Objective: Antidepressant-induced mania (AIM) has been associated with the serotonin-transporter-linked promoter region (5-HTTLPR) polymorphism in some studies but not in others. We conducted a meta-analysis of those studies and other studies of genetic predictors of AIM.
Methods: MEDLINE-based searches of genetic studies of AIM were conducted, and a meta-analysis of six studies of 5-HTTLPR was performed. Other polymorphisms were insufficiently studied to allow for meta-analysis.
Results: There was an association of the short (s) variant of 5-HTTLPR and AIM [risk ratio (RR) = 1.35, 95% confidence interval (CI): 1.04-1.76, p=0.02]. There was a higher frequency of s carriers (sl and ss genotypes) in those who developed AIM [RR = 1.38, 95% CI: 0.98-1.93), p=0.06].
Conclusion: The 5-HTTLPR polymorphism appears to have a moderate effect size association with AIM in patients with bipolar disorder.
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