title: Serotonin transporter gene polymorphism and treatment response to serotonin reuptake inhibitor (escitalopram) in depression: An open pilot study.
abstract: BACKGROUND
  Blocking of the serotonin transporter is the main mechanism of action of SSRIs; therefore, the gene encoding this protein is a strong candidate for a possible genetic influence on the treatment response.
  
  
  OBJECTIVE
  To evaluate relationship between serotonin transporter gene promoter region polymorphism and the efficacy of SSRI (escitalopram) treatment in depression.
  
  
  METHODS
  Fifty-seven consecutive patients with unipolar depressive episode (DSM IV criteria) were genotyped for the SERT gene polymorphism and treated with escitalopram 20 mg/day. Weekly assessment (HAM-D-21) was made for treatment response up to 6 weeks.
  
  
  RESULTS
  Significant (P > 0.0001) difference between groups (ll vs. ss or ls) in response to treatment by escitalopram was revealed by our study. However, no difference with respect to age, gender, or onset of illness was observed between genotype subgroups.
  
  
  CONCLUSIONS
  The study suggests that serotonin transporter gene polymorphism may have an influence on the effectiveness of SSRI treatment in depressive disorders, irrespective of clinical variables. Further controlled studies are required to validate these results.
authors.affiliation: Department of Psychiatry, Govt. Medical College, Srinagar, Kashmir, India.
authors.forename: Mushtaq A
authors.initials: MA
authors.lastname: Margoob
authors.forename: Dhuha
authors.initials: D
authors.lastname: Mushtaq
authors.forename: Imtiyaz
authors.initials: I
authors.lastname: Murtza
authors.forename: Huda
authors.initials: H
authors.lastname: Mushtaq
authors.forename: Arif
authors.initials: A
authors.lastname: Ali