Naturally occurring HCV NS5A/B inhibitor resistance-associated mutations to direct-acting antivirals

Antiviral Therapy
Linh Thuy NguyenIrish Hepatitis C Outcomes Research Network

Abstract

Direct-acting antivirals (DAAs) have significantly improved the treatment response in HCV chronic infection with higher potency and better tolerance. We established the prevalence of naturally occurring NS5A and NS5B inhibitor resistance-associated mutations (RAMs) in HCV genotype (GT)-1 chronically infected individuals in Ireland. In a multicentre cohort study, employing sequencing-based analysis, the presence of RAMs was determined in the HCV NS5A (n=119) and the NS5B (n=60). Naturally occurring RAMs in NS5A (M28V, R30Q, L31I, P58S, E62D and Y93H) were identified in 14.3% (17/119) of cases. Notably, the major RAM Y93H was found in 15.2% (7/46) of GT-1b versus none (0/73) in GT-1a (P=0.0009). The frequency of Y93H present in IFNL3 rs12979860 CC major homozygotes (30%, 3/10) was higher than in the non-CC group (11.1%, 4/36). GT-1b-infected individuals harbouring Y93H had significantly higher viral loads than those without this mutation (P=0.006). Additionally, two novel insertions in GT-1a and GT-1b were identified in the NS5A interferon sensitivity-determining region. In NS5B, only minor pre-existing RAMs (L159F, C316N and I434M) were detected in 10% (6/60) of samples. The proportion of individuals harbouring multiple RAMs in ...Continue Reading

Citations

Jun 25, 2016·Viruses·Ahmed Atef MesalamPhilip Meuleman
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