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Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterized by persistent inattention, hyperactivity, and impulsivity. It affects approximately 5-8% of children globally, with around 60-70% of cases persisting into adulthood. ADHD has significant implications for educational attainment, social interactions, and occupational success.
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Human genetics provides a profound framework for understanding the interplay between genetic predispositions and human psychology. At the heart of this discipline lies the study of how genes influence physical traits, behaviors, and susceptibility to diseases. Each person carries a unique genetic code that subtly or significantly shapes their psychological and behavioral landscape.
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Related Experiment Video

Updated: Dec 25, 2025

Using Brain Activation nir-HEG/Q-EEG and Execution Measures CPTs in a ADHD Assessment Protocol
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ADHD and depression: investigating a causal explanation.

Lucy Riglin1, Beate Leppert2, Christina Dardani2,3

  • 1Division of Psychological Medicine and Clinical Neurosciences, MRC Centre for Neuropsychiatric Genetics and Genomics, Cardiff University, Cardiff, UK.

Psychological Medicine
|April 7, 2020
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Summary

Attention-deficit hyperactivity disorder (ADHD) increases the risk of developing depression later in life. Genetic liability for ADHD also appears to causally influence major depression, suggesting a significant link between these conditions.

Keywords:
ADHDALSPACMendelian randomizationcausaldepressionlongitudinal

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Area of Science:

  • Psychiatry
  • Genetics
  • Epidemiology

Background:

  • Attention-deficit hyperactivity disorder (ADHD) is frequently comorbid with depression.
  • A significant genetic overlap exists between ADHD and depression.
  • The causal relationship between ADHD and depression requires further investigation.

Purpose of the Study:

  • To investigate the causal relationship between childhood ADHD and young-adult depression.
  • To examine the causal effect of ADHD genetic liability on depression using Mendelian randomization.

Main Methods:

  • A longitudinal population cohort study (ALSPAC, N=8310) assessed childhood ADHD and young-adult recurrent depression.
  • Two-sample Mendelian randomization analyses utilized Genome-Wide Association Study (GWAS) data for ADHD and depression genetic liability.

Main Results:

  • Childhood ADHD was associated with an increased risk of recurrent depression in young adulthood (OR 1.35).
  • Mendelian randomization analyses indicated a causal effect of ADHD genetic liability on major depression (OR 1.21).
  • The association with a broader depression definition was weaker (OR 1.07).

Conclusions:

  • ADHD is a risk factor for developing depression later in life.
  • Evidence supports a causal role of ADHD genetic liability in major depression.
  • The relationship differs based on the definition of depression used.