Correlation between mutations in the interferon sensitivity-determining region of NS5A protein and viral load of hepatitis C virus subtypes 1b, 1c, and 2a

M. I. Lusida, M. Nagano-Fujii, C. M. Nidom, Soetjipto, R. Handajani, T. Fujita, K. Oka, H. Hotta

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30 Citations (Scopus)

Abstract

In the present study, we analyzed the possible relationship between interferon (IFN) sensitivity-determining region (ISDR) sequence variation of various hepatitis C virus (HCV) subtypes and serum HCV titers in Indonesian patients without IFN treatment. The viremia titers (mean ± standard deviation) of HCV subtype 1b (HCV-1b) isolates with low (three or fewer) and high (four or more) numbers of ISDR mutations were 5.4 ± 0.6 and 4.2 ± 0.9 log10 RNA copies/ml, respectively, with the difference between the two groups being statistically significant (P < 0.01). Similarly, the viremia titers of HCV-1c isolates with low and high numbers of ISDR mutations were 5.3 ± 0.6 and <3.0 ± 0.0 log10 RNA copies/ml, respectively, with the difference between the two groups being statistically significant (P < 0.01). Also, the virus titers of HCV-2a isolates with low and high numbers of ISDR mutations were 4.3 ± 0.7 and 3.5 ± 0.4 log10 RNA copies/ml, respectively, with the difference between the two groups being statistically significant (P < 0.01). Thus, our results demonstrated that virus load in Indonesian patients infected with HCV-1b, HCV-1c, or HCV-2a correlated inversely with the number of mutations in the ISDR sequence, implying the possibility that the ISDR sequence plays an important role in determining the levels of HCV viremia.

Original languageEnglish
Pages (from-to)3858-3864
Number of pages7
JournalJournal of Clinical Microbiology
Volume39
Issue number11
DOIs
Publication statusPublished - 2001
Externally publishedYes

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