Impulsivity facets and substance use involvement: insights from genomic structural equation modeling.

Area of Science:

• Behavioral Genetics
• Psychiatric Genetics
• Addiction Research

Background:

• Impulsivity is a multidimensional trait linked to substance use disorders (SUDs).
• The precise genetic relationships between specific impulsivity facets and different stages of substance involvement are not well understood.

Purpose of the Study:

• To investigate the shared genetic architecture between nine impulsivity traits and seven substance use (SU) and SUD traits.
• To identify which specific impulsivity facets are genetically associated with different stages of substance use and SUDs.

Main Methods:

• Utilized genomic structural equation modeling and genome-wide association studies (GWAS) with a large sample size (N=79,729-903,147).
• Examined the latent genetic correlations and independent genetic associations between impulsivity traits and SU/SUD factors.

Main Results:

• Substance use (SU) and SUD factors showed strong genetic correlation (r=0.77).
• Different impulsivity facets exhibited varying genetic associations: lack of premeditation, negative urgency, and positive urgency were linked to both SU and SUDs.
• Sensation seeking showed stronger genetic correlation with SU, while delay discounting was more strongly linked to SUDs. After controlling for genetic overlap, specific independent genetic associations emerged for each impulsivity facet with SU or SUD factors.

Conclusions:

• Specific facets of impulsivity confer distinct genetic risks for different stages of substance use involvement.
• These findings have significant implications for developing targeted prevention and treatment strategies for substance use disorders.