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Eur Neuropsychopharmacol. 2003 Mar;13(2):117-22.

SSRIs antidepressant activity is influenced by G beta 3 variants.

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  • 1Department of Psychiatry, Vita-Salute University, Fondazione Centro San Raffaele del Monte Tabor, Milan, Italy.


The aim of the present study was to test a possible effect of the G-protein beta3-subunit (Gbeta3) C825T gene variant on the antidepressant activity of selective serotonin reuptake inhibitors (SSRIs) in a sample of major and bipolar depressives, with or without psychotic features. Four hundred and ninety inpatients were treated with fluvoxamine 300 mg/day (n=362) or paroxetine 40 mg/day (n=128) and either placebo or pindolol in a double-blind design for 6 weeks. The severity of depressive symptoms was weekly assessed with the Hamilton Rating Scale for Depression. Gbeta3 allelic variants were determined in each subject using a PCR-based technique. Subjects with Gbeta3 T/T variants showed better response to treatment (P=0.009) and this effect was independent from analyzed demographic and clinical variables. These results confirm preliminary reports and shed further light on the genetics of the response to antidepressant treatments.

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