ABSTRACT.To evaluate the association between paired box 9 (PAX9) gene polymorphisms and tooth agenesis in isolated humans, we performed a comprehensive meta-analysis. We examined 6 casecontrol studies, with a total of 855 hypodontia cases and 1201 healthy controls. The G allele and G carrier (AG + GG) of A1031G were positively associated with hypodontia susceptibility. Similarly, the T allele and T carrier (CT + TT) of C912T and rs12881240 in the PAX9 gene also indicated an increased risk of hypodontia. In addition, the C allele and C carrier (CG + CC) of 718C, IVS2-109, rs4904210, and rs7143727 showed no significant association with oligodontia. The G allele and G carrier (AG + GG) of IVS2-41 in the PAX9 gene were not related factors. Interestingly, the genotype (AG + GG) of IVS2-54 in the PAX9 gene may be a protective factor for oligodontia (odds ratio = 0.21, 95% confidence interval = 0.07-0.63, P = 0.005). However, no significant differences were found in the allele frequency of IVS2-54 in the PAX9 polymorphism between controls and subjects with sporadic tooth agenesis. In conclusion, our meta-analysis results revealed 4 genetic sites of the PAX9 gene involved in hypodontia cases, of which 3 sites may be risk factors and 1 may have a protective role.
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