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The molecular genetic architecture of attention deficit hyperactivity disorder.
Mol Psychiatry 2015; 20(3):289-97MP

Abstract

Attention deficit hyperactivity disorder (ADHD) is a common childhood behavioral condition which affects 2-10% of school age children worldwide. Although the underlying molecular mechanism for the disorder is poorly understood, familial, twin and adoption studies suggest a strong genetic component. Here we provide a state-of-the-art review of the molecular genetics of ADHD incorporating evidence from candidate gene and linkage designs, as well as genome-wide association (GWA) studies of common single-nucleotide polymorphisms (SNPs) and rare copy number variations (CNVs). Bioinformatic methods such as functional enrichment analysis and protein-protein network analysis are used to highlight biological processes of likely relevance to the aetiology of ADHD. Candidate gene associations of minor effect size have been replicated across a number of genes including SLC6A3, DRD5, DRD4, SLC6A4, LPHN3, SNAP-25, HTR1B, NOS1 and GIT1. Although case-control SNP-GWAS have had limited success in identifying common genetic variants for ADHD that surpass critical significance thresholds, quantitative trait designs suggest promising associations with Cadherin13 and glucose-fructose oxidoreductase domain 1 genes. Further, CNVs mapped to glutamate receptor genes (GRM1, GRM5, GRM7 and GRM8) have been implicated in the aetiology of the disorder and overlap with bioinformatic predictions based on ADHD GWAS SNP data regarding enriched pathways. Although increases in sample size across multi-center cohorts will likely yield important new results, we advocate that this must occur in parallel with a shift away from categorical case-control approaches that view ADHD as a unitary construct, towards dimensional approaches that incorporate endophenotypes and statistical classification methods.

Authors+Show Affiliations

School of Psychological Sciences, Monash University, Melbourne, VIC, Australia.School of Psychological Sciences, Monash University, Melbourne, VIC, Australia.School of Psychological Sciences, Monash University, Melbourne, VIC, Australia.School of Psychological Sciences, Monash University, Melbourne, VIC, Australia.School of Psychological Sciences, Monash University, Melbourne, VIC, Australia.New York City College of Technology, City University of New York, New York, NY, USA.School of Psychological Sciences, Monash University, Melbourne, VIC, Australia.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Review

Language

eng

PubMed ID

25600112

Citation

Hawi, Z, et al. "The Molecular Genetic Architecture of Attention Deficit Hyperactivity Disorder." Molecular Psychiatry, vol. 20, no. 3, 2015, pp. 289-97.
Hawi Z, Cummins TD, Tong J, et al. The molecular genetic architecture of attention deficit hyperactivity disorder. Mol Psychiatry. 2015;20(3):289-97.
Hawi, Z., Cummins, T. D., Tong, J., Johnson, B., Lau, R., Samarrai, W., & Bellgrove, M. A. (2015). The molecular genetic architecture of attention deficit hyperactivity disorder. Molecular Psychiatry, 20(3), pp. 289-97. doi:10.1038/mp.2014.183.
Hawi Z, et al. The Molecular Genetic Architecture of Attention Deficit Hyperactivity Disorder. Mol Psychiatry. 2015;20(3):289-97. PubMed PMID: 25600112.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The molecular genetic architecture of attention deficit hyperactivity disorder. AU - Hawi,Z, AU - Cummins,T D R, AU - Tong,J, AU - Johnson,B, AU - Lau,R, AU - Samarrai,W, AU - Bellgrove,M A, Y1 - 2015/01/20/ PY - 2014/04/18/received PY - 2014/11/14/revised PY - 2014/11/19/accepted PY - 2015/1/21/entrez PY - 2015/1/21/pubmed PY - 2016/3/5/medline SP - 289 EP - 97 JF - Molecular psychiatry JO - Mol. Psychiatry VL - 20 IS - 3 N2 - Attention deficit hyperactivity disorder (ADHD) is a common childhood behavioral condition which affects 2-10% of school age children worldwide. Although the underlying molecular mechanism for the disorder is poorly understood, familial, twin and adoption studies suggest a strong genetic component. Here we provide a state-of-the-art review of the molecular genetics of ADHD incorporating evidence from candidate gene and linkage designs, as well as genome-wide association (GWA) studies of common single-nucleotide polymorphisms (SNPs) and rare copy number variations (CNVs). Bioinformatic methods such as functional enrichment analysis and protein-protein network analysis are used to highlight biological processes of likely relevance to the aetiology of ADHD. Candidate gene associations of minor effect size have been replicated across a number of genes including SLC6A3, DRD5, DRD4, SLC6A4, LPHN3, SNAP-25, HTR1B, NOS1 and GIT1. Although case-control SNP-GWAS have had limited success in identifying common genetic variants for ADHD that surpass critical significance thresholds, quantitative trait designs suggest promising associations with Cadherin13 and glucose-fructose oxidoreductase domain 1 genes. Further, CNVs mapped to glutamate receptor genes (GRM1, GRM5, GRM7 and GRM8) have been implicated in the aetiology of the disorder and overlap with bioinformatic predictions based on ADHD GWAS SNP data regarding enriched pathways. Although increases in sample size across multi-center cohorts will likely yield important new results, we advocate that this must occur in parallel with a shift away from categorical case-control approaches that view ADHD as a unitary construct, towards dimensional approaches that incorporate endophenotypes and statistical classification methods. SN - 1476-5578 UR - https://www.unboundmedicine.com/medline/citation/25600112/The_molecular_genetic_architecture_of_attention_deficit_hyperactivity_disorder_ L2 - http://dx.doi.org/10.1038/mp.2014.183 DB - PRIME DP - Unbound Medicine ER -