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:
The Journal of general virology
影响因子:
--
通讯作者:
Harris M
Harris M
中科院分区:
其他
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

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丙型肝炎病毒(丙型肝炎病毒)基因3型对直接作用抗病毒药物(DAA),特别是针对NS5A蛋白的药物,表现出高水平的基线和获得性耐药。为了了解这种耐药性,我们研究了一组接受NS5A DAA、达拉塔韦和核苷类似物索布韦治疗的巴西患者。在治疗后复发的患者中,我们观察到一种新的NS5A氨基酸残基98[丝氨酸到甘氨酸(S98G)]的替换。利用两个基因3型亚基因组复制子评价了该替换对复制适合性和对DAA抗性的影响。S98G对复制的影响不大,但结合以前描述的抗性相关替换(RAS),Y93H导致达拉塔韦的抗性显著增加。这一结果表明,取代的组合可能驱动高水平的DAA抗性,并为NS5A靶向DAA的作用机制提供一些线索。
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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