Low Frequency Nonnucleoside Reverse-Transcriptase Inhibitor—Resistant Variants Contribute to Failure of Efavirenz-Containing Regimens in Treatment-Experienced Patients

• Published in: The Journal of infectious diseases Vol. 201; no. 5; pp. 672 - 680
• Main Authors: Halvas, Elias K., Wiegand, Ann, Boltz, Valerie F., Kearney, Mary, Nissley, Dwight, Wantman, Michael, Hammer, Scott M., Palmer, Sarah, Vaida, Florin, Coffin, John M., Mellors, John W.
• Format: Journal Article
• Language: English
• Published: Oxford The University of Chicago Press 01.03.2010; University of Chicago Press; Oxford University Press
• Subjects: Alkynes; Anti-HIV Agents - therapeutic use; Antiretroviral Therapy, Highly Active - methods; Antiretrovirals; Benzoxazines - therapeutic use; Biological and medical sciences; Cyclopropanes; Drug Resistance, Viral; Fundamental and applied biological sciences. Psychology; Genetic mutation; Genetic Variation; Genotypes; HIV 1; HIV Infections - drug therapy; HIV Infections - virology; HIV Reverse Transcriptase - genetics; HIV-1 - classification; HIV-1 - drug effects; HIV-1 - genetics; HIV/AIDS; Human immunodeficiency virus 1; Humans; Infectious diseases; Low frequencies; Medical sciences; Medicin och hälsovetenskap; Microbiology; Mutation, Missense; Plasma - virology; Polymerase chain reaction; Polymerase Chain Reaction - methods; RNA; Selection, Genetic; Sequence Analysis, DNA; Sequencing; Treatment Failure; Virology; Viruses; Human; Antiretroviral agent; Benzoxazine derivatives; RNA-directed DNA polymerase; Acetylenic compound; Enzyme; Non nucleoside compound; Transferases; Enzyme inhibitor; Efavirenz; Infection; Resistance; Allosteric inhibitor; Nucleotidyltransferases; Treatment; Reverse transcriptase inhibitor; Antiviral; Failure
• ISSN: 0022-1899; 1537-6613; 1537-6613; 1573-6613
• DOI: 10.1086/650542

Background. The contribution of low frequency drug-resistant human immunodeficiency virus type 1 (HIV-1) variants to failure of antiretroviral therapy is not well defined in treatment-experienced patients. We sought to detect minor nonnucleoside reverse-transcriptase inhibitor (NNRTI)-resistant variants at the initiation of multidrug efavirenz-containing therapy in both NNRTI-naive and NNRTI-experienced patients and to determine their association with virologic response. Methods. Plasma samples at entry and at time of virologic failure from patients enrolled in the AIDS Clinical Trials Group study 398 were analyzed by standard genotype, single-genome sequencing and allele-specific polymerase chain reaction (K103N and Y181C) to detect and quantify minor NNRTI-resistant variants. Results. Minor populations of NNRTI-resistant variants that were missed by standard genotype were detected more often at study entry in NNRTI-experienced patients than NNRTI-naive patients by both single-genome sequencing (8 of 12 vs 3 of 15; P = .022) and allele-specific polymerase chain reaction (>1% Y181C, 5 of 22 vs 3 of 72, respectively; P = 0.16). K103N variants at frequencies >1% were associated with inferior HIV-1 RNA response to efavirenz-containing therapy between entry and week 24 (change in HIV-1 RNA level, +0.5 vs −1.1 log10 copies/mL; P < .001). Conclusions. Minor NNRTI-resistant variants were more prevalent in NNRTI-experienced patients and were associated with reduced virologic response to efavirenz-containing multidrug regimens.