Selection and persistence of non-nucleoside reverse transcriptase inhibitor-resistant HIV-1 in patients starting and stopping non-nucleoside therapy

AIDS
Sarah PalmerJ M Coffin

Abstract

Understanding the selection and decay of drug-resistant HIV-1 variants is important for designing optimal antiretroviral therapy. To develop a high-throughput, real-time reverse transcriptase (RT) polymerase chain reaction (PCR) assay to quantify non-nucleoside reverse transcriptase inhibitor (NNRTI)-resistant variants K103N (AAT or AAC alleles) at frequencies as low as 0.1%, and to apply this to monitor these variants before, during, and after NNRTI therapy. HIV-1 RNA in longitudinal plasma samples obtained from patients starting and stopping NNRTI therapy was converted to cDNA and the target sequence region amplified and quantified by real-time PCR. Approximately 10 copies/reaction provided a template for a second round of PCR using primers that discriminated between the mutant and wild-type alleles. Amplification specificity was confirmed by thermal denaturation analysis. Frequencies of 103N similar to assay background (0.029%) were observed in longitudinal samples from 9 of 12 treatment-naive patients; three patients had transient increases in 103N frequency to a range of 0.21-0.48%, which was 7-16.5 times assay background. Analysis of longitudinal plasma samples from six NNRTI-experienced patients showed three patterns: pe...Continue Reading

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