Among 515 men, cannabis-dependent individuals showed higher neuroticism, anxiety, and openness and lower agreeableness than controls, with the DRD2 rs1799732 allele frequency differing between groups and influencing agreeableness.
Genetics researchers, addiction specialists, and readers interested in the biology of cannabis dependence.
DRD2 gene variant frequency differed between cannabis-dependent and control groups
What the researchers found
Cannabis-dependent individuals scored significantly higher on neuroticism, openness, state anxiety, and trait anxiety, and lower on extraversion, agreeableness, and conscientiousness compared to controls. The DRD2 rs1799732 allele frequency differed between groups, and the genotype significantly influenced agreeableness scores in both cannabis-dependent and control groups.
Why it matters
Identifying genetic variants that influence personality traits associated with cannabis dependence could inform personalized prevention and treatment strategies.
The numbers in context
515 males (214 cannabis-dependent, 301 controls). Significant allele frequency difference for DRD2 rs1799732. Cannabis group: higher neuroticism, openness, anxiety; lower extraversion, agreeableness, conscientiousness.
How the study worked
Case-control study of 214 male cannabis-dependent patients and 301 non-addicted controls. Personality assessed with NEO-FFI, anxiety with STAI. DRD2 rs1799732 genotyping by real-time PCR. Multivariate ANOVA analyzed genotype-personality interactions.
What this study cannot tell us
Only males studied. Case-control design cannot determine causation. Single genetic variant among many possible contributors. Personality differences may be consequences rather than precursors of addiction. Polish sample limits generalizability.
How to read the evidence
Reasonable sample size with genetic and psychological measures, but case-control design and single-variant focus limit conclusions.
When this study was published
Published in 2022.
The bigger picture
The DRD2 gene codes for dopamine D2 receptors, which are central to reward processing. Finding that a specific variant influences both addiction risk and personality suggests shared genetic architecture underlying substance use vulnerability.
Questions still open
- Does this variant predict cannabis dependence risk before use begins? Would the same patterns appear in women? Could DRD2 genotyping inform treatment selection for cannabis dependence?
Common questions
Is cannabis addiction genetic?
Do cannabis-dependent people have different personalities?
Read the original research
Association between Polymorphism rs1799732 of DRD2 Dopamine Receptor Gene and Personality Traits among Cannabis Dependency.
International journal of environmental research and public health, 19(17)
Citation
Chmielowiec, Jolanta; Chmielowiec, Krzysztof; Masiak, Jolanta; Śmiarowska, Małgorzata; Strońska-Pluta, Aleksandra; Dziedziejko, Violetta; Grzywacz, Anna. (2022). Association between Polymorphism rs1799732 of DRD2 Dopamine Receptor Gene and Personality Traits among Cannabis Dependency.. International journal of environmental research and public health, 19(17). https://doi.org/10.3390/ijerph191710915
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