Genetic Factors in Cannabinoid Use and Dependence

Area of Science:

• Genetics
• Psychiatry
• Cannabinoid Research

Background:

• Cannabinoid use and dependence are heritable, yet specific genetic contributors remain largely unknown.
• Despite widespread use, identifying genes linked to problematic cannabis use and dependence has been challenging.

Purpose of the Study:

• To review genetic studies investigating the heritability of cannabis use and dependence.
• To identify gaps in current research and propose future directions for genetic discovery.

Main Methods:

• Review of human candidate gene association studies, family-based linkage studies, and genome-wide association studies.
• Analysis of findings from the last two decades concerning genetic risk factors for cannabis use.

Main Results:

• Existing studies show limited overlap and low reproducibility, potentially due to small sample sizes and ascertainment bias.
• Recent large-scale studies indicate the genetic architecture of cannabis use involves many small-effect genes, similar to other substance use disorders and psychiatric conditions.

Conclusions:

• Increasing sample sizes and targeted recruitment are crucial for identifying more genes associated with cannabinoid use and dependence.
• Further investigation in preclinical models is needed to understand the genetic architecture and risk factors for problematic cannabis use.