Abstract
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Abstract; Abstract; Back ground; Contradicting results from many laboratories on the role of genetic factors in the susceptibility/resistance to hepatitis B infection have been reported. In this review we examined 27 published full research articles and assessed the role of Th1/Th2 cytokine promoter and vitamin D receptor gene polymorphisms. We summarized the available data on the relationship between the gene polymorphisms and susceptibility/resistance to hepatitis B virus infection together with likely disease evolution to come up with candidate single nucleotide polymorphisms implicated in the disease state with the population.; Method; The study was done in tandem with the PRISMA standards and the Cochran’s Q test, I2 statistics for heterogeneity and the Odds ratio were calculated using a commercially available soft ware called MedCalcs (http://www.medcalc.org). A random effects model was used to pool the odds ratio for heterogeneities ≥50% or else a fixed effects model was used. All analyses were done at 95% Confidence Interval and a P<0.05 was considered statistically significant.; Results; We found that IL-10-592C/A genotype AA (P=0.017, OR=0.752, 95%CI=0.595 to 0.950) and TNF-α-238G/A genotype AA+ AG (P<0.001, OR=0.407, 95%CI=0.005 to 30.1) were significantly associated with reduced risk of hepatitis B infection by the random effects model. TNF-α-238G/A genotype GG had the risk of chronic infection (OR=3.587, 95% CI= 0.127 to 101.176) under the random effect model. Most of the other SNPs had borderline risk of HBV infection (OR 0.6 to 1.12) with a few cases of high risk, IL-10-1082A/G genotype AA (OR=1.608, 95%CI=0.861 to 3.003) and reduced risk, IL-10-1082A/G genotype AG (OR=0.485, 95% CI=0.232 to 1.014); Conclusion; We found that IL-10-592C/A genotype AA and TNF-α-238G/A genotype AA+ AG were significantly associated with reduced risk of hepatitis B infection.