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The occurrence of sexual side-effects from antidepressants is thought to be mediated through serotonin 2A (5HT2A) receptors. It is currently unknown if functional polymorphisms in the 5HT2A receptor or its G-protein second messenger complex are related to sexual dysfunction in patients taking an selective serotonin reuptake inhibitor (SSRI) for depression. The purpose of this study was to determine the relationship of the 5HT2A -1438 G/A and GNB3 C825T single nucleotide polymorphisms with overall sexual well-being and individual components of sexual health as measured by the Changes in Sexual Functioning Questionnaire (CSFQ). We evaluated 89 outpatients (18-40 years of age) at low risk for other causes of sexual dysfunction who were being treated for depression with an SSRI and did not have sexual difficulties before taking the antidepressant. Outcome measures were stratified by 5HT2A and GNB3 genotypes. After controlling for age, gender, anxiety scale scores, and depression scale scores, persons with a GG genotype of the 5HT2A -1438 single nucleotide polymorphisms (SNP) were significantly more likely to be categorized as having sexual dysfunction than persons with a GA or AA genotype (OR=3.6; 95% CI 1.03, 12.6; p=0.046). Furthermore, the 5HT2A -1438 GG genotype was a significant predictor of lower arousal scores (p=0.022) after accounting for other measures. There was no significant relationship between any outcome measure and GNB3 genotype.

Serotonin 2A −1438 G/A and G-Protein Beta3 Subunit C825T Polymorphisms in Patients with Depression and SSRI-Associated Sexual Side-Effects