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Reverse transcriptase genotype and antiretroviral susceptibility of human immunodeficiency virus isolates from patients with advanced disease treated with didanosine: Correlation with virologic response and survival
Author(s) -
Shepp David H.,
Ashraf Amar,
Tang Ian T.L.,
Match Mark E.,
Millan Colleen,
Pergolizzi Robert
Publication year - 1996
Publication title -
journal of medical virology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 121
eISSN - 1096-9071
pISSN - 0146-6615
DOI - 10.1002/(sici)1096-9071(199608)49:4<303::aid-jmv8>3.0.co;2-7
Subject(s) - didanosine , zidovudine , virology , genotype , reverse transcriptase , biology , drug resistance , lentivirus , virus , viral disease , immunology , polymerase chain reaction , genetics , gene
To identify correlates of virologic response and survival, the reverse transcriptase (RT) genotype and in vitro antiviral susceptibility of human immunodeficiency virus (HIV) isolates from 20 patients treated with didanosine were studied. Patients had advanced HIV disease and were intolerant to or had failed zidovudine. Neither RT genotype nor antiviral susceptibility testing, as determined by a peripheral blood mononuclear cell‐based assay, correlated with a virologic response to didanosine, as determined previously by quantitative serum culture. Only one (8%) of 12 isolates obtained after 6–12 months of treatment showed mutation at codon 74 conferring didanosine resistance. Reversions were seen in three of five patients with pre‐treatment zidovudine resistance mutations at codons 70, but in none of eight with mutations at codon 215. Pre‐treatment isolates encoding mutations at RT codon 215 or encoding codon 123 asp were associated with both significantly greater CD4 lymphocyte depletion and shorter survival. In this cohort of patients with advanced HIV disease, neither rapid emergence of didanosine resistance nor rapid reversion of zidovudine resistance was observed. To better understand the relationship between virologic response and in vitro susceptibility to didanosine, more precise tools may be needed. © 1996 Wiley‐Liss, Inc.