A novel substitution in NS5A enhances the resistance of hepatitis C virus genotype 3 to daclatasvir.
A novel substitution in NS5A enhances the resistance of hepatitis C virus genotype 3 to daclatasvir.
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DOI:
10.1099/jgv.0.001496
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发表时间:
2021-01
期刊:
影响因子:
--
通讯作者:
Harris M
中科院分区:
文献类型:
--
作者:
Fernandes Campos GR;Ward J;Chen S;Bittar C;Vilela Rodrigues JP;Martinelli ALC;Souza FF;Pereira LRL;Rahal P;Harris M
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.
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影响因子:
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作者:
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DOI:
10.1099/jgv.0.000932
发表时间:
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期刊:
The Journal of general virology
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