Fageera W, Sengupta SM, Fortier MÈ, Grizenko N, Babienco S, Labbe A, Joober R. Sex-dependent complex association of TPH2 with multiple dimensions of ADHD.
Prog Neuropsychopharmacol Biol Psychiatry 2021;
110:110296. [PMID:
33677046 DOI:
10.1016/j.pnpbp.2021.110296]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Revised: 02/18/2021] [Accepted: 02/23/2021] [Indexed: 01/07/2023]
Abstract
BACKGROUND
Tryptophan hydroxylase 2 (TPH2) is a key enzyme in the biosynthesis of serotonin in the brain. This study aims to investigate the role of a functional variant in TPH2 (rs17110747) in the pathophysiology of ADHD. This variant has been implicated in mood disorders in recent meta-analysis. This study uses a comprehensive approach that combines association testing and pharmaco-dynamic evaluation of behaviour, in a large sample of children with ADHD (n = 570).
METHODS
The association between various ADHD relevant traits and rs17110747 was analyzed using family-based association tests (FBAT). Children were assessed by parents, teachers and research staff under three experimental conditions (EC): baseline, placebo, and methylphenidate using a double-blind placebo-controlled crossover trial.
OUTCOMES
FBAT analysis conducted in a sample stratified based on sex of the proband, showed that there was a highly significant overtransmission of the G allele from parents to affected girls. In addition, significant association with several behavioral and cognitive dimensions of ADHD was observed only when the proband was female. Further, girls with the G/G genotype (rs17110747) had greater response to placebo when evaluated by parents.
INTERPRETATION
These results suggest that there may be a complex association of TPH2 in the etiology of ADHD, with a sex-specific effect.
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