['The pathophysiology of tardive dyskinesia (TD) is not completely understood.Aim. - To assess the relationship of TD with 5-HT2A receptor gene, serotonin transporter gene (5 HTT), and catechol-o-methyltransferase (COMT) gene polymorphisms.', 'Our study comprised 111 unrelated subjects who strictly met DSM-IV criteria for schizophrenia and 32 TD, and 79 healthy unrelated controls; all the subjects were of Turkish origin. The analyses of 5-HT2A receptor gene, 5 HTT gene, and COMT gene polymorphisms were performed using polymerase chain reaction (PCR) technique.', 'The polymorphisms of these genes were not significantly different between the schizophrenic patients, TD and control subjects.'] Is tardive dyskinesia associated with the polymorphisms of 5-HT2A receptor gene , serotonin transporter gene and catechol-o-methyltransferase gene?