Substance use: Interplay between polygenic risk and neighborhood environment

Area of Science:

• Behavioral Genetics
• Environmental Health
• Addiction Research

Background:

• Substance use (tobacco, alcohol, cannabis) presents significant health risks.
• Genetic predisposition and neighborhood environment are known risk factors for substance use.
• The interplay between genetic and environmental factors in substance use requires further investigation.

Purpose of the Study:

• To investigate gene-environment interaction (GxE) between neighborhood characteristics and genetic risk for substance use.
• To examine gene-environment correlation (rGE) in relation to substance use.
• To assess the predictive power of polygenic scores and neighborhood factors on substance use behaviors.

Main Methods:

• Polygenic scores (PGS) were developed for smoking initiation, cigarettes per day, alcohol consumption, and cannabis initiation using genome-wide association studies.
• A large population-based sample (N=6,567) from the Netherlands Twin Register was utilized.
• Neighborhood characteristics, including socioeconomic status (SES) and metropolitanism, were analyzed.

Main Results:

• Both neighborhood characteristics and polygenic scores showed small main effects on substance use.
• A significant gene-environment interaction (GxE) was observed for alcohol use, where the polygenic score was more strongly associated with use in individuals with high SES.
• Weak evidence for gene-environment correlation (rGE) was found, primarily associated with age and cohort.

Conclusions:

• Genetic factors and neighborhood characteristics independently predict substance use.
• The findings suggest a potential interaction between genetic predisposition and socioeconomic status in influencing alcohol consumption.
• Further research is necessary to confirm the robustness of the observed gene-environment interplay in substance use.