title: Genetic susceptibility to tardive dyskinesia in chronic schizophrenia subjects: III. Lack of association of CYP3A4 and CYP2D6 gene polymorphisms.
abstract: Tardive dyskinesia is a severe debilitating movement disorder characterized by choreoathetotic movements developing in one-fifth of the patients with schizophrenia. In this study we have investigated the significance of CYP3A4*1B and CYP2D6*4 polymorphisms in TD susceptibility among chronic schizophrenia patients (n = 335) from north India. Tardive dyskinesia was diagnosed in approximately 29% (96/335) of these patients. No significant association of either of the two SNPs with TD (CYP3A4*1B chi2 = 0. 308, df = 1, p = 0.579; CYP2D6*4 chi2 = 0.006, df = 1, p = 0.935) was observed. However a trend towards increased severity of TD in patients heterozygous for the CYP2D6*4 mutation was observed.
authors.affiliation: Department of Genetics, University of Delhi South Campus, New Delhi 110021, India.
authors.forename: Arun K
authors.initials: AK
authors.lastname: Tiwari
authors.forename: Smita N
authors.initials: SN
authors.lastname: Deshpande
authors.forename: A R
authors.initials: AR
authors.lastname: Rao
authors.forename: Triptish
authors.initials: T
authors.lastname: Bhatia
authors.forename: Bernard
authors.initials: B
authors.lastname: Lerer
authors.forename: Vishwajit L
authors.initials: VL
authors.lastname: Nimgaonkar
authors.forename: B K
authors.initials: BK
authors.lastname: Thelma
mesh_terms: D000704:Analysis of Variance; D014150:Antipsychotic Agents / Q000009:adverse effects; D044466:Asian People / Q000235:genetics; D016022:Case-Control Studies; D003430:Cross-Sectional Studies; D019389:Cytochrome P-450 CYP2D6 / Q000235:genetics*; D051544:Cytochrome P-450 CYP3A; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics*; D004409:Dyskinesia, Drug-Induced / Q000208:ethnology / Q000235:genetics*; D020022:Genetic Predisposition to Disease / Q000208:ethnology / Q000235:genetics*; D006801:Humans; D007194:India / Q000453:epidemiology; D010597:Pharmacogenetics; D020641:Polymorphism, Single Nucleotide; D012189:Retrospective Studies; D012559:Schizophrenia / Q000188:drug therapy
chemical_list: D014150:Antipsychotic Agents; D003577:Cytochrome P-450 Enzyme System; C104464:CYP3A protein, human; D019389:Cytochrome P-450 CYP2D6; D051544:Cytochrome P-450 CYP3A; C510163:CYP3A4 protein, human