doi: 10.1128/jvi.50.3.838-846.1984

Cooperative effects between two acyclovir resistance loci in herpes simplex virus.

G Darby, M J Churcher, B A Larder
PMCID: PMC255744  PMID: 6328014

Abstract

The acyclovir-resistant mutant SC16 R9C2 (H.J. Field, G. Darby, and P. Wildy , J. Gen. Virol. 49:115-124, 1980) has been shown to contain two resistance loci which segregate independently on recombination with wild-type virus. One locus is in thymidine kinase, and the other is in DNA polymerase. Both induced enzymes have altered properties, thymidine kinase showing a low affinity for acyclovir and low activity, and DNA polymerase showing a low affinity for acyclovir triphosphate. Other properties of both enzymes are described which distinguish them from their wild-type counterparts. Recombinants containing either mutant thymidine kinase ( RSC -11) or mutant DNA polymerase ( RSC -26), but not both, have been used to investigate the relative contribution of each lesion to resistance and pathogenicity. Although SC16 R9C2 and both recombinants grow as well as does wild-type virus in tissue culture, they are considerably attenuated in vivo, the greatest attenuation of virulence being seen with SC16 R9C2 and RSC -26. With respect to both acyclovir resistance and in vivo growth, the lesions appear to behave synergistically. Cross resistance studies have shown the recombinant RSC -26, which contains mutant DNA polymerase but which evidently expresses wild-type thymidine kinase, to be cross resistant to both 5-iodo-2'-deoxyuridine and 5-trifluoromethyl-2'-deoxyuridine but not to (E)-5-(2-bromovinyl)-2'-deoxyuridine or 9-beta-D-arabinofuranosyladenine.

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Selected References

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