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High loading of polygenic risk for ADHD in children with comorbid aggression.

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Authors
Hamshere, Marian L
Langley, Kate
Martin, Joanna
Agha, Sharifah Shameem
Stergiakouli, Evangelia
Anney, Richard J L
Buitelaar, Jan
Faraone, Stephen V
Lesch, Klaus-Peter
Neale, Benjamin M
Franke, Barbara
Sonuga-Barke, Edmund
Asherson, Philip
Merwood, Andrew
Kuntsi, Jonna
Medland, Sarah E
Ripke, Stephan
Steinhausen, Hans-Christoph
Freitag, Christine
Reif, Andreas
Renner, Tobias J
Romanos, Marcel
Romanos, Jasmin
Warnke, Andreas
Meyer, Jobst
Palmason, Haukur
Vasquez, Alejandro Arias
Lambregts-Rommelse, Nanda
Roeyers, Herbert
Biederman, Joseph
Doyle, Alysa E
Hakonarson, Hakon
Rothenberger, Aribert
Banaschewski, Tobias
Oades, Robert D
McGough, James J
Kent, Lindsey
Williams, Nigel
Owen, Michael J
Holmans, Peter
O'Donovan, Michael C
Thapar, Anita
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Issue Date
2013-08-01

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Citation
Am J Psychiatry 2013, 170 (8):909-16
Abstract
OBJECTIVE Although attention deficit hyperactivity disorder (ADHD) is highly heritable, genome-wide association studies (GWAS) have not yet identified any common genetic variants that contribute to risk. There is evidence that aggression or conduct disorder in children with ADHD indexes higher genetic loading and clinical severity. The authors examine whether common genetic variants considered en masse as polygenic scores for ADHD are especially enriched in children with comorbid conduct disorder. METHOD Polygenic scores derived from an ADHD GWAS meta-analysis were calculated in an independent ADHD sample (452 case subjects, 5,081 comparison subjects). Multivariate logistic regression analyses were employed to compare polygenic scores in the ADHD and comparison groups and test for higher scores in ADHD case subjects with comorbid conduct disorder relative to comparison subjects and relative to those without comorbid conduct disorder. Association with symptom scores was tested using linear regression. RESULTS Polygenic risk for ADHD, derived from the meta-analysis, was higher in the independent ADHD group than in the comparison group. Polygenic score was significantly higher in ADHD case subjects with conduct disorder relative to ADHD case subjects without conduct disorder. ADHD polygenic score showed significant association with comorbid conduct disorder symptoms. This relationship was explained by the aggression items. CONCLUSIONS Common genetic variation is relevant to ADHD, especially in individuals with comorbid aggression. The findings suggest that the previously published ADHD GWAS meta-analysis contains weak but true associations with common variants, support for which falls below genome-wide significance levels. The findings also highlight the fact that aggression in ADHD indexes genetic as well as clinical severity.
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To access publisher's full text version of this article click on the hyperlink at the bottom of the page
Additional Links
http://dx.doi.org/10.1176/appi.ajp.2013.12081129
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3935265/
http://ajp.psychiatryonline.org/data/Journals/AJP/927348/909.pdf
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Archived with thanks to The American journal of psychiatry
ae974a485f413a2113503eed53cd6c53
10.1176/appi.ajp.2013.12081129
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English Journal Articles (Peer Reviewed)

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