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Related Experiment Video

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Converging evidence does not support GIT1 as an ADHD risk gene.

Marieke Klein1, Monique van der Voet1, Benjamin Harich1

  • 1Department of Human Genetics, Radboud University Medical Center, Donders Institute for Brain, Cognition and Behaviour, Nijmegen, The Netherlands.

American Journal of Medical Genetics. Part B, Neuropsychiatric Genetics : the Official Publication of the International Society of Psychiatric Genetics
|June 11, 2015
PubMed
Summary

This study investigated the G protein-coupled receptor kinase interacting ArfGAP 1 (GIT1) gene

Keywords:
ADHDDrosophila melanogasterGIT1brain imaging geneticseQTL

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Area of Science:

  • Neurogenetics
  • Molecular Psychiatry

Background:

  • Attention-Deficit/Hyperactivity Disorder (ADHD) is a prevalent neuropsychiatric disorder with a complex genetic etiology.
  • Previous research suggested a potential association between the GIT1 gene and ADHD.
  • The role of GIT1 in cognitive and brain phenotypes related to ADHD requires further investigation.

Purpose of the Study:

  • To replicate the association between the GIT1 gene and ADHD.
  • To examine the influence of GIT1 on cognitive and brain characteristics.
  • To explore the functional impact of a specific GIT1 variant (rs550818) on gene expression and neuronal function.

Main Methods:

  • Gene-wide and single variant association analyses of GIT1 were conducted across three large cohorts (PGC, IMpACT-NL, BIG).
  • Expression quantitative trait locus (eQTL) analysis was performed for the rs550818 variant in human blood.
  • Drosophila melanogaster was used as a model to study the effects of Git knockdown on neuronal morphology and behavior.

Main Results:

  • No significant association was found between GIT1 variants and ADHD in any of the investigated cohorts.
  • The rs550818 risk-genotype was confirmed to reduce GIT1 expression levels.
  • Git knockdown in Drosophila resulted in abnormal synapse and dendrite morphology but did not impact locomotor activity.

Conclusions:

  • The GIT1 gene is not confirmed as a candidate gene for ADHD.
  • While rs550818 influences GIT1 expression and neuronal morphology, these changes do not appear to have direct behavioral consequences relevant to ADHD.
  • Further research is needed to elucidate the genetic underpinnings of ADHD.