title: Effect of DRD2, 5-HT2A, and COMT genes on antipsychotic response to risperidone.
abstract: Risperidone is a widely used atypical antipsychotic with certain advantages over typical antipsychotics. Although variations in the efficacy of treatment with risperidone have been observed, no specific predictable marker has been identified as of yet. In all, 73 Japanese patients with schizophrenia were given risperidone for 8 weeks, and clinical symptoms were evaluated using the Positive and Negative Syndrome Scale (PANSS). Six candidate polymorphisms (HTR2A -1438G>A, 102T>C, H452Y; DRD2 -141delC, Taq I A; COMT V158M) were genotyped. The diplotype configuration for each individual was estimated by the maximum-likelihood method. Multiple linear regressions were used to analyze the effects of these haplotypes/genotype and other prognostic factors on PANSS scale performance. After adjustment for the effects of patient-related variables, HTR2A diplotype and COMT genotype, as well as other potential prognostic factors, did not significantly influence the clinical performance. A DRD2 haplotype tended to correlate with better clinical performance. Compared with patients who had Ins-A2/Ins-A2 diplotype (n=25), PANSS total scores of patients with Ins-A2/Del-A1 diplotype (n=10) showed 40% greater improvement (P=0.03). The PANSS total scores of patients with HTR2A A-T/A-T diplotype (n=22) tended to show 15% worse improvement compared with A-T/G-C diplotype (n=33) (P=0.06). These results should be treated with caution because of limitations due to small sample size, heterogeneity of patients with respect to past antipsychotic use history, and no correction for multiple corrections. However, the present findings generate important hypotheses in a sample of Japanese schizophrenia patients that may lay the foundation for future pharmacogenomics investigations in other populations.
authors: Department of Psychiatry, Fujita Health University School of Medicine, Aichi, Japan.
authors: Y
authors: Y
authors: Yamanouchi
authors: N
authors: N
authors: Iwata
authors: T
authors: T
authors: Suzuki
authors: T
authors: T
authors: Kitajima
authors: M
authors: M
authors: Ikeda
authors: N
authors: N
authors: Ozaki
mesh_terms: D000328:Adult; D014150:Antipsychotic Agents / Q000494:pharmacology / Q000627:therapeutic use*; D002394:Catechol O-Methyltransferase / Q000235:genetics*; D016009:Chi-Square Distribution; D065127:Dopamine D2 Receptor Antagonists; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic / Q000187:drug effects / Q000235:genetics; D011618:Psychotic Disorders / Q000188:drug therapy / Q000235:genetics; D044402:Receptor, Serotonin, 5-HT2A / Q000235:genetics* / Q000502:physiology; D017448:Receptors, Dopamine D2 / Q000235:genetics* / Q000502:physiology; D018967:Risperidone / Q000494:pharmacology / Q000627:therapeutic use*; D012559:Schizophrenia / Q000188:drug therapy / Q000235:genetics; D058830:Serotonin 5-HT2 Receptor Antagonists; D018709:Statistics, Nonparametric
chemical_list: D014150:Antipsychotic Agents; D065127:Dopamine D2 Receptor Antagonists; D044402:Receptor, Serotonin, 5-HT2A; D017448:Receptors, Dopamine D2; D058830:Serotonin 5-HT2 Receptor Antagonists; D002394:Catechol O-Methyltransferase; D018967:Risperidone