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Expert Rev Neurother. 2009 Oct;9(10):1547-65. doi: 10.1586/ern.09.78.

The genetics of attention-deficit/hyperactivity disorder.

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1
Centre for Neuroscience, Division of Medical Sciences, University of Dundee, Centre for Child Health, 19 Dudhope Terrace, Dundee, DD3 6HH, UK. d.r.coghill@dundee.ac.uk

Abstract

Attention-deficit/hyperactivity disorder (ADHD) is a complex neurodevelopmental disorder that almost certainly represents the common outcome of multiple causal pathways and it is now generally accepted that genetic factors make a significant contribution to these pathways. Behavioral studies suggest a heritability of approximately 0.76. While molecular genetic approaches have identified a range of potential candidate genes, it is now clear that the genetics of ADHD are characterized by a number of genes each of which makes a small but significant contribution to the overall risk. Several genome-wide linkage studies have been conducted and, although there are considerable differences in findings between studies, several regions have been supported across several studies (bin 16.4, 5p13, 11q22-25, 17p11). The contribution of several candidate genes has been supported by meta-analyses (DRD4, DRD5, DAT1, HTR1B and SNAP25). Genome-wide association scans are starting to appear but have not yet had sufficient power to produce conclusive results. Gene-environment interactions, which are as yet relatively understudied, are likely to be of importance in fully understanding the role of genes in ADHD and will be discussed.

PMID:
19831843
DOI:
10.1586/ern.09.78
[Indexed for MEDLINE]
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