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Related Experiment Videos

Does the definition of ADHD affect heritability?

A Thapar1, R Harrington, K Ross

  • 1Department of Psychological Medicine, University of Wales College of Medicine, Cardiff, UK. Thapar@cardiff.ac.uk

Journal of the American Academy of Child and Adolescent Psychiatry
|December 29, 2000
PubMed
Summary

Attention-deficit hyperactivity disorder (ADHD) behaviors are highly heritable, with shared environmental factors influencing teacher-rated symptoms. A common genetic factor impacts both parent and teacher ratings of ADHD.

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Area of Science:

  • Behavioral Genetics
  • Psychiatry
  • Developmental Psychology

Background:

  • Attention-deficit hyperactivity disorder (ADHD) is a complex neurodevelopmental disorder.
  • Understanding the genetic and environmental influences on ADHD is crucial for effective intervention.
  • Twin studies are a powerful tool for dissecting genetic and environmental contributions to complex traits.

Purpose of the Study:

  • To investigate the genetic validity of attention-deficit hyperactivity disorder (ADHD)-related phenotypes using a twin study design.
  • To determine the heritability and environmental influences on parent- and teacher-rated ADHD symptoms.

Main Methods:

  • A twin study design involving 2,846 school-aged twins.
  • Administration of ADHD symptom questionnaires to families.

Related Experiment Videos

  • Collection of parent-rated (2,082 pairs) and teacher-rated (1,470 pairs) ADHD symptom data.

    • Main Results:

    • Broadly defined parent-rated, teacher-rated, and pervasive ADHD categories demonstrated high heritability.
    • Significant shared environmental effects were identified for teacher-rated ADHD.
    • A common genetic factor influenced both parent- and teacher-rated ADHD, with additional genetic and environmental influences for teacher-rated ADHD.

    Conclusions:

    • Pervasive ADHD, defined by both parent and teacher reports, is highly heritable.
    • A shared genetic factor influences parent- and teacher-rated ADHD, but does not explain all genetic variance in teacher-rated ADHD.
    • ADHD symptom scores are highly heritable, with varying maternal contrast effects across different rating scales.