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• W2016228620 abstract "The HCV-specific HLA-A2-restricted NS3(1073) epitope is one of the most frequently recognized epitopes in hepatitis C. NS3(1073)-specific T-cell responses are associated with clearance of acute HCV-infection. Therefore this epitope is an interesting candidate for a HCV-peptide vaccine. However, heterogeneity between genotypes and mutations in the epitope has to be considered as an obstacle. We here identified 34 naturally occurring NS3(1073)-variants, as compared with the wild type genotype-1 variants (CVNGVCWTV/CINGVCWTV) by sequencing sera of 251 Greek and German patients and searching for published HCV-genomes. The frequency of variants among genotype-1 patients was 10%. Importantly, HLA-A2 binding was reduced only in 3 genotype 1 mutants while all non-genotype 1 variants showed strong HLA-A2-binding. By screening 28 variants in ELISPOT assays from T cell lines we could demonstrate that HCV-NS3(1073)-wild-type-specific T-cells displayed cross-genotype-reactivity, in particular against genotypes 4-6 variants. However, single aa changes within the TCR-binding domain completely abolished recognition even in case of conservative aa exchanges within genotype-1. NS3(1073)-specific T-cell lines from recovered, chronically infected, and HCV-negative individuals showed no major difference in the pattern of cross-recognition although the proliferation of NS3(1073)-specific T-cells differed significantly between the groups. Importantly, the recognition pattern against the 28 variants was also identical directly ex vivo in a patient with acute HCV infection and a healthy volunteer vaccinated with the peptide vaccine IC41 containing the NS3(1073)-wild-type peptide. Thus, partial cross-genotype recognition of HCV NS3(1073)-specific CD8 T cells is possible; however, even single aa exchanges can significantly limit the potential efficacy of vaccines containing the NS3(1073)-wild-type peptide." @default.
• W2016228620 created "2016-06-24" @default.
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• W2016228620 date "2008-07-01" @default.
• W2016228620 modified "2023-10-02" @default.
• W2016228620 title "Cross-genotype-reactivity of the immunodominant HCV CD8 T-cell epitope NS3-1073" @default.
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• W2016228620 doi "https://doi.org/10.1016/j.vaccine.2008.05.045" @default.
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