title: Relationship between three serotonin receptor subtypes (HTR3A, HTR2A and HTR4) and treatment-resistant schizophrenia in the Japanese population.
abstract: The proportion of treatment-resistant schizophrenia (TRS) has been estimated as 20-40% in the schizophrenic patients. Genetic factors are considered to be involved in the development of this condition. Serotonin subtypes are hypothesized to be the candidate genes. In the present study, single marker and haplotype analyses between several mutations of serotonin receptor subtypes (HTR2A, HTR3A and HTR4) and TRS (TRS=101, NON-TRS=239) were performed to determine a possible relationship with the development of TRS. Additionally, we also compared the daily neuroleptic dosage among each genotype. No significant association was observed between TRS and each allele, genotype, and haplotype. However, the daily neuroleptic dosage that patients had been receiving during their maintenance therapy was significantly higher in patients with the T/T genotype of HTR3A polymorphism (rs1062613, p=0.041). The present results support further research to examine the relationship between HTR3A polymorphism and the development of TRS in the Japanese population.
authors: Department of Psychiatry, Nagoya University Graduate School of Medicine, Nagoya, Japan. xiaofei@med.nagoya-u.ac.jp
authors: Xiaofei
authors: X
authors: Ji
authors: Nagahide
authors: N
authors: Takahashi
authors: Shinichi
authors: S
authors: Saito
authors: Ryoko
authors: R
authors: Ishihara
authors: Nobuhisa
authors: N
authors: Maeno
authors: Toshiya
authors: T
authors: Inada
authors: Norio
authors: N
authors: Ozaki
mesh_terms: D000328:Adult; D000368:Aged; D014150:Antipsychotic Agents / Q000627:therapeutic use; D004252:DNA Mutational Analysis; D004351:Drug Resistance / Q000235:genetics; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D007564:Japan / Q000208:ethnology; D015810:Linkage Disequilibrium; D008297:Male; D008875:Middle Aged; D009154:Mutation; D010597:Pharmacogenetics; D044402:Receptor, Serotonin, 5-HT2A / Q000235:genetics*; D011985:Receptors, Serotonin / Q000235:genetics*; D044406:Receptors, Serotonin, 5-HT3; D044422:Receptors, Serotonin, 5-HT4 / Q000235:genetics*; D012559:Schizophrenia / Q000188:drug therapy / Q000453:epidemiology / Q000235:genetics*
chemical_list: D014150:Antipsychotic Agents; C509409:HTR3A protein, human; D044402:Receptor, Serotonin, 5-HT2A; D011985:Receptors, Serotonin; D044406:Receptors, Serotonin, 5-HT3; D044422:Receptors, Serotonin, 5-HT4