title: Differential role of sodium channels SCN1A and SCN2A gene polymorphisms with epilepsy and multiple drug resistance in the north Indian population.
abstract: OBJECTIVE
  To evaluate sodium channel genes as candidates for epilepsy susceptibility and their role in therapeutic efficacy, we screened coding single-nucleotide polymorphism of SCN1A p. Thr 1067 Ala or c.3184 A-->G (rs2298771) and SCN2A p.Arg19Lys or c.56 G-->A (rs17183814) in north Indian epilepsy patients.
  
  
  METHODS
  The genotyping was performed in 160 control subjects and 336 patients with epilepsy, of whom 117 were drug resistant and 219 were drug responsive. Therapeutic drug monitoring for phenytoin, carbamazepine, phenobarbital and valproate was also performed in 20% of the patients to confirm compliance.
  
  
  RESULTS
  AG genotype of SCN1A 3184 A-->G polymorphism was significantly higher and associated in epilepsy patients [P= 0.005; odds ratio (OR) 1.76, 95% confidence interval (CI) 1.19, 2.61], whereas A variant of SCN2A c.56 G-->A was associated with multiple drug resistance in north Indian patients with epilepsy (P= 0.03; OR 1.62, 95% CI 1.03, 2.56).
  
  
  CONCLUSIONS
  Overall, results indicate a differential role of genetic polymorphisms of sodium channels SCN1A and SCN2A in epilepsy susceptibility and drug response.
authors.affiliation: Departments of Genetics and Neurology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow 226014, India.
authors.forename: Ram
authors.initials: R
authors.lastname: Lakhan
authors.forename: Ritu
authors.initials: R
authors.lastname: Kumari
authors.forename: Usha K
authors.initials: UK
authors.lastname: Misra
authors.forename: Jayanti
authors.initials: J
authors.lastname: Kalita
authors.forename: Sunil
authors.initials: S
authors.lastname: Pradhan
authors.forename: Balraj
authors.initials: B
authors.lastname: Mittal
mesh_terms: D044466:Asian People; D018432:Drug Resistance, Multiple / Q000187:drug effects / Q000235:genetics*; D004827:Epilepsy / Q000188:drug therapy / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease / Q000235:genetics; D014644:Genetic Variation; D005838:Genotype; D006801:Humans; D008297:Male; D010641:Phenotype; D011110:Polymorphism, Genetic; D012016:Reference Values; D015222:Sodium Channels / Q000187:drug effects / Q000235:genetics*; D055815:Young Adult
chemical_list: D015222:Sodium Channels
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