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To explore genetic mechanism of genetic generalized epilepsies (GGEs) is challenging because of their complex heritance pattern and genetic heterogeneity.  KCNJ10  gene encodes Kir4.1 channels and plays a major role in modulating resting membrane potentials in excitable cells. It may cause GGEs if mutated. The purpose of this study was to investigate the possible association between  KCNJ10  common variants and the susceptibility and drug resistance of GGEs in Chinese population. The allele-specific MALDI–TOF mass spectrometry method was used to assess 8 single nucleotide polymorphisms (SNPs) of  KCNJ10  in 284 healthy controls and 483 Chinese GGEs patients including 279 anti-epileptic drug responsive patients and 204 drug resistant patients. We found the rs6690889 TC+TT genotypes were lower frequency in the GGEs group than that in the healthy controls (6.7%  vs  9.5%,  p  = 0.01, OR = 0.50[0.29–0.86]). The frequency of rs1053074 G allele was lower in the childhood absence epilepsy (CAE) group than that in the healthy controls (28.4%  vs  36.2%,  p  = 0.01, OR = 0.70[0.53–0.93]). The frequency of rs12729701 G allele and AG+GG genotypes was lower in the CAE group than that in the healthy controls (21.2%  vs  28.4%,  p  = 0.01, OR = 0.74[0.59–0.94] and 36.3%  vs  48.1%,  p  = 0.01, OR = 0.83[0.72–0.96], respectively). The frequency of rs12402969 C allele and the CC+CT genotypes were higher in the GGEs drug responsive patients than that in the drug resistant patients (9.3%  vs  5.6%, OR = 1.73[1.06–2.85],  p  = 0.026 and 36.3%  vs  48.1%,  p  = 0.01, OR = 0.83[0.72–0.96], respectively). This study identifies potential SNPs of  KCNJ10  gene that may contribute to seizure susceptibility and anti-epileptic drug resistance.

Common Variants of KCNJ10 Are Associated with Susceptibility and Anti-Epileptic Drug Resistance in Chinese Genetic Generalized Epilepsies