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• W2050871775 abstract "The inherent sequence diversity of the hepatitis C virus (HCV) with the existence of multiple genotypes that differ up to 20% at the amino acid level represents one of the major obstacles for immune control. Accordingly, immune control of a heterologous virus challenge, particularly across genotypes, is difficult to achieve; however, the overall role of genotype-specific sequence differences has not yet been defined at the epitope level. The aim of this study was to determine the role of genotype-specific sequence differences for the CD8+ T cell response against HCV. We analyzed a cohort of anti-HCV–positive injection drug users infected with HCV genotype 1 (n = 17) or genotype 3 (n = 22) or undetectable HCV-RNA (n = 14) with overlapping peptides covering consensus sequences of NS3 from both genotypes. Importantly, the majority of HCV-specific CD8 T cells were specific for one genotype only indicating that sequence differences between genotypes are relevant at the epitope level. Interestingly, T cells active against both genotypes were significantly more frequent in HCV-RNA–negative subjects. Of note, we identified five subjects with undetectable viremia and coexistence of two T cell populations—one for each genotype—suggesting immune control of two different genotypes. Conclusion: We systematically analyzed the degree of cross-genotype reactivity of HCV-specific T cells and have shown that CD8 responses targeting different HCV genotypes can be primed in the same individual and that such responses potentially characterize a subgroup among injection drug users being protected from chronic HCV infection. (HEPATOLOGY 2009.)" @default.
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• W2050871775 date "2009-05-29" @default.
• W2050871775 modified "2023-10-07" @default.
• W2050871775 title "Degree of cross-genotype reactivity of hepatitis C virus-specific CD8+ T cells directed against NS3" @default.
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• W2050871775 doi "https://doi.org/10.1002/hep.23096" @default.
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