DAT1 polymorphism is associated with risk taking in the Balloon Analogue Risk Task (BART)

Area of Science:

• Behavioral genetics
• Neuroscience
• Psychology

Background:

• Individual differences in risk-taking propensity are partly heritable.
• Dopaminergic system variability is linked to risky choice behavior.

Purpose of the Study:

• To investigate the association between a specific dopamine transporter gene (SLC6A3/DAT1) polymorphism and risk-taking behavior.
• To explore the role of dopamine transporter gene variants in modulating risk-taking tendencies.

Main Methods:

• Utilized the Balloon Analogue Risk Task (BART) to assess risk-taking behavior.
• Genotyped participants for a variable number tandem repeat (VNTR) polymorphism in the 3'UTR of the SLC6A3/DAT1 gene.
• Correlated BART performance with DAT1 genotypes.

Main Results:

• Carriers of DAT1 alleles associated with lower striatal dopamine availability demonstrated significantly more risk-taking behavior in the BART.
• Individuals with DAT1 alleles linked to higher striatal dopamine availability exhibited less risk-taking.
• Diminished sensitivity to rewards was suggested as the underlying mechanism for increased risk-taking.

Conclusions:

• The dopamine transporter gene (DAT1) plays a role in individual differences in risk-taking.
• Behavioral genetic approaches are valuable for understanding the neurobiological underpinnings of risk-taking behavior.
• Findings suggest a link between dopamine transporter gene variants, reward sensitivity, and propensity for risk-taking.