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Abstract

Interferon induced with helicase C domain 1 (IFIH1), which is a type of cytological RNA helicase protein and an important initiator of innate immune response to RNA virus infection, may play an important role in hepatitis C virus (HCV) infection outcomes. This study was conducted to investigate the association of IFIH1 gene polymorphisms with HCV clearance in Chinese Han population. A total of 1,527 subjects positive for anti-HCV and 357 chronic hepatitis C (CHC) patients were enrolled in this study. Two single nucleotide polymorphisms in IFIH1 gene (rs2111485 and rs1990760) were selected and genotyped by TaqMan real-time polymerase chain reaction. Haplotypes analysis was further performed by HaploView software and PHASE software. Our results demonstrated that the mutant alleles of rs2111485 (dominant model: odds ratio [OR] = 1.41, 95% confidence interval [CI] = 1.11–1.79) and rs1990760 (dominant model: OR = 1.63, 95% CI = 1.30–2.06) decreased the possibility of spontaneous HCV clearance, but it had no association with HCV clearance induced by interferon-alfa (IFN-α). And, CHC risk increased with the increasing number of unfavorable alleles (p _trend < 0.001). In addition, haplotype analysis also showed that the A-C protective haplotype (rs2111485-rs1997060) promoted spontaneous HCV clearance (p < 0.001). Variants of rs2111485 and rs1990760 at IFIH1 may be associated with spontaneous HCV clearance in Chinese Han population, but have no effect on HCV clearance induced by IFN-α.

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Association of rs2111485 and rs1990760 Polymorphisms of Interferon Induced with Helicase C Domain 1 Gene with Hepatitis C Virus Clearance in Chinese Han Population

Abstract

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