Variation in the hepatitis C virus NS5a region in relation to hypervariable region 1 heterogeneity during interferon treatment.

Abstract:

:The putative interferon sensitivity determining region (ISDR) in the NS5a region of the hepatitis C virus (HCV) was analyzed in 13 interferon alpha (IFN-alpha) treated patients representing genotypes 1a, 1b, and 2b. These patients had previously been followed longitudinally during treatment with respect to viral load and to virus heterogeneity using the hypervariable region 1 (HVR1) sequence as a marker. In the present study, the NS5a region was analyzed for nonresponders and sustained responders using direct DNA sequencing. While the previous results of analyzing viral composition and load showed evidence of selection, no corresponding selection of specific NS5a ISDR sequences was observed in the nonresponders, and identical ISDR sequences were observed among both sustained responders and nonresponders. Thus, we cannot verify a correlation between ISDR sequence and the observed selection of IFN-alpha-resistant quasispecies demonstrated as a restriction of HVR1 heterogeneity. This indicates that the potential for using ISDR as a diagnostic or prognostic marker during IFN-alpha treatment is limited.

journal_name

J Med Virol

authors

Odeberg J,Yun Z,Sönnerborg A,Weiland O,Lundeberg J

doi

10.1002/(sici)1096-9071(199809)56:1<33::aid-jmv6>3

subject

Has Abstract

pub_date

1998-09-01 00:00:00

pages

33-8

issue

1

eissn

0146-6615

issn

1096-9071

pii

10.1002/(SICI)1096-9071(199809)56:1<33::AID-JMV6>3

journal_volume

56

pub_type

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