Voprosy virusologii · 2025
[Analysis of genetic polymorphisms and drug resistance mutations in the NS5 region of HCV genome (Flasuviricetes: Amarillovirales: Flaviviridae: Hepacivirus C) in samples obtained in 2022-2023 from HIV-infected treatment-naive residents of Altai Krai].
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Lapovok I A, Syrkina A V, Kirichenko A A, Shlykova A V, Lukyanenko N V, Safyanova T V, Safronova A E, Shevchenko V V, Kireev D E
Аннотация
INTRODUCTION: Altai Krai is a region with an unfavorable situation of HIV-1 and HCV infection, as well as HIV-1 and HCV coinfection. Due to this, it is necessary to study the HCV genetic variants and their drug resistance (DR) to direct-acting antivirals (DAAs) in patients with HIV-1 and HCV coinfection.
AIM OF THE STUDY: The analysis of HCV genome fragments encoding NS5A and NS5B proteins in samples obtained from treatment-naïve residents of Altai Krai with newly diagnosed HIV and HCV co-infection to determine the genetic variant of HCV and genetic features of the virus associated with its sensitivity to NS5A and NS5B inhibitors.
MATERIALS AND METHODS: Blood plasma samples (n = 286) collected in 2022-2023 from HIV-infected individuals were analyzed for HCV markers. The HCV RNA concentration was measured, nucleotide sequences of NS5A and NS5B and Core (for HCV 2k/1b samples) fragments were obtained, the subtype was determined, and DR and polymorphic positions were analyzed.
RESULTS: Antibodies to HCV were detected in 94/286 (32.86%) samples, sequences were obtained from 52 samples. Subtypes 3a, 1b, recombinant form 2k/1b and subtype 1a were found in 28 (53.85%), 17 (32.69%), 5 (9.62%) and one (1.92%) samples, respectively. One sample harbored HCV 1b + 3a mix-infection. Reduced sensitivity (5.66%) and complete resistance (9.43%) to the NS5A inhibitor daclatasvir were most often detected. Certain gene polymorphisms were identified in the sequences.
CONCLUSION: Our results may indirectly indicate the increasing proportion of the HCV subtype 3a in the hepatitis C epidemic in the Altai Territory. Our data on DR and polymorphisms should be taken into account in antiviral therapy of patients.
AIM OF THE STUDY: The analysis of HCV genome fragments encoding NS5A and NS5B proteins in samples obtained from treatment-naïve residents of Altai Krai with newly diagnosed HIV and HCV co-infection to determine the genetic variant of HCV and genetic features of the virus associated with its sensitivity to NS5A and NS5B inhibitors.
MATERIALS AND METHODS: Blood plasma samples (n = 286) collected in 2022-2023 from HIV-infected individuals were analyzed for HCV markers. The HCV RNA concentration was measured, nucleotide sequences of NS5A and NS5B and Core (for HCV 2k/1b samples) fragments were obtained, the subtype was determined, and DR and polymorphic positions were analyzed.
RESULTS: Antibodies to HCV were detected in 94/286 (32.86%) samples, sequences were obtained from 52 samples. Subtypes 3a, 1b, recombinant form 2k/1b and subtype 1a were found in 28 (53.85%), 17 (32.69%), 5 (9.62%) and one (1.92%) samples, respectively. One sample harbored HCV 1b + 3a mix-infection. Reduced sensitivity (5.66%) and complete resistance (9.43%) to the NS5A inhibitor daclatasvir were most often detected. Certain gene polymorphisms were identified in the sequences.
CONCLUSION: Our results may indirectly indicate the increasing proportion of the HCV subtype 3a in the hepatitis C epidemic in the Altai Territory. Our data on DR and polymorphisms should be taken into account in antiviral therapy of patients.