Cannabis Use Disorder Linked to Changes in Dopamine Gene Methylation and Personality Traits
Among 490 males, people with cannabis use disorder showed altered methylation of the DAT1 dopamine transporter gene, which was associated with specific personality traits including higher neuroticism and anxiety.
Quick Facts
What This Study Found
Individuals with CUD showed altered DAT1 methylation levels compared to controls. These methylation changes were associated with personality traits measured by NEO-FFI (particularly neuroticism) and state-trait anxiety. The findings suggest cannabis use may produce epigenetic changes in the dopamine system that relate to psychological traits.
Key Numbers
490 male participants (212 CUD, 278 controls). DAT1 methylation: altered in CUD. Associated with: neuroticism (NEO-FFI), anxiety (STAI). Males only.
How They Did This
Case-control study of 490 males (212 with CUD, 278 controls). Assessed personality via NEO-FFI and anxiety via STAI. DNA methylation levels at the DAT1 gene measured and compared between groups, then correlated with personality measures.
Why This Research Matters
Epigenetic changes from cannabis use could explain lasting neuropsychiatric effects. The link between DAT1 methylation and personality traits in CUD suggests a molecular pathway connecting cannabis use to psychological changes.
The Bigger Picture
Epigenetic changes are potentially reversible, unlike genetic mutations. If cannabis-induced DAT1 methylation changes drive personality and anxiety differences, these could theoretically normalize with cessation, though this has not been tested.
What This Study Doesn't Tell Us
Males only, limiting generalizability. Cross-sectional design cannot determine if methylation changes preceded or followed CUD. Single gene examined. Cannot rule out confounders. Methylation measured in peripheral tissue, not brain.
Questions This Raises
- ?Do DAT1 methylation changes reverse after cannabis cessation?
- ?Would female participants show the same patterns?
Trust & Context
- Key Stat:
- Evidence Grade:
- Adequate sample with molecular measures and validated psychological assessments, but males only and cross-sectional design limit to moderate.
- Study Age:
- Recently published epigenetic study.
- Original Title:
- Methylation Status of the DAT1 Dopamine Transporter Gene in Individuals With Cannabis Use Disorder: Associations With Personality Traits.
- Published In:
- Genes, brain, and behavior, 24(6), e70040 (2025)
- Authors:
- Suchanecka, Aleksandra(2), Recław, Remigiusz, Chmielowiec, Krzysztof(3), Chmielowiec, Jolanta, Masiak, Jolanta, Grzywacz, Anna
- Database ID:
- RTHC-07741
Evidence Hierarchy
Watches what happens naturally without intervening.
What do these levels mean? →Frequently Asked Questions
Does cannabis change your DNA?
Not the DNA sequence itself, but this study found cannabis use disorder was associated with changes in DNA methylation (an epigenetic mark that affects gene activity) at the DAT1 dopamine transporter gene.
Can these changes be reversed?
Epigenetic changes are potentially reversible, unlike permanent DNA mutations. However, this study did not test whether the DAT1 methylation changes normalize after stopping cannabis use.
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Cite This Study
https://rethinkthc.com/research/RTHC-07741APA
Suchanecka, Aleksandra; Recław, Remigiusz; Chmielowiec, Krzysztof; Chmielowiec, Jolanta; Masiak, Jolanta; Grzywacz, Anna. (2025). Methylation Status of the DAT1 Dopamine Transporter Gene in Individuals With Cannabis Use Disorder: Associations With Personality Traits.. Genes, brain, and behavior, 24(6), e70040. https://doi.org/10.1111/gbb.70040
MLA
Suchanecka, Aleksandra, et al. "Methylation Status of the DAT1 Dopamine Transporter Gene in Individuals With Cannabis Use Disorder: Associations With Personality Traits.." Genes, 2025. https://doi.org/10.1111/gbb.70040
RethinkTHC
RethinkTHC Research Database. "Methylation Status of the DAT1 Dopamine Transporter Gene in ..." RTHC-07741. Retrieved from https://rethinkthc.com/research/suchanecka-2025-methylation-status-of-the
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.