Tryptophan hydroxylase 2 gene is associated with major depression and antidepressant treatment response.

Abstract:

:Tryptophan hydroxylase-2 (TPH2) is the rate-limiting biosynthetic isoenzyme for serotonin that is preferentially expressed in the brain and has been implicated in the pathogenesis of major depressive disorder (MDD) and in the mechanism of antidepressant action. This study aimed to investigate whether common genetic variation in the TPH2 gene is associated with MDD and therapeutic response to antidepressants in a Chinese population. A total of 508 MDD patients and 463 unrelated controls were recruited. Among the MDD patients, 187 accepted selective serotonin reuptake inhibitor (fluoxetine or citalopram) antidepressant treatment for 8 weeks with therapeutic evaluation before and after treatment. Five TPH2 polymorphisms were genotyped and their association with MDD or treatment response was assessed by haplotype and single-marker analysis. In single-marker-based analysis, the rs17110747-G homozygote polymorphism was found to be more frequent in the MDD patients than in the controls (P=0.002). Genotype analysis in responders (defined as those with a 50% reduction in baseline Hamilton score) and non-responders after 8 weeks of antidepressant treatment showed that the proportion of rs2171363 heterozygote carriers was higher in the responders than the non-responders (P=0.009). No significant association with MDD or antidepressant therapeutic response was discovered in haplotype analyses. Our findings show that TPH2 genetic variants may play a role in MDD susceptibility and in acute therapeutic response to selective serotonin reuptake inhibitors.

authors

Tsai SJ,Hong CJ,Liou YJ,Yu YW,Chen TJ,Hou SJ,Yen FC

doi

10.1016/j.pnpbp.2009.02.020

subject

Has Abstract

pub_date

2009-06-15 00:00:00

pages

637-41

issue

4

eissn

0278-5846

issn

1878-4216

pii

S0278-5846(09)00062-1

journal_volume

33

pub_type

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