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Genome‐wide association study of response to methylphenidate in 187 children with attention‐deficit/hyperactivity disorder
Author(s) -
Mick Eric,
Neale Benjamin,
Middleton Frank A.,
McGough James J.,
Faraone Stephen V.
Publication year - 2008
Publication title -
american journal of medical genetics part b: neuropsychiatric genetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.393
H-Index - 126
eISSN - 1552-485X
pISSN - 1552-4841
DOI - 10.1002/ajmg.b.30865
Subject(s) - single nucleotide polymorphism , methylphenidate , snp , genome wide association study , attention deficit hyperactivity disorder , norepinephrine transporter , genetic association , genotyping , medicine , genetics , gene , biology , bioinformatics , psychiatry , genotype , transporter
We conducted a genome‐wide association study of symptom response in an open‐label study of a methylphenidate transdermal system (MTS). All DNA extraction and genotyping was conducted at SUNY Upstate Medical University using the Affymetrix Genome‐Wide Human SNP Array 6.0. All quality control and association analyses were conducted using the software package PLINK. After data cleaning and quality control, there were 187 subjects (72% (N = 135) male) with mean age 9.2 ± 2.0 years and 319,722 SNPs available for analysis. The most statistically significant association (rs9627183 and rs11134178; P = 3 × 10 −6 ) fell short of the threshold for a genome‐wide significant association. The most intriguing association among suggestive findings (rs3792452; P = 2.6 × 10 −5 ) was with the metabotropic glutamate receptor 7 gene (GRM7) as it is expressed in brain structures also previously associated with ADHD. Among the 102 available SNPs covering previously studied candidate genes, two SNPs within the norepinephrine transporter gene (NET, SLC6A2 ) were significant at P ≤ 1 × 10 −2 . These results should be considered preliminary until replicated in larger adequately powered, controlled samples but do suggest that noradrenergic and possibly glutaminergic genes may be involved with response to methylphenidate. © 2008 Wiley‐Liss, Inc.