A novel substitution in NS5A enhances the resistance of hepatitis C virus genotype 3 to daclatasvir

• Autor(a) principal: Fernandes Campos, Guilherme Rodrigues [UNESP]
• Data de Publicação: 2021
• Outros Autores: Ward, Joseph, Chen, Shucheng, Bittar, Cintia [UNESP], Vilela Rodrigues, Joao Paulo, Candolo Martinelli, Ana de Lourdes, Souza, Fernanda Fernandes, Leira Pereira, Leonardo Regis, Rahal, Paula [UNESP], Harris, Mark
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1099/jgv.0.001496; http://hdl.handle.net/11449/210678
• topic: hepatitis C virus; genotype 3; NS5A; DAA resistance

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.