151. Natural prevalence of NS3 gene resistance-associated substitutions (RASs) in patients with chronic hepatitis C from the state of Para/Brazil
- Author
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Heloisa Marceliano Nunes, Pedro Eduardo Bonfim de Freitas, and Desirée Lopes da Silva
- Subjects
Adult ,Male ,Simeprevir ,Cancer Research ,medicine.medical_treatment ,Hepatitis C virus ,Mutation, Missense ,Hepacivirus ,Viral Nonstructural Proteins ,Biology ,medicine.disease_cause ,Antiviral Agents ,Hepacivirus / gen?tica ,DNA sequencing ,Antivirais ,03 medical and health sciences ,Virology ,Drug Resistance, Viral ,medicine ,Humans ,Protease Inhibitors ,Prospective Studies ,Genetic variability ,Inibidores de Proteases ,Gene ,Aged ,030304 developmental biology ,0303 health sciences ,NS3 ,Protease ,030306 microbiology ,virus diseases ,Hepatitis C, Chronic ,Middle Aged ,Hepatite C Cr?nica / patologia ,Infectious Diseases ,Amino Acid Substitution ,Grazoprevir ,Resist?ncia a Medicamentos / gen?tica ,Female ,Brazil - Abstract
Minist?rio da Sa?de. Secretaria de Vigil?ncia em Sa?de. Instituto Evandro Chagas. Ananindeua, PA, Brasil. Minist?rio da Sa?de. Secretaria de Vigil?ncia em Sa?de. Instituto Evandro Chagas. Ananindeua, PA, Brasil. Minist?rio da Sa?de. Secretaria de Vigil?ncia em Sa?de. Instituto Evandro Chagas. Ananindeua, PA, Brasil. The resistance of hepatitis C virus (HCV) to direct-acting antiviral agents, used in chronic hepatitis C treatment, consists of a natural process resulting from resistance-associated substitutions (RASs) at specific amino acid regions. To identify and establish the natural prevalence of RASs in the NS3 gene in patients with chronic hepatitis C in the state of Par?, northern Brazil. Molecular analysis was performed on a total of 35 patients infected with HCV genotype 1, who were treatment-naive to protease inhibitors. HCV RNA was extracted from plasma and the NS3 region was amplified and submitted to DNA sequencing (Sanger). The general natural prevalence of RASs in the NS3 gene was 37.5 % (Y56F and S122T). The substitutions Y56F (34.3 %), S122T (3.1 %), V132I (15.6 %) and V170I (9.3 %) were identified. Y56F and S122T provide resistance to the protease inhibitors grazoprevir and simeprevir, respectively. All amino acid substitutions in the NS3 gene, including RASs, identified in patients from the state of Par? were present in other Brazilian studies. The natural presence of RASs in this study reflects the elevated genetic variability of HCV.
- Published
- 2021