Rationale: A common polymorphism (5HTTLPR) within the promoter region of the serotonin transporter gene (LSC6A4) has been shown to influence response time as well as overall response to selective serotonin reuptake inhibitors (SSRIs) in subjects with major depressive disorder. We hypothesized that a similar effect in response time to sertraline would be observed and that no effect on response time would be seen in a placebo arm.
Objectives: We tested the hypothesis that subjects homozygous for the long allele at the 5HTTLPR polymorphism would respond more rapidly to sertraline than subjects carrying one or two copies of the short allele.