Interaction Between DRD2 rs1076560 Genotype and Stimulant Dependence on Impulsivity and Self-Reported ADHD Traits in...

Area of Science:

• Neuroscience
• Genetics
• Psychiatry

Background:

• The dopamine D2 receptor (DRD2) is crucial for cognitive control and reward processing.
• The rs1076560 polymorphism in DRD2 affects receptor expression, potentially influencing impulsivity and stimulant use disorder risk.

Purpose of the Study:

• To investigate gene-environment interactions between DRD2 rs1076560 and stimulant dependence.
• To assess the impact on impulsivity, ADHD traits, and hedonic capacity.

Main Methods:

• 517 men (235 stimulant-dependent, 282 controls) completed impulsivity (BIS-11), ADHD (ASRS v1.1), and pleasure (SHAPS) scales.
• Genotyping for rs1076560 was performed using real-time PCR.
• Two-way ANOVAs analyzed genotype-by-group interactions.

Main Results:

• Significant genotype-by-group interactions were found for impulsivity and ADHD traits.
• In stimulant-dependent individuals, C/C homozygotes had higher attentional impulsivity and dysregulation.
• In controls, A/A homozygotes showed higher motor and non-planning impulsivity.

Conclusions:

• DRD2 rs1076560 moderates impulsivity traits via dopaminergic pathways linked to executive dysfunction in stimulant use disorders.
• Findings suggest a neurobiological mechanism for addiction vulnerability.
• Results may guide precision medicine in neurology and psychiatry.