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- W1996920009 abstract "Background/Aims: A sequence of 40 amino acids within the nonstructural protein 5A of hepatitis C virus (HCV) has been suggested to be an interferon sensitivity determining region (ISDR). The variations in the ISDR after 12–14 years of chronic infection and the correlation between ISDR and interferon response were studied in patients who were infected by the same HCV isolate. Methods: We determined theHCV-ISDRs of 13 chronically infected patients by direct sequencing of polymerase chain reaction products. All patients were infected by isolate HCV-AD78, but differed with respect to their sensitivity to interferon. Four patients were complete responders, two patients were non-responders, and seven showed a partial response. Results: The ISDR of HCV-AD78 differed from a prototypical HCV-1b sequence in one amino acid and was therefore classified as an intermediate type. Direct sequencing of the HCV-ISDRs of the patients 12–14 years after infection, but before interferon therapy, revealed a rate of 2.2×10−3 nucleotide substitutions per site per year, resulting in only single intermediate type amino acid exchanges. All sequences ranked with the intermediate type. Moreover, during interferon treatment no selection to a wild type ISDR was observed in five partial responders. Conclusions: Within the homogeneous patient group examined here, no correlation was found between the ISDR and the interferon response. Recent studies found only a small number of mutant type ISDRs in Europe. Additionally, our results indicate that the ISDR is a stable sequence element. This provides an explanation for the divergent data relating to the importance of the ISDR in different geographical regions." @default.
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- W1996920009 date "1998-09-01" @default.
- W1996920009 modified "2023-10-09" @default.
- W1996920009 title "The “interferon sensitivity determining region” of hepatitis C virus is a stable sequence element" @default.
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- W1996920009 doi "https://doi.org/10.1016/s0168-8278(98)80051-2" @default.
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