1. Naturally Occurring Resistance-Associated Variants to Hepatitis C Virus Direct-Acting Antiviral Agents in Treatment-Naive HCV Genotype 6a-Infected Patients
- Author
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Zhi-xin Zhao, Zhanyi Li, Yutian Chong, Ying Liu, Ying Zhang, Xiaoyan Guo, Qingxian Cai, Xiaoqiong Shao, Guoli Lin, and Qiumin Luo
- Subjects
Adult ,Male ,0301 basic medicine ,Genotype ,Article Subject ,Hepatitis C virus ,Hepacivirus ,lcsh:Medicine ,Drug resistance ,Viral Nonstructural Proteins ,medicine.disease_cause ,Antiviral Agents ,General Biochemistry, Genetics and Molecular Biology ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,Drug Resistance, Viral ,medicine ,Humans ,NS5A ,NS5B ,General Immunology and Microbiology ,biology ,lcsh:R ,virus diseases ,General Medicine ,Hepatitis C ,medicine.disease ,biology.organism_classification ,Virology ,digestive system diseases ,030104 developmental biology ,chemistry ,Mutation ,Female ,030211 gastroenterology & hepatology ,Nested polymerase chain reaction ,Research Article - Abstract
Background and Objective. The direct-acting antiviral agents (DAAs) antiviral therapy has drastically improved the prognosis of hepatitis C virus (HCV) patients. However, the viral drug resistance-associated variants (RAVs) can limit the efficacy of DAAs. For the HCV-6a is not the predominant prevalent genotype; the data on the prevalence of naturally occurring RAVs in it is scarce. Our study aims to assess the prevalence of RAVs in treatment-naive HCV-6a patients. Methods. Nested PCR assays were performed on 95 HCV-6a patients to amplify HCV viral regions of NS3, NS5A, and NS5B. Results. In NS3/4A region, we detected Q80K in 95.5% isolates (84/88) and D168E in 2.3% isolates (2/88). In NS5A region, we detected Q30R in 93.2% isolates (82/88), L31M in 4.6% isolates (4/88), and H58P in 6.8% isolates (6/88). In NS5B region, we detected A15G in 2.3% isolates (2/88), S96T in 1.1% isolates (1/88), and S282T in 20.7% isolates (17/88) and we detected I482L in 100% isolates (4/4), V494A in 50% isolates (2/4), and V499A in 100% isolates (4/4). Conclusions. RAVs to DAAs preexist in treatment-naive HCV-6a patients. Further studies should address the issue of the impact of RAVs in response to DAA therapies for HCV-6a patients.
- Published
- 2017