Multidrug resistance in patients undergoing resective epilepsy surgery is not associated with C3435T polymorphism in the ABCB1 (MDR1) gene

• Published in: Epilepsy research 2008-07, Vol.80 (1), p.42-46
• Main Authors: Dericioglu, Nese, Babaoglu, Melih O, Yasar, Umit, Bal, I. Burak, Bozkurt, Atila, Saygi, Serap
• Format: Article
• Language: English
• Subjects: ABCB1 (MDR1) gene; Adult; Anticonvulsants. Antiepileptics. Antiparkinson agents; ATP Binding Cassette Transporter, Sub-Family B; ATP-Binding Cassette, Sub-Family B, Member 1 - genetics; Biological and medical sciences; C3435T polymorphism; DNA Mutational Analysis; Drug Resistance, Multiple - genetics; Epilepsy - genetics; Epilepsy - surgery; Female; Gene Frequency; Genotype; Headache. Facial pains. Syncopes. Epilepsia. Intracranial hypertension. Brain oedema. Cerebral palsy; Humans; Male; Medical sciences; Multidrug resistance; Nervous system (semeiology, syndromes); Neurology; Neuropharmacology; Pharmacology. Drug treatments; Polymorphism, Genetic; Refractory epilepsy; Retrospective Studies
• ISSN: 0920-1211; 1872-6844
• DOI: 10.1016/j.eplepsyres.2008.03.004

Summary Purpose The C3435T polymorphism in the gene coding for P-glycoprotein (ABCB1) has been correlated with drug resistance in patients with epilepsy. However, replication studies have revealed conflicting results and the reason for this is not clear. We investigated the frequency of C3435T polymorphism in epileptic Turkish patients who underwent resective epilepsy surgery and compared our results with healthy controls. Methods DNA samples were obtained from 100 healthy controls and 89 consecutive adult patients who underwent resective brain surgery due to refractory seizures at our epilepsy center. Genotypes for the C3435T polymorphism were determined by PCR and restriction analysis. Results Comparison of drug-resistant patients and healthy controls revealed no significant difference in allele frequency (C vs. T; χ2 = 0.015, p = 0.90) and genotype frequency ( χ2 = 2.05, p = 0.36). The findings in the pure hippocampal sclerosis (HS) group ( n = 73) were not significantly different from control subjects, either (allele frequency: χ2 = 0.29, p = 0.59; genotype frequency: χ2 = 2.14, p = 0.34). Conclusions Our findings failed to prove an association between C3435T polymorphism and drug resistance in a sample of Turkish patients with refractory epilepsy who underwent resective brain surgery.