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. 1992 Dec;66(12):7128–7135. doi: 10.1128/jvi.66.12.7128-7135.1992

Novel mutation in the human immunodeficiency virus type 1 reverse transcriptase gene that encodes cross-resistance to 2',3'-dideoxyinosine and 2',3'-dideoxycytidine.

Z Gu 1, Q Gao 1, X Li 1, M A Parniak 1, M A Wainberg 1
PMCID: PMC240397  PMID: 1279198

Abstract

We have used the technique of in vitro selection to generate variants of human immunodeficiency virus type 1 (HIV-1) that are resistant to 2',3'-dideoxyinosine (ddI) and cross-resistant to 2',3'-dideoxycytidine (ddC). The complete reverse transcriptase (RT)-coding regions, plus portions of flanking sequences, of viruses possessing a ddI-resistant phenotype were cloned and sequenced by polymerase chain reaction (PCR)-based methods. We observed that several of these viruses possessed mutations at amino acid sites 184 (Met-->Val; ATG-->GTG) and 294 (Pro-->Ser; CCA-->TCA). These mutations were introduced in the pol gene of infectious, cloned HXB2-D DNA by site-directed mutagenesis. Viral replication assays confirmed the importance of site 184 with regard to resistance to ddI. The recombinant viruses thus generated displayed more than fivefold-greater resistance to ddI than parental HXB2-D did. Moreover, more than fivefold-greater resistance to ddC was also documented; however, the recombinant viruses continued to be inhibited by zidovudine (AZT). No resistance to ddI, ddC, or AZT was introduced by inclusion of mutation site 294 in the pol gene of HXB2-D. PCR analysis performed on viral samples obtained from patients receiving long-term ddI therapy confirmed the presence of mutation site 184 in five of seven cases tested. In three of these five positive cases, the wild-type codon was also detected, indicating that mixtures of viral quasispecies were apparently present. Viruses possessing a ddI resistance phenotype were isolated from both subjects whose viruses contained only the mutated rather than wild-type codon at position 184 as well as from a third individual, whose viruses appeared to be mostly of the mutated variety.

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Selected References

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