A genetic variant in the P2RX7 gene may increase risk of psychotic experiences among cannabis users
A genome-wide study identified a genetic variant in P2RX7 associated with higher levels of psychotic experiences in regular cannabis users, replicated in an independent cohort and supported by in vitro experiments.
Quick Facts
What This Study Found
A SNP in the P2RX7 gene (rs7958311) was associated with increased psychotic-like experiences in regular cannabis users (p = 1.10 x 10^-7) and was replicated in the IMAGEN cohort (p = 0.020). In vitro, THC and CBD reduced the P2X7 receptor's immune response in a genotype-dependent manner.
Key Numbers
Discovery: rs7958311 association p = 1.10 x 10^-7 (N = 1,262). Replication: p = 0.020 (N = 1,217). P2X7 receptor immune response was reduced by THC and CBD in a genotype-dependent manner.
How They Did This
Genome-wide environment-interaction study (GWEIS) in 1,262 individuals without psychiatric disorders, enriched for extremes of cannabis use and psychotic-like experiences. Replication in the IMAGEN cohort (n = 1,217). Functional validation through in vitro monocyte experiments.
Why This Research Matters
This identifies a specific genetic pathway that may explain why some cannabis users develop psychotic symptoms while others do not, potentially opening doors for targeted prevention.
The Bigger Picture
Most cannabis users do not develop psychosis. Identifying genetic variants that increase vulnerability could eventually allow for personalized risk assessment.
What This Study Doesn't Tell Us
Discovery p-value did not reach genome-wide significance (5 x 10^-8); enriched sampling design may limit generalizability; in vitro immune findings may not fully reflect brain-level effects.
Questions This Raises
- ?Could P2RX7 antagonists reduce psychosis risk in genetically vulnerable cannabis users?
- ?How does this genetic variant interact with other known risk factors like COMT or AKT1?
Trust & Context
- Key Stat:
- P2RX7 variant rs7958311 linked to psychotic experiences in cannabis users (p = 1.10 x 10^-7)
- Evidence Grade:
- Genome-wide study with independent replication and functional validation, though the primary finding narrowly missed genome-wide significance.
- Study Age:
- Published in 2020.
- Original Title:
- Cannabinoids and psychotic symptoms: A potential role for a genetic variant in the P2X purinoceptor 7 (P2RX7) gene.
- Published In:
- Brain, behavior, and immunity, 88, 573-581 (2020)
- Authors:
- Boks, Marco P(5), He, Yujie, Schubart, Chris D(2), Gastel, Willemijn van, Elkrief, Laurent, Huguet, Guillaume, Eijk, Kristel van, Vinkers, Christiaan H, Kahn, René S, Paus, Tomás, Conrod, Patricia, Hol, Elly M, de Witte, Lot D
- Database ID:
- RTHC-02432
Evidence Hierarchy
Watches what happens naturally without intervening.
What do these levels mean? →Frequently Asked Questions
Does this mean there is a "psychosis gene" for cannabis users?
Not exactly. The P2RX7 variant identified appears to increase vulnerability to psychotic experiences specifically when combined with cannabis use. It is one of likely many genetic factors that interact with cannabis exposure.
What does P2RX7 do in the brain?
The P2X7 receptor is involved in neurotransmission, synaptic plasticity, and immune regulation. It has been previously linked to psychiatric disorders, and this study suggests cannabinoids interact with it in a genotype-dependent way.
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Cite This Study
https://rethinkthc.com/research/RTHC-02432APA
Boks, Marco P; He, Yujie; Schubart, Chris D; Gastel, Willemijn van; Elkrief, Laurent; Huguet, Guillaume; Eijk, Kristel van; Vinkers, Christiaan H; Kahn, René S; Paus, Tomás; Conrod, Patricia; Hol, Elly M; de Witte, Lot D. (2020). Cannabinoids and psychotic symptoms: A potential role for a genetic variant in the P2X purinoceptor 7 (P2RX7) gene.. Brain, behavior, and immunity, 88, 573-581. https://doi.org/10.1016/j.bbi.2020.04.051
MLA
Boks, Marco P, et al. "Cannabinoids and psychotic symptoms: A potential role for a genetic variant in the P2X purinoceptor 7 (P2RX7) gene.." Brain, 2020. https://doi.org/10.1016/j.bbi.2020.04.051
RethinkTHC
RethinkTHC Research Database. "Cannabinoids and psychotic symptoms: A potential role for a ..." RTHC-02432. Retrieved from https://rethinkthc.com/research/boks-2020-cannabinoids-and-psychotic-symptoms
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.