Association of dopamine gene variants, emotion dysregulation and ADHD in autism spectrum disorder
- PMID:24780147
- PMCID: PMC4084560
- DOI: 10.1016/j.ridd.2014.04.007
Association of dopamine gene variants, emotion dysregulation and ADHD in autism spectrum disorder
Abstract
The aim of the present study was to evaluate the association of dopaminergic gene variants with emotion dysregulation (EMD) and attention-deficit/hyperactivity disorder (ADHD) symptoms in children with autism spectrum disorder (ASD). Three dopamine transporter gene (SLC6A3/DAT1) polymorphisms (intron8 5/6 VNTR, 3'-UTR 9/10 VNTR, rs27072 in the 3'-UTR) and one dopamine D2 receptor gene (DRD2) variant (rs2283265) were selected for genotyping based on à priori evidence of regulatory activity or, in the case of DAT1 9/10 VNTR, commonly reported associations with ADHD. A sample of 110 children with ASD was assessed with a rigorously validated DSM-IV-referenced rating scale. Global EMD severity (parents' ratings) was associated with DAT1 intron8 (ηp(2)=.063) and rs2283265 (ηp(2)=.044). Findings for DAT1 intron8 were also significant for two EMD subscales, generalized anxiety (ηp(2)=.065) and depression (ηp(2)=.059), and for DRD2 rs2283265, depression (ηp(2)=.053). DRD2 rs2283265 was associated with teachers' global ratings of ADHD (ηp(2)=.052). DAT1 intron8 was associated with parent-rated hyperactivity (ηp(2)=.045) and both DAT1 9/10 VNTR (ηp(2)=.105) and DRD2 rs2283265 (ηp(2)=.069) were associated with teacher-rated inattention. These findings suggest that dopaminergic gene polymorphisms may modulate EMD and ADHD symptoms in children with ASD but require replication with larger independent samples.
Keywords: ADHD; Autism; Autism spectrum disorder; DAT1; DRD2; Depression; Emotion dysregulation.
Copyright © 2014 Elsevier Ltd. All rights reserved.
Conflict of interest statement
Conflicts of Interest
Dr. Gadow is shareholder in Checkmate Plus, publisher of the Child Symptom Inventory-4. For the remaining authors, none were declared.
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