Abstract
Hepatitis C virus (HCV) is one of the major causes of chronic liver disease, as it holds a significant role in developing liver cirrhosis and hepatocellular carcinoma. Combination therapy with Pegaferon and Ribavirin leads to viral clearance of only 50% of patients. During the host antiviral response, protein kinase R (PKR) interacts with eukaryotic translation initiation factor 2 alpha (eIF2α), that leads to the inhibition of viral protein synthesis. The viral NS5A protein appears to interfere with this antiviral action, evading the host immune response. However, mutations in the NS5A gene have been observed to render HCV more susceptible to treatment. The aim of this study was to determine the mutations present in the IFN Sensitivity Determining Region (ISDR) and NS5A-PKRbinding domain regions in chronic HCV infected patients before and after therapy. Viral RNA was isolated from the plasma of 52 chronic HCV infected patients before and after treatment. RT-Nested PCR reaction was used to reverse transcription and amplification of target fragment using the specific primers. Sequence analysis revealed no relationship between NS5A mutations and response to treatment. No significant difference was found between the mutations before and 3 months after treatment among responders and non-responders. This study showed that the number of mutations in NS5A did not significantly differ between the patients who responded to treatment and the patients that did not. Therefore, sequencing of these regions does not appear to be a suitable tool for predicting treatment outcomes.
Highlights
Hepatitis C virus (HCV) infection commonly results in the development of chronic hepatitis
Data analysis In this study, data was analyzed after the amplification of codons 2209 to 2274 of the protein kinase R binding domain (PKRBD) region extracted from the plasma of 24 HCV patients
Infection with HCV remains a major disease burden worldwide contributing to significant morbidity and mortality associated with liver disease, including liver cirrhosis and hepatocellular carcinoma
Summary
Hepatitis C virus (HCV) infection commonly results in the development of chronic hepatitis. Determining Region (ISDR) within the protein kinase R binding domain (PKRBD) of HCV-1b. The aim of this study was to determine the mutations present in the IFN Sensitivity Determining Region (ISDR) and NS5A-PKRbinding domain regions in chronic HCV infected patients before and after therapy. Methods: Viral RNA was isolated from the plasma of 52 chronic HCV infected patients before and after treatment. Conclusions: This study showed that the number of mutations in NS5A did not significantly differ between the patients who responded to treatment and the patients that did not. Sequencing of these regions does not appear to be a suitable tool for predicting treatment outcomes
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