Objective: To investigate the association between two single nucleotide polymorphisms (SNPs), rs9390754 and rs4840200, in the glutamate receptor 2 (GRIK2) gene and the genetic susceptibility to epilepsy (EP) in the Han population in Central China.
Methods: A case-control study was performed in 284 EP children (including 132 children with refractory epilepsy) and 315 normal children from Central China. Polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) was used to determine the genotypes of the two SNPs rs9390754 and rs4840200. The genotype frequency was compared between groups.
Results: The frequencies of GG, GA, and AA genotypes of SNP rs9390754 showed a significant difference between the EP and normal control groups (P=0.016). The allele frequency also showed a significant difference between the two groups (P=0.002). The frequencies of CC, CT, and TT genotypes of SNP rs4840200 and allele frequency showed no significant differences between the two groups. The C allele frequency of SNP rs4840200 in the refractory EP subgroup was significantly higher than in the non-refractory EP subgroup (OR=1.435, 95% CI: 1.021-2.016, P=0.037).
Conclusions: In the Han population in Central China, the polymorphisms of SNP rs9390754 in the GRIK2 gene may be associated with EP susceptibility, and the C allele of SNP rs4840200 may be a genetic risk factor for the development of drug resistance in children with EP.
目的: 探讨我国中部地区汉族人群中谷氨酸受体2(GRIK2)基因两个SNP位点rs9390754和rs4840200的多态性与儿童癫癎遗传易感性的关系。
方法: 利用病例对照研究方法, 选取来自我国中部地区的284例癫癎患儿(包括132例难治性癫癎)以及315例正常体检儿童(对照组)作为研究对象。利用限制性片段长度多态性(PCR-RFLP)的方法测定SNP位点rs9390754和rs4840200的多态性分布, 并比较组间的基因型频率的差异。
结果: 癫癎组儿童SNP位点(rs9390754)的基因型(GG、GA、AA)频率与对照组相比差异有统计学意义(P=0.016), 等位基因频率差异也有统计学意义(P=0.002)。而SNP位点(rs4840200)基因型(CC、CT、TT)频率以及等位基因频率与对照组相比差异均无统计学意义。难治性癫癎亚组SNP位点(rs4840200)C等位基因频率高于非难治性癫癎亚组(OR=1.435, 95%CI:1.021~2.016, P=0.037)。
结论: 我国中部地区汉族人群GRIK2基因SNP位点(rs9390754)的多态性与癫癎的易感性相关, 而SNP位点(rs4840200)的C等位基因可能是癫癎患儿发生耐药的遗传学危险因素。