Abstract
Twin studies have provided evidence for shared genetic influences between attention-deficit/hyperactivity disorder (ADHD) and specific reading disabilities (RD), with this overlap being highest for the inattentive symptom dimension of ADHD. Previously, we found evidence for association of the dopamine receptor D1 gene (DRD1) with ADHD, and with the inattentive symptom dimension in particular. This, combined with evidence for working memory (WM) deficits in individuals with RD or ADHD, and the importance of D1 receptors in attentional processes and WM function, suggests that DRD1 may be a common genetic influence underlying both disorders. Here, in a study of 232 families ascertained through probands with reading problems, we tested for association of the DRD1 gene with RD, as a categorical trait, and with quantitative measures of key reading component skills, WM ability, and inattentive symptoms. Although no associations were found with RD, or with reading component skills or verbal WM, we found evidence for association with inattentive behaviour. Specifically, DRD1 Haplotype 3, the haplotype previously found to be associated with inattentive symptoms in ADHD, is also associated with parent- and teacher-reported symptoms of inattention in this sample selected for reading problems (P=0.023 and 0.004, respectively). Together, the replicated finding of Haplotype 3 association with inattentive symptoms in two independent study samples strongly supports a role for DRD1 in attentional ability. Furthermore, the association of DRD1 with inattention, but not with RD, or the other reading and reading-related phenotypes analysed, suggests that DRD1 contributes uniquely to inattention, without overlap for reading ability.
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Acknowledgements
This work was supported by Postdoctoral Fellowships from the Hospital for Sick Children Research Training Centre (NL and VLM), the Ontario Mental Health Foundation (VLM) and Canadian Institutes of Health Research (NL), and by a Grant (MOP-36358) from the Canadian Institutes of Health Research (CLB).
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Luca, P., Laurin, N., Misener, V. et al. Association of the dopamine receptor D1 gene, DRD1, with inattention symptoms in families selected for reading problems. Mol Psychiatry 12, 776–785 (2007). https://doi.org/10.1038/sj.mp.4001972
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DOI: https://doi.org/10.1038/sj.mp.4001972
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