title: Clozapine response and the 5HT2C Cys23Ser polymorphism.
abstract: The presence of the 5HT2C receptor allele, Ser23, has recently been reported to predict favorable response to the antipsychotic drug, clozapine. This finding is of interest as Ser23, compared with the more abundant Cys23, alters pharmacological characteristics of the receptor and therefore may provide insights into the mechanism of action of antipsychotic drugs. We determined 5HT2C receptor genotype at the Cys23Ser locus in 66 subjects participating in double-blind studies of clozapine. There was no relationship between Ser23 and clozapine response (p = 0.30, Fisher's exact) nor was there any effect of Ser23 upon absolute levels of psychiatric symptoms after 10 weeks of clozapine treatment (t = -0.57, p = 0.57). These data suggest that this 5HT2C receptor polymorphism is not associated with clozapine response.
authors.affiliation: Experimental Therapeutics Branch, National Institute of Mental Health, National Institutes of Health, Bethesda, MD 20892, USA.
authors.forename: A K
authors.initials: AK
authors.lastname: Malhotra
authors.forename: D
authors.initials: D
authors.lastname: Goldman
authors.forename: N
authors.initials: N
authors.lastname: Ozaki
authors.forename: W
authors.initials: W
authors.lastname: Rooney
authors.forename: A
authors.initials: A
authors.lastname: Clifton
authors.forename: R W
authors.initials: RW
authors.lastname: Buchanan
authors.forename: A
authors.initials: A
authors.lastname: Breier
authors.forename: D
authors.initials: D
authors.lastname: Pickar
mesh_terms: D000483:Alleles; D014150:Antipsychotic Agents / Q000627:therapeutic use*; D001483:Base Sequence; D003024:Clozapine / Q000627:therapeutic use*; D003545:Cysteine; D017931:DNA Primers; D005260:Female; D006580:Genetic Carrier Screening; D006720:Homozygote; D006801:Humans; D008297:Male; D016133:Polymerase Chain Reaction / Q000379:methods; D012150:Polymorphism, Restriction Fragment Length; D011237:Predictive Value of Tests; D011618:Psychotic Disorders / Q000188:drug therapy / Q000235:genetics*; D044405:Receptor, Serotonin, 5-HT2C; D011985:Receptors, Serotonin / Q000235:genetics*; D012559:Schizophrenia / Q000188:drug therapy / Q000235:genetics*; D012694:Serine
chemical_list: D014150:Antipsychotic Agents; D017931:DNA Primers; D044405:Receptor, Serotonin, 5-HT2C; D011985:Receptors, Serotonin; D012694:Serine; D003024:Clozapine; D003545:Cysteine