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Analysis of Mutations within the 5' Untranslated Region, Interferon Sensitivity Region, and PePHD Region as a Function of Response to Interferon Therapy in Hepatitis C Virus-Infected Patients in India

Gupta, Romi and Subramani, Murugan and Khaja, Mohammed N and Madhavi, Chandra and Roy, Swagata and Habibullah, Chittoor M and Das, Saumitra (2006) Analysis of Mutations within the 5' Untranslated Region, Interferon Sensitivity Region, and PePHD Region as a Function of Response to Interferon Therapy in Hepatitis C Virus-Infected Patients in India. In: Journal of Clinical Microbiology, 44 (3). pp. 729-737.

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Abstract

Mutations in several subgenomic regions have been implicated in influencing response to interferon therapy; however, a comprehensive picture of Indian patients was lacking. Based on the viral load and clinical factors, 10 out of 15 patients were found to be complete responders, whereas 5 patients were nonresponders. The pretreatment viral RNA load of the patients was found to be between 5.20 and 6.13 $log_{10}$ IU/ml, which eventually fell to 2.77 $log_{10}$ IU/ml after 24 weeks of treatment, whereas in the case of nonresponders, the average was 5.38 $log_{10}$ IU/ml. In order to study the influence of the hepatitis C virus genotype on the response to interferon therapy, the 5' untranslated region sequences of the samples were analyzed, which showed that genotype 3 patients responded better than genotype 1 patients. Additionally, the mutations in the interferon sensitivity-determining region (ISDR) of the NS5A protein and the double-stranded RNA-activated protein kinase-eukaryotic initiation factor 2 alpha phosphorylation homology domain (PePHD) of the E2 envelope protein, before and after treatment, were compared with nonresponder prototype J. Although, no clear correlation was found in the case of the mutated ISDR, some significant changes in residues were observed in the PePHD region, which could be helpful in understanding the molecular basis of resistance to therapy. Interestingly, analysis of the quasispecies variations showed a change in genotype in one sample during treatment, which might have contributed to the resistance. The results suggest that the mutations in different regions of the viral genome might have a concerted effect on the response to interferon therapy.

Item Type: Journal Article
Additional Information: At present DOI is not working. Copyright of this article belongs to American Society for Microbiology.
Department/Centre: Division of Biological Sciences > Microbiology & Cell Biology
Date Deposited: 01 Jun 2006
Last Modified: 14 Oct 2008 10:10
URI: http://eprints.iisc.ernet.in/id/eprint/7269

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