SLC2A3 single-nucleotide polymorphism and duplication influence cognitive processing and population-specific risk for
Sören Merker1, Andreas Reif2, Georg C Ziegler1
1Division of Molecular Psychiatry, ADHD Clinical Research Unit, Laboratory of Translational Neuroscience, Center of Mental Health, University of Würzburg, Würzburg, Germany.
Genetic variations in SLC2A3, impacting glucose transporter-3 (GLUT3) function, are linked to attention-deficit/hyperactivity disorder (ADHD). This research provides evidence for GLUT3 dysfunction contributing to ADHD
Area of Science:
- Neurogenetics
- Neurodevelopmental Disorders
- Molecular Psychiatry
Background:
- Attention-deficit/hyperactivity disorder (ADHD) is a prevalent, highly heritable neurodevelopmental disorder.
- Genetic screening identified a duplication in SLC2A3, which encodes glucose transporter-3 (GLUT3), in ADHD patients.
- GLUT3 is crucial for cerebral glucose metabolism, influencing neuronal activity, brain development, and neural plasticity.
Purpose of the Study:
- To investigate the genetic and functional role of GLUT3 in ADHD.
- To provide further evidence supporting GLUT3 dysfunction in the pathophysiology of ADHD.
Main Methods:
- Case-control association analyses of SLC2A3 single-nucleotide polymorphisms (SNPs) and copy number variants (CNVs) in European ADHD cohorts.
- Analysis of SLC2A3 expression in peripheral cells.
- Functional electroencephalography (EEG) recordings during neurocognitive tasks.
- Assessment of food energy content perception.
Main Results:
- Meta-analysis revealed an association between SLC2A3 SNP rs12842 and ADHD.
- SLC2A3 duplications were enriched in German ADHD patients; a CNV + rs12842 haplotype affected ADHD risk in German and Spanish cohorts.
- Duplication carriers showed increased SLC2A3 mRNA expression, altered event-related potentials linked to working memory and response control deficits, and underestimation of high-caloric food energy.
Conclusions:
- Common and rare variations in SLC2A3 influence neuronal glucose utilization and energy homeostasis.
- These variations may contribute to the neurocognitive deficits associated with ADHD risk.
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