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en The Relationship Between HCV-NS5A Gene Mutations and Resistance to Combination Therapy in Patients with HCV- Genotype 1-B میکروب شناسی Microbiology مقالات اصلی Original Article <div style="text-align: justify;">Background: 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. Methods: 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. Results: 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. 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. Therefore, sequencing of these regions does not appear to be a suitable tool for predicting treatment outcomes.</div> Genotype b1, Hepatitis C virus, Mutation, Non-structural protein (NS5A), Response to combination therapy 233 242 http://rbmb.net/browse.php?a_code=A-10-568-2&slc_lang=en&sid=1 Hamed Esmaeil Lashgarian 100319475328460012637 100319475328460012637 Yes Department of Medical Biotechnology, School of Medicine, Lorestan University of Medical Sciences, Khorramabad, Iran. Ali Valibeik 100319475328460012638 100319475328460012638 No Department of Clinical Biochemistry, School of Medicine, Lorestan University of Medical Sciences, Khorramabad, Iran. Abdolrazagh Marzban 100319475328460012639 100319475328460012639 No Razi Herbal Medicines Research Center, Lorestan University of Medical Sciences, Khorramabad, Iran Maryam Karkhane 100319475328460012640 100319475328460012640 No Department of Clinical Biochemistry, School of Medicine, Lorestan University of Medical Sciences, Khorramabad, Iran. Kiana Shahzamani shahzamani.k@lums.ac.ir 100319475328460012641 100319475328460012641 No Isfahan Gastroenterology and Hepatology Research Center (IGHRC), Isfahan University of Medical Sciences, Isfahan, Iran.