Association between gamma aminobutyric acid (GABA) type B receptors gene polymorphisms and idiopathic generalized epilepsy

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2011
Eroğlu, Ezgi
Epilepsy is neurological disorder affecting 0.5 to 1% of the population all around the world. It is characterized by the seizures, which are the sudden alterations of behavior due to a temporary change in electrical functioning of the brain. Idiopathic generalized epilepsy (IGE) accounts for one-fifth of all the other epilepsy types, and several gene mutations were identified as the causes of IGE. In general, voltage-gated and ligand-gated ion channel mutations are linked with seizure formation. Gamma amino butyric acid (GABA), the most important inhibitory neurotransmitter of the central nervous system, and its receptors are commonly mentioned in the pathophysiology of epilepsies. Decrease in the inhibitory effect of GABA in neurons causes epileptic discharges resulting in seizure development. The study population consisted of a total of 176 idiopathic generalized epilepsy (IGE) patients, 83 subjects having psychogenic non-epileptic seizures (PNES), 86 non-epileptic control subjects from Turkey. Total blood samples were obtained from Gülhane Military Medical Academy Hospital Neurology Department, Ankara. There was no statistically difference between the patient and control groups in terms of age. Genomic DNA isolations were performed and genotyping of G1465A and C59T polymorphisms of GABAB1 gene; rs1999501, rs967932, rs3780428 and rs944688 polymorphisms of GABAB2 gene were determined by PCR-RFLP technique. In this study, GABAB1 G1465A polymorphic allele was not observed in Turkish population. For GABAB1 C59T polymorphism, polymorphic allele frequencies were found as 0.097 in IGE patients; 0.072 in PNES subjects and 0.105 in non-epileptic control subjects. No significant difference is identified for C59T polymorphism in all three groups. Four SNPs of GABAB2 were studied; rs967932 was found to increase the risk of IGE 3.6-fold (P=0.031) compared to PNES subjects, polymorphic allele frequencies were found as 0.060 in IGE patients; 0.018 in PNES subjects and 0.035 in non-epileptic control subjects. For rs1999501 polymorphism, polymorphic allele frequencies were found as 0.077 in IGE patients; 0.048 in PNES subjects and 0.093 in non-epileptic control subjects. For rs3780428 polymorphism, polymorphic allele frequencies were found as 0.267 in IGE patients; 0.235 in PNES subjects and 0.256 in non-epileptic control subjects. For rs944688 polymorphism, polymorphic allele frequencies were found as 0.196 in IGE patients; 0.260 in PNES subjects and 0.227 in non-epileptic control subjects. No significant difference was identified for rs1999501, rs3780428 and rs944688 polymorphisms among IGE patients, PNES subjects and non-epileptic control groups. IGE risk was 6.54-fold higher for subjects having combined GA genotype for rs967932 and GG genotype for rs3780428 when compared with PNES subjects (P=0.042). The combination of CC genotype for rs1999501, GG genotype for rs967932 and TT genotype for rs944688 had around 9-fold protective effect against IGE when both compared with PNES subjects (P=0.038) and non-epileptic control subjects (P=0.041).

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Citation Formats
E. Eroğlu, “Association between gamma aminobutyric acid (GABA) type B receptors gene polymorphisms and idiopathic generalized epilepsy,” M.S. - Master of Science, Middle East Technical University, 2011.