Association between single nucleotide polymorphisms in the ADD3 gene and susceptibility to biliary atresia

Based on the results of previous studies, the ADD3 gene, located in the 10q24.2 region, may be a susceptibility gene of biliary atresia (BA). In this study, two single nucleotide polymorphisms (SNPs) in the ADD3 gene, rs17095355 C/T and rs10509906 G/C, were selected to investigate whether there is an association between these SNPs and susceptibility to BA in a Chinese population. A total of 752 Han Chinese (134 BA cases and 618 ethnically matched healthy controls) were included in the present study. The ADD3 gene polymorphisms were genotyped using a TaqMan genotyping assay. Positive associations were found for the SNP rs17095355 in the codominant model; specifically, the frequencies of the CT and TT genotypes and the T allele were higher in the cases than the controls, demonstrating a significant risk for BA (odds ratio [OR] = 1.62, 95% confidence interval [CI] = 1.02-2.58; OR = 2.89, 95% CI = 1.72-4.86; and OR = 1.75, 95% CI = 1.34-2.29, respectively). Regarding rs10509906, the per-C-allele conferred an OR of 0.70 (95% CI = 0.49-1.00) under the additive model. A greater risk of BA was associated with the T(a)-G(b) (a for rs17095355 and b for rs10509906) haplotype (OR = 1.82, 95% CI = 1.27-2.61) compared with the C(a)-C(b) haplotype. This study suggests that the ADD3 gene plays an important role in BA pathogenesis and reveals a significant association between two SNPs, rs17095355 and rs10509906, and BA.