REVERSE phenotyping-Can the phenotype following constitutive Tph2 gene inactivation in mice be transferred to children and adolescents with and without adhd?
INTRODUCTION
Experimental models of neuropsychiatric disorders, for example, ADHD, are used to mimic specific phenotypic traits of a complex human disorder. However, it remains unresolved to what extent the animal phenotype reflects the specific human trait. The null mutant mouse of the serotonin-synthesizing tryptophan hydroxylase-2 (Tph2-/- ) gene has been proposed as experimental model for ADHD with high face validity for impulsive, aggressive, and anxious behaviors. To validate this ADHD-like model, we examined the Tph2-/- phenotype in humans when considering allelic variation of TPH2 function ("reverse phenotyping").


METHODS
58 participants (6 females, 8-18 years) were examined, of whom 32 were diagnosed with ADHD. All participants were phenotyped for impulsivity, aggression, and anxiety using questionnaires, behavioral tests, and MRI scanning while performing the 4-choice serial reaction time task. Additionally, participants were genotyped for the TPH2 G-703T (rs4570625) polymorphism. To analyze the relation between TPH2 G-703T variants and the impulsive/aggressive/anxious phenotype, mediation analyses were performed using behavioral and MRI data as potential mediators.


RESULTS
We found that the relation between TPH2 G-703T and aggression as part of the reverse Tph2- /- phenotype was mediated by structure and function of the right middle and inferior frontal gyrus.


CONCLUSION
At the example of trait aggression, our results support the assumption that the Tph2 null mutant mouse reflects the TPH2 G-703T-dependent phenotype in humans. Additionally, we conclude that "reverse phenotyping" is a promising method to validate experimental models and human findings for refined analysis of disease mechanisms.
['Akhrif|Atae|A|', 'Roy|Arunima|A|', 'Peters|Katharina|K|', 'Lesch|Klaus-Peter|KP|', 'Romanos|Marcel|M|', 'Schmitt-Böhrer|Angelika|A|', 'Neufang|Susanne|S|0000-0002-4927-2969']
D000818:Animals D001289:Attention Deficit Disorder with Hyperactivity D020868:Gene Silencing D005838:Genotype D051379:Mice D010641:Phenotype D014365:Tryptophan Hydroxylase
impulsivity aggression anxiety TPH2 G-703T (rs4570625) polymorphism Tph2-/- mouse attention-deficit/hyperactivity disorder (ADHD) tryptophan hydroxylase-2 (TPH2)