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• W2018129430 abstract "Summary. Hepatitis C virus (HCV) hypervariable region 1 (HVR1) is the most variable region of the viral genome and its heterogeneity reflects the virus-host interplay during chronicity. Paediatric HCV-infected patients develop liver disease with typical clinical features. Here, the evolution of HVR1 and its adjacent regions were ascertained in plasma samples of two HCV-positive children during a 5-year follow-up period. We report an almost complete conservation of the HVR1 amino acid sequence over time, with underlying nucleotide variability both within and outside HVR1, suggesting some kind of constraint on virus evolution, particularly within HVR1. Although overall dN/dS rates [rates of nonsynonymous nucleotide substitutions per nonsynonymous site (dN) and synonymous nucleotide substitutions per synonymous site (dS)] were <1 in both patients, a high resolution analysis of selection pressures exerted at the codon level revealed few sites subject to selection and an absolute predominance of invariable positions within HVR1. The HVR1 amino acid sequences showed the antigenic properties expected for this region. Taken together, these data suggest peculiar evolutionary dynamics in our patients, which could be attributed to a mechanism of nucleotide invariability along with purifying selection operating on the HVR1. The lack of HVR1 variability may reflect the adaptation of the virus to a particular environment within each patient or a phenomenon of immune tolerance generated in these immunocompetent patients earlier in life." @default.
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• W2018129430 date "2009-05-01" @default.
• W2018129430 modified "2023-10-16" @default.
• W2018129430 title "Evolution of hepatitis C virus hypervariable region 1 in immunocompetent children born to HCV-infected mothers" @default.
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• W2018129430 doi "https://doi.org/10.1111/j.1365-2893.2009.01071.x" @default.
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