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Norepinephrine genes predict response time variability and methylphenidate-induced changes in neuropsychological function in attention deficit hyperactivity disorder.

Authors
Kim, BN; Kim, JW; Cummins, TD; Bellgrove, MA; Hawi, Z; Hong, SB; Yang, YH; Kim, HJ; Shin, MS; Cho, SC; Kim, JH; Son, JW; Shin, YM; Chung, US; Han, DH
Citation
Journal of clinical psychopharmacology, 33(3):356-362, 2013
Journal Title
Journal of clinical psychopharmacology
ISSN
0271-07491533-712X
Abstract
Noradrenergic dysfunction may be associated with cognitive impairments in attention-deficit/hyperactivity disorder (ADHD), including increased response time variability, which has been proposed as a leading endophenotype for ADHD. The aim of this study was to examine the relationship between polymorphisms in the α-2A-adrenergic receptor (ADRA2A) and norepinephrine transporter (SLC6A2) genes and attentional performance in ADHD children before and after pharmacological treatment.One hundred one medication-naive ADHD children were included. All subjects were administered methylphenidate (MPH)-OROS for 12 weeks. The subjects underwent a computerized comprehensive attention test to measure the response time variability at baseline before MPH treatment and after 12 weeks. Additive regression analyses controlling for ADHD symptom severity, age, sex, IQ, and final dose of MPH examined the association between response time variability on the comprehensive attention test measures and allelic variations in single-nucleotide polymorphisms of the ADRA2A and SLC6A2 before and after MPH treatment.Increasing possession of an A allele at the G1287A polymorphism of SLC6A2 was significantly related to heightened response time variability at baseline in the sustained (P = 2.0 × 10) and auditory selective attention (P = 1.0 × 10) tasks. Response time variability at baseline increased additively with possession of the T allele at the DraI polymorphism of the ADRA2A gene in the auditory selective attention task (P = 2.0 × 10). After medication, increasing possession of a G allele at the MspI polymorphism of the ADRA2A gene was associated with increased MPH-related change in response time variability in the flanker task (P = 1.0 × 10).Our study suggested an association between norepinephrine gene variants and response time variability measured at baseline and after MPH treatment in children with ADHD. Our results add to a growing body of evidence, suggesting that response time variability is a viable endophenotype for ADHD and suggesting its utility as a surrogate end point for measuring stimulant response in pharmacogenetic studies.
MeSH terms
Attention Deficit Disorder with Hyperactivity/*drug therapy/genetics/physiopathologyCentral Nervous System Stimulants/therapeutic useChildDiagnosis, Computer-AssistedFemaleHumansMaleMethylphenidate/*therapeutic useNorepinephrine/metabolismNorepinephrine Plasma Membrane Transport Proteins/*geneticsPharmacogeneticsProspective StudiesReceptors, Adrenergic, alpha-2/*geneticsRegression AnalysisSeverity of Illness IndexTime FactorsTreatment Outcome
DOI
10.1097/JCP.0b013e31828f9fc3
PMID
23609393
Appears in Collections:
Journal Papers > School of Medicine / Graduate School of Medicine > Psychiatry & Behavioural Sciences
AJOU Authors
신, 윤미
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