Genetic analysis supports ADHD as a causal risk factor for substance use disorders
GWAS analysis confirmed shared genetic architecture between ADHD and substance use disorders, with evidence that genetic liability to ADHD causally increases SUD risk, while lifetime cannabis use genetically influenced ADHD risk.
Quick Facts
What This Study Found
The study confirmed a common genetic background between ADHD and SUD using both clinical (n=989) and population GWAS data. Mendelian randomization supported a causal effect of ADHD liability on SUD risk, and found a novel bidirectional effect where genetic liability for lifetime cannabis use influenced ADHD risk.
Key Numbers
Clinical sample: 989 subjects. Five SUD phenotypes tested: lifetime cannabis use, alcohol dependence, smoking initiation, cigarettes per day, and drinks per week. Shared genetic background confirmed for cannabis use, alcohol dependence, and smoking initiation.
How They Did This
Combined in-house clinical sample (989 ADHD subjects) with pre-existing GWAS datasets for five SUD-related phenotypes. Used polygenic risk score analysis, genetic correlation, and Mendelian randomization to assess shared genetics and causal relationships.
Why This Research Matters
Understanding the genetic basis of ADHD-SUD comorbidity can improve screening and treatment approaches, particularly the novel finding that cannabis use liability may itself influence ADHD.
The Bigger Picture
Nearly one in four people with substance use disorders also has ADHD. These genetic findings support screening for ADHD in all SUD patients and monitoring substance use in ADHD patients.
What This Study Doesn't Tell Us
Cross-sectional genetic analysis cannot capture environmental interactions. Clinical sample was modest in size. Mendelian randomization assumptions may not fully hold.
Questions This Raises
- ?How does the bidirectional genetic relationship between cannabis use and ADHD manifest clinically?
- ?Could early ADHD treatment reduce the genetic risk pathway to substance use disorders?
Trust & Context
- Key Stat:
- Genetic liability to ADHD causally increases substance use disorder risk
- Evidence Grade:
- Combines clinical and population genetic data with Mendelian randomization, though limited by sample size and cross-sectional design.
- Study Age:
- Published in 2021.
- Original Title:
- Genetic overlap and causality between substance use disorder and attention-deficit and hyperactivity disorder.
- Published In:
- American journal of medical genetics. Part B, Neuropsychiatric genetics : the official publication of the International Society of Psychiatric Genetics, 186(3), 140-150 (2021)
- Authors:
- Vilar-Ribó, Laura, Sánchez-Mora, Cristina(3), Rovira, Paula(2), Richarte, Vanesa, Corrales, Montserrat, Fadeuilhe, Christian, Arribas, Lorena, Casas, Miquel, Ramos-Quiroga, Josep Antoni, Ribasés, Marta, Soler Artigas, María
- Database ID:
- RTHC-03596
Evidence Hierarchy
A snapshot of a population at one point in time.
What do these levels mean? →Frequently Asked Questions
Is the link between ADHD and substance use genetic?
Partially. This study found shared genetic variants between ADHD and multiple substance use phenotypes, including cannabis use, alcohol dependence, and smoking initiation.
Does cannabis use genetically influence ADHD?
The study found novel evidence that genetic liability for lifetime cannabis use was associated with ADHD risk, suggesting a bidirectional genetic relationship.
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Cite This Study
https://rethinkthc.com/research/RTHC-03596APA
Vilar-Ribó, Laura; Sánchez-Mora, Cristina; Rovira, Paula; Richarte, Vanesa; Corrales, Montserrat; Fadeuilhe, Christian; Arribas, Lorena; Casas, Miquel; Ramos-Quiroga, Josep Antoni; Ribasés, Marta; Soler Artigas, María. (2021). Genetic overlap and causality between substance use disorder and attention-deficit and hyperactivity disorder.. American journal of medical genetics. Part B, Neuropsychiatric genetics : the official publication of the International Society of Psychiatric Genetics, 186(3), 140-150. https://doi.org/10.1002/ajmg.b.32827
MLA
Vilar-Ribó, Laura, et al. "Genetic overlap and causality between substance use disorder and attention-deficit and hyperactivity disorder.." American journal of medical genetics. Part B, 2021. https://doi.org/10.1002/ajmg.b.32827
RethinkTHC
RethinkTHC Research Database. "Genetic overlap and causality between substance use disorder..." RTHC-03596. Retrieved from https://rethinkthc.com/research/vilar-ribo-2021-genetic-overlap-and-causality
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.