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COMT Associations with Disordered Gambling and Drinking Measures.

Casey R Guillot1, Jennifer R Fanning, Tiebing Liang

  • 1University of Southern California Keck School of Medicine, 2250 Alcazar St CSC 240, Los Angeles, CA, 90033, USA, cguillot@usc.edu.

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The catechol-O-methyltransferase (COMT) Met/Met genotype may increase the risk for both gambling disorder and alcohol dependence. This genetic factor appears to contribute to the development of these related behavioral issues.

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Area of Science:

  • Neurogenetics
  • Behavioral Genetics
  • Psychiatric Genetics

Background:

  • Disordered gambling and alcohol dependence share genetic influences.
  • The catechol-O-methyltransferase (COMT) rs4680 polymorphism has been inconsistently linked to gambling and alcohol problems.
  • Few studies have jointly investigated COMT rs4680 in relation to both conditions, and most used case-control designs.

Purpose of the Study:

  • To investigate the association between the COMT rs4680 polymorphism and gambling and drinking problems.
  • To examine these associations in a nonclinical sample using dimensional and categorical measures.
  • To explore the potential shared genetic underpinnings of these disorders.

Main Methods:

  • Genotyping of the COMT rs4680 (Val158Met) polymorphism in 139 Caucasian adults.
  • Assessment of gambling and alcohol problems using both dimensional scales and categorical diagnoses.
  • Statistical analysis to determine the relationship between COMT rs4680 genotypes and problem severity/presence.

Main Results:

  • The COMT rs4680 polymorphism was significantly associated with both dimensionally and categorically measured gambling and drinking problems.
  • Individuals with the COMT Met/Met genotype showed a higher likelihood of experiencing both gambling and alcohol problems.
  • This finding suggests a potential genetic contribution of COMT rs4680 to the co-occurrence of these disorders.

Conclusions:

  • The COMT Met/Met genotype may serve as a genetic risk factor for the development of both gambling disorder and alcohol dependence.
  • These findings highlight the role of specific genetic variations in the shared etiology of substance use and behavioral addictions.
  • Further research is warranted to elucidate the precise mechanisms underlying this genetic association.