TAB2基因多态性与中国西南汉族人群隐睾症易感性的相关性研究

  目的  初步探讨TAB2（transforming growth factor-beta activated kinase 1 binding protein 2）基因与中国西南地区汉族人群隐睾症发病的相关性。  方法  选取西南地区259名隐睾患者和355名成年男性健康对照，采用聚合酶链式反应-限制性片段长度多态性分析方法，对TAB2基因的3个标签单核苷酸多态性位点（tag single nucleotide polymorphism, tag SNP）rs237028、rs521845、rs652921进行基因分型，并采用卡方检验分析3个tag SNP位点与隐睾症发病的关系。  结果  本实验的3个tag SNP位点基因型频率分布均符合Hardy-Weinberg平衡，限制性酶切实验分型结果与Sanger测序结果一致。TAB2 rs237028位点的G等位基因在隐睾组中的频率高于对照组（30.9% vs. 25.6%，P=0.04，OR=1.31，95%CI:1.01～1.70），在显性遗传模型中AG/GG基因型携带者罹患隐睾症的风险升高（P=0.006，OR=1.57，95%CI:1.14～2.17）。在隐睾组中rs652921位点的TC/CC基因型频率高于对照组，差异有统计学意义（75.3% vs. 67.0%，P=0.03；OR=1.50，95%CI:1.05～2.14）。未观察到rs521845与中国人群隐睾遗传易感性的相关性。  结论  TAB2基因rs237028的AG/GG基因型和rs652921的TC/CC基因型可能与中国西南地区汉族人群罹患隐睾症的风险性增加相关。

Association Between TAB2 Gene Polymorphisms and Susceptibility to Cryptorchidism in Han Chinese Population in Southwest China

  Objective   To conduct preliminary investigation into the correlation between transforming growth factor beta-activated protein kinase 1-binding protein 2 (TAB2) gene and the incidence of cryptorchidism in Han Chinese population in Southwest China.  Methods  A total of 259 patients with cryptorchidism and 355 healthy controls from Southwest China were enrolled for the study. Polymerase chain reaction-restriction fragment length polymorphism method was used to analyze the genotype of the 3 tag single nucleotide polymorphisms (SNPs) of TAB2 gene, i.e., rs237028, rs521845 and rs652921. The Chi-square test was used to analyze the relationship between the genotype frequency of the three tag SNPs and the incidence of cryptorchidism.  Results  The distribution of the 3 tag SNPs’ alleles and genotypes were in agreement with the Hardy-Weinberg equilibrium, and the genotype results of polymerase chain reaction-restriction fragment length polymorphism assay were consistent with those of Sanger sequencing. The frequency of the G allele at TAB 2 rs237028 was significantly higher in the cryptorchidism group than that in the control group (30.9% vs. 25.6%, P=0.04, OR=1.31, 95% CI: 1.01-1.70). In the dominant model, the risk of cryptorchidism was significantly higher in AG/GG genotype carriers (P=0.006, OR=1.57, 95% CI: 1.14-2.17). In the cryptorchidism group, the TC/CC genotype frequency of the rs652921 locus were significantly higher than that of the control group (75.3% vs. 67.0%, P=0.03, OR=1.50, 95% CI: 1.05-2.14). Correlation between rs521845 and susceptibility to cryptorchidism was not observed in the Han Chinese population.  Conclusion  The AG/GG genotype of rs237028 locus and the TC/CC genotype of rs652921 locus of the TAB2 gene may be associated with increased risks of cryptorchidism in Han Chinese population in southwest China.