Journal of Abnormal Child Psychology

, Volume 35, Issue 6, pp 999–1008 | Cite as

Genetic Support for the Dual Nature of Attention Deficit Hyperactivity Disorder: Substantial Genetic Overlap Between the Inattentive and Hyperactive–impulsive Components

  • Gráinne McLoughlin
  • Angelica Ronald
  • Jonna Kuntsi
  • Philip Asherson
  • Robert Plomin
Article

Abstract

Objective

Attention deficit hyperactivity disorder (ADHD) is a common, complex and highly heritable disorder, characterised by inattentive, impulsive and overactive behaviour. Evidence for the heritability of ADHD measures in twin population samples has come from the analysis of total scores that combine inattentive and hyperactive–impulsive symptoms subscales. This study investigated, in a community sample, the aetiology of ADHD-like traits and the aetiological overlap between the two dimensions that define the ADHD disorder.

Materials and Methods

Parents of 6,222 approximately 8-year-old twin pairs from the Twins Early Development Study (TEDS) population sample completed the two subscales of the Conners’ 18-item DSMIV checklist, a screening instrument for ADHD symptoms.

Results

Both subscales were highly heritable (hyperactive–impulsive: 88%; inattentive: 79%). Bivariate genetic modelling indicated substantial genetic overlap between the two components; however, there were significant independent genetic effects.

Conclusions

These findings suggest that many genes associated with the hyperactivity–impulsivity dimension will also be associated with the inattentive dimension but that there is significant genetic heterogeneity as well. These results provide genetic support for combining the two behavioural dimensions that define ADHD, but also suggest that some symptom-specific genes will also be identified.

Keywords

Twin study Genetics Attention deficit hyperactivity disorder 

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Gráinne McLoughlin
    • 1
  • Angelica Ronald
    • 1
  • Jonna Kuntsi
    • 1
  • Philip Asherson
    • 1
  • Robert Plomin
    • 1
  1. 1.MRC Social, Genetic and Developmental Psychiatry Centre, Institute of PsychiatryKing’s College LondonLondonUK

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