Exploring Phenotypic and Genetic Overlap Between Cannabis Use and Schizotypy

Area of Science:

• Psychiatry
• Genetics
• Neuroscience

Background:

• A known link exists between cannabis use and psychosis, but its precise nature is unclear.
• Previous research identified genetic overlap between schizophrenia and cannabis use.
• This study investigates the relationship between subclinical psychosis (schizotypy) and cannabis use.

Purpose of the Study:

• To examine genetic overlap between schizotypy and cannabis use.
• To investigate the phenotypic association between schizotypy and cannabis use.
• To explore the biological mechanisms underlying the cannabis-psychosis association.

Main Methods:

• Phenotypic correlations were calculated for schizotypy and cannabis phenotypes using UK Biobank data.
• Single nucleotide polymorphism (SNP)-based heritability and genetic correlations were estimated.
• Data from recent genome-wide association studies were also analyzed.

Main Results:

• A robust positive phenotypic association was found between most schizotypy and cannabis use phenotypes (correlation range .05-.18).
• Significant SNP-based heritability was observed for social anhedonia and unreal visions.
• A negative genetic correlation was found between social anhedonia and frequency of cannabis use (rg = -.30).

Conclusions:

• The relationship between cannabis use and psychosis extends to subclinical symptoms.
• Genetic and phenotypic associations suggest a complex interplay between schizotypy and cannabis use.
• Further research with larger sample sizes is required to elucidate the biological underpinnings.