Association of interleukin‑28B rs12979860 and rs8099917 polymorphisms with sustained viral response in hepatitis C virus genotype 1 and 3 infected patients from the Indian subcontinent.
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Date
2016-07
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Abstract
Background: Polymorphisms of the IL28B gene (rs12979860 and rs8099917) have been shown to impact treatment
responses in hepatitis C virus (HCV) infected patients. The association of these polymorphisms with sustained viral
response (SVR) has been studied in HCV genotype 3 infected patients in India, but not in genotype 1. Objectives: This
study aimed to determine the association of IL28B gene polymorphisms and other host and viral factors with treatment
response in patients with HCV genotype 1 and 3 infection. Materials and Methods: DNA from 42 HCV‑infected
patients on antiviral therapy was analysed for the IL28B polymorphisms using polymerase chain reaction‑restriction
fragment length polymorphism (PCR‑RFLP). Bidirectional sequencing was performed on a subset of samples for
verification of PCR‑RFLP results. Information on age, weight, height, diabetic status, pre‑treatment viral load and
alanine aminotransferase (ALT) levels was obtained from clinical records. The IL28B genotypes and the other factors
were analysed for their association with SVR. Results: The frequency distribution of rs12979860 CC/CT/TT genotypes
was found to be 66.7%, 26.2% and 7.1%, respectively. For rs8099917 genotype, the TT/GT/GG distribution was 73.8%,
21.4% and 4.8%, respectively. SVR was seen in 61.9% of cases (55.6% in genotype 1 and 62.5% in genotype 3). CC
genotype at rs12979860 and TT genotype at rs8099917 were significantly higher in responders (P = 0.013 and 0.042,
respectively). Lower baseline ALT and rapid viral response were also found to be associated with SVR. On logistic
regression analysis, CC genotype at rs12979860 emerged as the most powerful predictor of treatment response.
Conclusion: IL28B polymorphisms are strong predictors of SVR in patients from the Indian subcontinent infected with
HCV genotype 3 and genotype 1.
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Keywords
Hepatitis C virus, IL28B polymorphism, interferon, rapid viral response, sustained viral response
Citation
Ranjan P, Fletcher G J, Radhakrishnan M, Sivakumar J, Premkumar P S, Goel A, Zachariah U G, Abraham P. Association of interleukin‑28B rs12979860 and rs8099917 polymorphisms with sustained viral response in hepatitis C virus genotype 1 and 3 infected patients from the Indian subcontinent. Indian Journal of Medical Microbiology. 2016 July-Sept; 34(3): 335-341.