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- W3096393429 abstract "Hepatitis C virus (HCV) genotype 3 presents a high level of both baseline and acquired resistance to direct-acting antivirals (DAAs), particularly those targeting the NS5A protein. To understand this resistance we studied a cohort of Brazilian patients treated with the NS5A DAA, daclatasvir and the nucleoside analogue, sofosbuvir. We observed a novel substitution at NS5A amino acid residue 98 [serine to glycine (S98G)] in patients who relapsed post-treatment. The effect of this substitution on both replication fitness and resistance to DAAs was evaluated using two genotype 3 subgenomic replicons. S98G had a modest effect on replication, but in combination with the previously characterized resistance-associated substitution (RAS), Y93H, resulted in a significant increase in daclatasvir resistance. This result suggests that combinations of substitutions may drive a high level of DAA resistance and provide some clues to the mechanism of action of the NS5A-targeting DAAs." @default.
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- W3096393429 date "2021-01-01" @default.
- W3096393429 modified "2023-10-15" @default.
- W3096393429 title "A novel substitution in NS5A enhances the resistance of hepatitis C virus genotype 3 to daclatasvir" @default.
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- W3096393429 doi "https://doi.org/10.1099/jgv.0.001496" @default.
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