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07 February 2017 : Clinical Research  

Prevalence of Transmitted Drug-Resistance Mutations and Polymorphisms in HIV-1 Reverse Transcriptase, Protease, and gp41 Sequences Among Recent Seroconverters in Southern Poland

Joanna Smoleń-Dzirba1ACDEFG, Magdalena Rosińska2CDG, Piotr Kruszyński1C, Jolanta Bratosiewicz-Wąsik3C, Robert Wojtyczka1F, Janusz Janiec2B, Bartosz Szetela4B, Marek Beniowski5B, Monika Bociąga-Jasik6B, Elżbieta Jabłonowska7B, Tomasz J. Wąsik1DF*, and The CASCADE Collaboration in EuroCoord8

DOI: 10.12659/MSM.898656

Med Sci Monit 2017; 23:682-694

Abstract

BACKGROUND: Monitoring of drug resistance-related mutations among patients with recent HIV-1 infection offers an opportunity to describe current patterns of transmitted drug resistance (TDR) mutations.

MATERIAL AND METHODS: Of 298 individuals newly diagnosed from March 2008 to February 2014 in southern Poland, 47 were deemed to have recent HIV-1 infection by the limiting antigen avidity immunoassay. Proviral DNA was amplified and sequenced in the reverse transcriptase, protease, and gp41 coding regions. Mutations were interpreted according to the Stanford Database algorithm and/or the International Antiviral Society USA guidelines. TDR mutations were defined according to the WHO surveillance list.

RESULTS: Among 47 patients with recent HIV-1 infection only 1 (2%) had evidence of TDR mutation. No major resistance mutations were found, but the frequency of strains with ≥1 accessory resistance-associated mutations was high, at 98%. Accessory mutations were present in 11% of reverse transcriptase, 96% of protease, and 27% of gp41 sequences. Mean number of accessory resistance mutations in the reverse transcriptase and protease sequences was higher in viruses with no compensatory mutations in the gp41 HR2 domain than in strains with such mutations (p=0.031).

CONCLUSIONS: Despite the low prevalence of strains with TDR mutations, the frequency of accessory mutations was considerable, which may reflect the history of drug pressure among transmitters or natural viral genetic diversity, and may be relevant for future clinical outcomes. The accumulation of the accessory resistance mutations within the pol gene may restrict the occurrence of compensatory mutations related to enfuvirtide resistance or vice versa.

Keywords: Drug Resistance, HIV Fusion Inhibitors, HIV-1, Protease Inhibitors, Reverse Transcriptase Inhibitors

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750