Abstract
Studies provide ample evidence for a dysfunction in dopaminergic neurotransmission in Attention-Deficit/Hyperactivity Disorder (ADHD). In that respect, a common variable number of tandem repeats (VNTR) polymorphism in the 3′ untranslated region (UTR) of the dopamine transporter gene (SLC6A3) has been repeatedly associated with the disorder. Here, we examined the influence of the common 9- and 10-repeat alleles of SLC6A3 on prefrontal brain functioning and cognitive response control in a large sample of adult ADHD patients (n=161) and healthy controls (n=109). To this end, we inspected a neurophysiological marker of cognitive response control (NoGo anteriorization, NGA) elicited by means of a Go-NoGo task (continuous performance test, CPT). Within the group of ADHD patients, nine-repeat allele carriers showed significantly reduced NGA, whereas no influence of SLC6A3 genotype was observed in the control group. In contrast to previous association studies of children, the nine-repeat—not the 10-repeat—allele was associated with functional impairments in our sample of adult ADHD patients. Our findings confirm a significant effect of the SLC6A3 genotype on the neurophysiological correlates of cognitive response control in ADHD, and indicate that still to-be-identified age-related factors are important variables modulating the effect of genetic factors on endophenotypes.
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This study was supported by the Deutsche Forschungsgemeinschaft (KFO 125, SFB TRR 58 C4) and the Bundesministerium für Bildung und Forschung (BMBF 01GV0605).
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Dresler, T., Ehlis, AC., Heinzel, S. et al. Dopamine Transporter (SLC6A3) Genotype Impacts Neurophysiological Correlates of Cognitive Response Control in an Adult Sample of Patients with ADHD. Neuropsychopharmacol 35, 2193–2202 (2010). https://doi.org/10.1038/npp.2010.91
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DOI: https://doi.org/10.1038/npp.2010.91
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