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  • Title: Multidrug resistance 1 (MDR1) 3435C/T genotyping in childhood drug-resistant epilepsy.
    Author: Saygi S, Alehan F, Atac FB, Erol I, Verdi H, Erdem R.
    Journal: Brain Dev; 2014 Feb; 36(2):137-42. PubMed ID: 23465586.
    Abstract:
    INTRODUCTION: A mutation at nucleotide position 3435 in exon 26 of the multidrug resistance 1 (MDR1) gene is the most frequently studied polymorphism in relation to multidrug resistance. However, there are conflicting data as to whether the CC or TT genotype of the 3435C>T polymorphism is associated with drug resistance. METHODS AND RESULTS: We investigated the association between this polymorphism in drug-resistant childhood epilepsy by comparison with drug-responsive patients. In total, 59 patients with drug-resistant epilepsy, defined as having four or more seizures within a 12-month period while using three or more AEDs, 60 children with drug-responsive epilepsy who had remained seizure-free for 12months on their current AED regimen and 76 healthy children were involved in this study. Genotype frequencies in drug-resistant patients were as follows: 32.2% CC, 44.1% CT, 23.7% TT; in the drug-responsive group: 20.0% CC, 50.0% CT, 30.0% TT; in the control group: 24.3% CC, 50.0% CT, 25.7% TT. Comparison of drug-resistant and drug-responsive patients revealed no significant difference in genotype frequency. The findings of the epilepsy patients were not significantly different from those of the healthy control subjects. CONCLUSIONS: Our study does not support any significant association between the MDR1 polymorphism and drug-resistant childhood epilepsy.
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