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Updated: Apr 9, 2026

Investigating Drivers of Antireward in Addiction Behavior with Anatomically Specific Single-Cell Gene Expression Methods
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Replication study implicates COMT val158met polymorphism as a modulator of probabilistic reward learning.

T M Lancaster1, E A Heerey2, K Mantripragada1,3

  • 1Neuroscience and Mental Health Research Institute, Cardiff University, Cardiff, UK.

Genes, Brain, and Behavior
|June 23, 2015
PubMed
Summary
This summary is machine-generated.

The catechol-O-methyltransferase (COMT) gene val158met polymorphism influences reward responsiveness, with COMT met homozygotes showing increased reward-seeking behavior. This genetic variation impacts dopamine levels and decision-making, potentially affecting conditions like anhedonia.

Keywords:
AnhedoniaBARTCOMTdopaminegeneticsprefrontalreward responsivenessreward seekingsignal detectionval158met

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Area of Science:

  • Neuroscience
  • Behavioral Genetics
  • Psychopharmacology

Background:

  • The catechol-O-methyltransferase (COMT) gene val158met polymorphism influences dopamine metabolism in the prefrontal cortex.
  • Prefrontal dopamine levels are implicated in modulating reward-guided decision-making, risk assessment, and reward responsiveness.
  • Previous research indicated COMT met homozygotes exhibit heightened reward responsiveness.

Purpose of the Study:

  • To replicate findings on the association between the COMT val158met polymorphism and reward responsiveness in a larger, independent cohort.
  • To investigate the influence of COMT genotype on both reward responsiveness and risk-seeking behavior.
  • To further elucidate the role of prefrontal dopaminergic variation in decision-making processes.

Main Methods:

  • A cohort of 101 Caucasian UK university students and staff participated.
  • Participants underwent behavioral tasks assessing reward responsiveness (response bias) and risk-taking (Balloon Analogue Risk Task).
  • COMT val158met genotype was analyzed for its association with behavioral outcomes.

Main Results:

  • A significant trial × COMT genotype interaction confirmed the role of COMT in the incremental acquisition of response bias (P = 0.047).
  • COMT met homozygotes demonstrated significantly higher reward responsiveness by the end of the task compared to val/val homozygotes (P = 0.028 and P = 0.007).
  • No significant main effects of COMT genotype were observed on overall response bias or risk-seeking behavior.

Conclusions:

  • These findings provide additional evidence supporting the role of prefrontal dopaminergic variation, influenced by the COMT gene, in reward responsiveness.
  • The study suggests that COMT genotype may specifically affect reward responsiveness rather than general risk-seeking behavior.
  • The results have potential implications for understanding neuropsychiatric disorders characterized by reward processing deficits, such as anhedonia.