Please cite this article as follows: Kissling C, Retz W, Wiemann S, Coogan AN, Clement RM, Hünnerkopf R, Conner AC, Freitag CM, Rösler M, Thome J. 2008. A Polymorphism at the 3′-Untranslated Region of the CLOCK Gene Is Associated With Adult Attention-Deficit Hyperactivity Disorder. Am J Med Genet Part B 147B: 333–338.
Article first published online: 18 OCT 2007
Copyright © 2007 Wiley-Liss, Inc.
American Journal of Medical Genetics Part B: Neuropsychiatric Genetics
Volume 147B, Issue 3, pages 333–338, 5 April 2008
How to Cite
Kissling, C., Retz, W., Wiemann, S., Coogan, A. N., Clement, R. M., Hünnerkopf, R., Conner, A. C., Freitag, C. M., Rösler, M. and Thome, J. (2008), A polymorphism at the 3′-untranslated region of the CLOCK gene is associated with adult attention-deficit hyperactivity disorder. Am. J. Med. Genet., 147B: 333–338. doi: 10.1002/ajmg.b.30602
Disclosure of Interests: All authors reported no biomedical financial interests or potential conflicts of interests.
- Issue published online: 21 MAR 2008
- Article first published online: 18 OCT 2007
- Manuscript Accepted: 9 JUL 2007
- Manuscript Received: 20 APR 2007
- German Federal Ministry of Education and Research within the NGFN program. Grant Number: 01GR0420
- German Research Council. Grant Number: DFG HU1536/1-1
- adult ADHD;
- CLOCK gene;
- circadian rhythmicity;
- single nucleotide polymorphism
Attention-deficit hyperactivity disorder (ADHD) is frequently found in childhood and persists in about 50% of cases into adulthood. Several studies demonstrate a relationship between ADHD, circadian rhythmicity and sleeping disturbances in unmedicated ADHD patients. Since ADHD is a very complex disease with a high genetic load involving multiple genes of moderate effect, we hypothesized a link between adult ADHD and genes involved in the circadian timekeeping system. A 3′-UTR polymorphism of the circadian locomotor output cycles protein kaput (CLOCK) gene, rs1801260, has been linked to disturbed sleep patterns, although both the C-allele and more controversially the T-allele have been proposed as risk factors for different measures of evening preference. This study compared self-rating and interview based measures of ADHD psychopathology of 143 subjects with and without ADHD with their rs1801260 genotype to test the hypothesis that ADHD is linked to one of the alleles of the CLOCK polymorphism. The T > C single nucleotide polymorphism rs1801260 was genotyped in DNA isolated from blood samples. The associations between genotype and ADHD-scores were compared using non-parametric ANCOVA with post hoc pairwise comparisons. There was a strong, significant association (P < 0.001) between each of the adult ADHD assessments and the rs1801260 polymorphism with at least one T-mutation being the risk allele. This is the first study suggesting that a polymorphism of a gene within the circadian “clock” mechanism is a direct or linked contributing factor in adult ADHD. © 2007 Wiley-Liss, Inc.