Impact of SLC23A1 and SLC23A2 Polymorphisms on the Risk for Preeclampsia in a Chinese Han Population

Solute carrier family 23 member 1 (SVCT1) and solute carrier family 23 member 2 (SVCT2), encoded by SLC23A1 and SLC23A2, may be associated with preeclampsia (PE). The purpose of this study was to investigate the association between polymorphisms of SLC23A1 and SLC23A2 and PE in Chinese Han population. The primers and double-labeled probes were designed according to the SNPs of rs10063949 in SLC23A1, rs6133175 and rs1279683 in SLC23A2. Genomic DNA was extracted from peripheral blood of 2,066 subjects (1,029 with PE and 1,037 without PE), and Taqman real-time PCR was used to detect the three SNPs. We observed a significant difference in genotypic frequency of the SLC23A2 rs6133175 polymorphism (χ²=8.08, p=0.02) between PE patients and controls, while no significant differences were found in the allelic frequencies (χ²=1.45, p=0.23). Then we fractionized these samples into the dominant model of the allele G (GG/AG+AA group) or the recessive model of the A allele (AA/AG+GG group), and observed a significant difference under the recessive model of the A allele (p=0.01, OR=0.71, 95% CI 0.55-0.92). Furthermore, there were no significant differences in the genotypic and allelic frequencies of rs10063949 and rs1279683 between PE patients and controls (for rs10063949, χ²=2.96, p=0.23 by genotype, χ²=2.11, p=0.15 by allele; for rs1279683, χ²=1.52, p=0.47 by genotype, χ²=0.64, p=0.44 by allele). We first found that SLC23A2 rs6133175 may be the certain genetic polymorphisms modulating their effects in the development of PE in a Chinese Han population and the AG or GG genotypes may be a risk factor for PE.