Genetics of Addiction: Future Focus on Gene × Environment Interaction?
Level 5 - mechanism / opinion, no new human data
Narrative review and commentary with no primary data or systematic search methodology
PubMed 27588524 · doi:10.15288/jsad.2016.77.684
What was done
This commentary reviewed the state of substance use genetics (specifically smoking, alcohol, and cannabis), evaluated the gap between estimated heritability and the variance explained by identified genetic variants, and outlined methodological recommendations for future gene-environment (G × E) interaction studies.
What was found
The abstract provides no quantitative data or statistical estimates. It notes that substance use has moderate-to-high heritability, but identified variants explain only a small fraction of variance. It identifies both general addiction vulnerability genes and substance-specific variants, while emphasizing that environmental factors (such as socioeconomic status, parental monitoring, and peer pressure) and G × E interactions remain understudied. Recommended approaches include utilizing polygenic risk scores rather than single variants and modeling genetic overlap across different substances.
Why it matters
It highlights the need to integrate social and environmental determinants into genetic association studies of substance use, providing a methodological roadmap using polygenic scores to bridge fundamental biology and risk stratification.
Limits
The paper is an expert perspective and narrative commentary rather than an empirical study or systematic review. The abstract provides no primary data, sample sizes, or quantitative effect sizes.
Cited by
- supports Genetic predisposition to addiction represents elevated risk rather than a deterministic outcome.