A tumor necrosis factor-alpha (TNF-alpha) promoter polymorphism is associated with chronic hepatitis B infection

Clinical and Experimental Immunology
T HöhlerC Rittner

Abstract

Cytokines such as TNF-alpha and interferon gamma (IFN-gamma) are important for the elimination of infected hepatocytes during acute hepatitis B virus (HBV) infection. Two G versus A transitions in the TNF-alpha promoter region at positions -308 and -238 possibly influence TNF-alpha expression. We investigated these TNF-alpha polymorphisms in 71 patients with chronic HBV infection, in 32 subjects that had spontaneously recovered from acute HBV infection, and in 99 healthy controls. The -238 A promoter variant was present in 18 (25%) of 71 patients with chronic HBV infection compared with two (6%) of 32 subjects with acute infection (P<0.04), and seven (7%) of 99 controls (P<0.003). By contrast, the prevalence of the variant at position -308 was similar in all investigated groups. The observed differences could not be explained by linkage disequilibrium to HLA-B or -DRB1* alleles. These findings suggest an association between the TNF-alpha promoter polymorphism at position -238 and the development of chronic HBV infection. This promoter variant appears to be linked to defective viral clearance.

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