Experimental Brain Research

, Volume 163, Issue 3, pp 352–360 | Cite as

The methionine allele of the COMT polymorphism impairs prefrontal cognition in children and adolescents with ADHD

  • Mark A. Bellgrove
  • Katharina Domschke
  • Ziarih Hawi
  • Aiveen Kirley
  • Celine Mullins
  • Ian H. Robertson
  • Michael Gill
Research Article


ADHD is a highly heritable psychiatric disorder of childhood. A functional polymorphism (Val158Met) of the catechol-O-methyltransferase (COMT) gene has attracted interest as a candidate gene for ADHD. The high-activity valine variant of this polymorphism degrades prefrontal dopamine three to four times more quickly than the low-activity methionine variant and could therefore contribute to the proposed hypodopaminergic state in ADHD. Here we tested for association of this polymorphism with ADHD and examined its influence on prefrontal cognition in ADHD. We have previously reported no association of the Val158Met COMT gene polymorphism in 94 Irish ADHD families (Hawi et al. (2000) Am J Med Genet 96:282–284). Here we re-examined this finding with an extended sample of 179 ADHD cases using a family control design. We also examined the performance of children and adolescents with ADHD (n=61) on a standardised test of sustained attention. Analysis confirmed the absence of an association between the Val158Met COMT gene polymorphism and the clinical phenotype of ADHD. COMT genotype, however, affected prefrontal cognition in ADHD: ADHD children who were homozygous for the valine variant had significantly better sustained attention than those ADHD children possessing at least one copy of the methionine variant. Children possessing the methionine variant performed significantly below age-related norms on tests of sustained attention. Contrary to expectations, the methionine variant of the Val158Met COMT gene polymorphism impaired prefrontally-mediated cognition in ADHD. This effect may be understood by positing a hyper-functioning of prefrontal dopaminergic systems. Against this background, the slower clearance of dopamine associated with the methionine variant of the COMT gene polymorphism may be disadvantageous to cognition in ADHD.


ADHD COMT Dopamine Attention Genetics 


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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Mark A. Bellgrove
    • 1
    • 2
  • Katharina Domschke
    • 2
  • Ziarih Hawi
    • 2
  • Aiveen Kirley
    • 2
  • Celine Mullins
    • 1
    • 2
  • Ian H. Robertson
    • 1
  • Michael Gill
    • 2
  1. 1.Department of Psychology and Trinity College Institute of NeuroscienceTrinity College DublinDublinIreland
  2. 2.Departments of Psychiatry and Genetics and Trinity College Institute of NeuroscienceTrinity College DublinDublinIreland

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