Advancing substance use disorder biology by studying underlying gene x environment interactions.
Level 5 - mechanism / opinion, no new human data
Narrative review outlining biological mechanisms and model systems without new human data.
PubMed 41702263 · doi:10.1016/j.gde.2026.102443
What was done
This narrative review examines the biological mechanisms underlying substance use disorders (SUDs), focusing on gene-by-environment interactions. It discusses how common noncoding genetic variants interact with environmental substance exposures during sensitive neurodevelopmental periods (in utero and adolescence), and reviews experimental platforms including animal models, human genomics, and human stem cell systems.
What was found
The abstract reports no empirical data or quantitative findings. It conceptually outlines that SUD genetic risk variants predominantly occur in noncoding regions, emphasizes that drug exposure during critical developmental windows modifies genetic vulnerability, and highlights experimental strategies to establish causal mechanisms despite confounding in human studies.
Why it matters
Clarifying how noncoding genetic risk interacts with drug exposures at specific neurodevelopmental stages is critical for differentiating initial drug use from dependence and discovering targeted avenues for prevention and therapy.
Limits
The paper is a narrative review with no primary empirical dataset, sample size, or systematic review methodology. Observational human research in this field is deeply confounded by the simultaneous presence of high genetic risk and developmental drug exposures.
Cited by
- supports Genetic predisposition to addiction represents elevated risk rather than a deterministic outcome.