title: Association between the tryptophan hydroxylase-1 gene A218C polymorphism and citalopram antidepressant response in a Korean population.
abstract: Tryptophan hydroxylase-1 (TPH1) is the rate-limiting enzyme in serotonin biosynthesis, and selective serotonin reuptake inhibitors (SSRIs) exert their activity enhancing the general serotonergic tone. Citalopram is the most selective SSRI, with little or no affinity for a variety of receptor types. The goal of this study was to investigate whether the A218C polymorphism of the TPH1 gene is associated with the citalopram antidepressant response in subjects with major depressive disorder (MDD). All of the patients were evaluated using the 21-item Hamilton Depression Rating Scale before beginning and after 8 weeks of citalopram treatment. Genotyping was performed with the polymerase chain reaction. The remission rate to citalopram treatment was worse in MDD subjects with the TPH1 A/A and A/C genotypes than in those with the TPH1 C/C genotype. Our results suggest that the A218C polymorphism of the TPH1 gene serves as a modulator of antidepressant activity, especially in terms of treatment remission.
authors.affiliation: Department of Psychiatry, Hangang Sacred Heart Hospital, Hallym University Medical Center, Korea.
authors.forename: Byung-Joo
authors.initials: BJ
authors.lastname: Ham
authors.forename: Boung-Chul
authors.initials: BC
authors.lastname: Lee
authors.forename: Jong-Woo
authors.initials: JW
authors.lastname: Paik
authors.forename: Rhee-Hun
authors.initials: RH
authors.lastname: Kang
authors.forename: Myoung-Jin
authors.initials: MJ
authors.lastname: Choi
authors.forename: Ihn-Geun
authors.initials: IG
authors.lastname: Choi
authors.forename: Min-Soo
authors.initials: MS
authors.lastname: Lee
mesh_terms: D000328:Adult; D000483:Alleles; D000928:Antidepressive Agents / Q000627:therapeutic use*; D015283:Citalopram / Q000627:therapeutic use*; D004247:DNA / Q000235:genetics; D003866:Depressive Disorder / Q000188:drug therapy* / Q000235:genetics*; D005260:Female; D005838:Genotype; D006801:Humans; D007723:Korea / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic / Q000235:genetics; D011569:Psychiatric Status Rating Scales; D044402:Receptor, Serotonin, 5-HT2A / Q000235:genetics; D016896:Treatment Outcome; D014365:Tryptophan Hydroxylase / Q000235:genetics*
chemical_list: D000928:Antidepressive Agents; D044402:Receptor, Serotonin, 5-HT2A; D015283:Citalopram; D004247:DNA; C497467:TPH1 protein, human; D014365:Tryptophan Hydroxylase