Abstract
Selective serotonin reuptake inhibitors (SSRIs) are used to treat a number of psychiatric disorders related to mood and anxiety, and variations in the serotonin transporter (5-HTT) gene may be involved in a number of these. A polymorphic site in the promoter region is associated with differences in 5-HTT gene expression. Studies suggest that the short allele of the 5-HTT promoter (5-HTTPR) site can adversely influence the antidepressant response to SSRIs, and is associated with anxiety-related traits, depression, and impulsive disorders such as alcohol abuse. Several studies do not replicate these findings; potential confounding factors include age, gender, and population stratification. Other 5-HTT polymorphisms also exist. For example, individuals with the short allele of a variable number of tandem repeats (VNTR) polymorphism, located in the second intron, may have reduced responsiveness to SSRIs, and the STin2.12 allele at this site has been associated with bipolar disorder. Findings both supporting and inconsistent with these conclusions are reviewed. The clinical effects of the polymorphisms may be associated with effects on platelets, neural 5-HTT levels, and indices of serotonergic function.
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This work was supported in part by the National Institute of Mental Health (MH01509, MH59666, MH52247, and MH30915)
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Lotrich, F.E., Pollock, B.G. & Ferrell, R.E. Polymorphism of the Serotonin Transporter. Am J Pharmacogenomics 1, 153–164 (2001). https://doi.org/10.2165/00129785-200101030-00001
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DOI: https://doi.org/10.2165/00129785-200101030-00001