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Objectives: To investigate the prevalence of nonpolymorphic resistance-associated mutations (RAM) in HIV-1 patients on first-line antiretroviral therapy in Kuwait., Subjects and Methods: Total RNA was isolated from plasma samples of 42 patients who received a first-line nonnucleoside reverse transcriptase inhibitor (NNRTI)-based regimen. HIV-1 protease and reverse transcriptase genetic regions were then amplified by nested reverse transcription-polymerase chain reaction and directly sequenced. The HIV-1 subtype was identified using the Bayesian phylogenetic method, and RAM were identified using the Stanford University genotypic resistance interpretation algorithm., Results: The HIV-1 viral load at sampling ranged from < 20 to 8.25 × 104 copies/ml. CRF01&#95;AE, C, and B were the most predominant HIV-1 subtypes. Nonpolymorphic mutations associated with resistance to antiretroviral drugs were detected in 11 (26.2%) of the 42 patients; 5 (11.9%) patients had mutations associated with a high-level resistance to nucleoside reverse transcriptase inhibitors (NRTI), 4 (9.5%) patients had mutations associated with resistance to NNRTI, 1 (2.4%) patient had mutations associated with resistance to both NRTI and NNRTI, and 1 (2.4%) patient had mutations potentially associated with low-level resistance to both protease inhibitors and NNRTI. All patients with RAM had a detectable plasma HIV-1 RNA level., Conclusion: Our results indicate the development of RAM during an NNRTI-based regimen and highlight the importance of considering other regimens to avoid treatment failure., (© 2018 The Author(s) Published by S. Karger AG, Basel.)

Objectives: Resistance-associated mutations (RAMs) in the integrase of different HIV-1 subtypes were investigated in a cohort of patients never exposed to integrase strand transfer inhibitors (INSTIs)., Methods: The viral RNA was extracted from plasma samples of 53 INSTI-naïve patients, and the integrase genetic region was sequenced and analyzed for subtype assignment and drug resistance., Results: The median viral load at sampling was 5.28 × 104 RNA copies/mL. Bayesian phylogenetic analysis showed 85% of the HIV-1 isolates were non-B subtypes, with a predominance of subtypes C (22.6%) and CRF01&#95;AE (26.4%). A total of 52 and 110 mutations were found in the integrase region of HIV-1 B and non-B subtypes, respectively. Nonpolymorphic INSTI-RAMs were not detected in this study. However, the accessory mutation E157Q was found in 1 patient with CRF02&#95;AG, and the polymorphic mutations L74M/I that may contribute to a reduced susceptibility to INSTIs in the presence of major mutations were observed in 6 (13.3%) patients with non-B subtypes and 1 (12.5%) patient with the B subtype. Polymorphic mutations at positions known to harbor primary and accessory RAMs were also detected in this study., Conclusion: Our results highlight the importance of monitoring the emergence of INSTI-RAMS before and after the initiation of INSTI-based therapy., (© 2017 S. Karger AG, Basel.)