Sequence evolution of putative cytotoxic T cell epitopes in NS3 region of hepatitis C virus.

Abstract:

AIM:Quasispecies of hepatitis C virus (HCV) are the foundation for rapid sequence evolution of HCV to evade immune surveillance of hosts. The consensus sequence evolution of a segment of HCV NS3 region, which encompasses putative cytotoxic T cell epitopes, was evaluated. METHODS:Three male patients, infected with HCV through multiple transfusions, were identified from clinical symptoms and monitored by aminotransferase for 60 months. Blood samples taken at months 0, 32, and 60 were used for viral RNA extraction. A segment of HCV NS3 region was amplified from the RNA extraction by RT-PCR and subjected to subcloning and sequencing. HLA types of these three patients were determined using complement-dependent microlymphocytotoxic assay. CTL epitopes were predicted using MHC binding motifs. RESULTS:No patient had clinical symptoms or elevation of aspartate/alanine aminotransferase. Two patients showed positive HCV PCR results at all 3 time points. The other one showed a positive HCV PCR result only at month 0. A reported HLA-A2-restricted CTL epitope had no alteration in the HLA-A2-negative carrier over 60 months. In the HLA-A2-positive individuals, all the sequences from 0 month 0 showed an amber mutation on the initial codon of the epitope. Most changes of consensus sequences in the same patient occurred on predicted cytotoxic T cell epitopes. CONCLUSION:Amber mutation and changes of consensus sequence in HCV NS3 region may be related to viral immune escape.

journal_name

World J Gastroenterol

authors

Guo HZ,Yin Y,Wang WL,Zhang CS,Wang T,Wang Z,Zhang J,Cheng H,Wang HT

doi

10.3748/wjg.v10.i6.847

keywords:

subject

Has Abstract

pub_date

2004-03-15 00:00:00

pages

847-51

issue

6

eissn

1007-9327

issn

2219-2840

journal_volume

10

pub_type

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