In this study, we estimated the contribution of SLC6A4 (5HTT), HTR1A, HTR2A, HTR1B, SLC6A3 (DAT1), DRD4, DRD2, COMT, and BDNF genes to the suicidal behavior and severity of symptoms of depression and anxiety in the East-Slavic population of Russia. The gene discussed is DRD2; the disease is major depressive disorder.