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Interaction between COMT haplotypes and cannabis in schizophrenia: a case-only study in two samples from Spain
Javier Costas1, Julio Sanjuán, Ramón Ramos-Ríos
1Fundación Pública Galega de Medicina Xenómica-SERGAS, Complexo Hospitalario Universitario de Santiago, Santiago de Compostela, Spain. javier.costas@usc.es
Schizophrenia Research
|February 12, 2011
Summary
Cannabis use increases schizophrenia risk, particularly with specific COMT gene variants. Individuals with low-activity COMT variants showed a higher likelihood of cannabis use, suggesting a gene-environment interaction in schizophrenia development.
Area of Science:
- Neuroscience
- Psychiatry
- Genetics
Background:
- Cannabis use is a known environmental risk factor for schizophrenia.
- Genetic susceptibility, particularly involving the COMT gene, may mediate this risk.
- Previous research on the COMT-cannabis interaction in schizophrenia is limited.
Purpose of the Study:
- To investigate the potential interaction between COMT gene polymorphisms and cannabis use in schizophrenia.
- To analyze the association between specific COMT functional haplotypes and cannabis use in schizophrenia patients.
Main Methods:
- A case-only study design was employed using two Spanish patient samples.
- Cannabis use was assessed, and five single nucleotide polymorphisms (SNPs) in the COMT gene were genotyped.
- Association analyses were performed at the SNP, haplotype, and genotype levels.
Main Results:
- A significant association was detected between cannabis use and low-activity COMT variants (P<0.01).
- Schizophrenia patients homozygous for the Met allele at rs4680 had a doubled probability of lifetime cannabis use (OR=2.07).
- Findings were consistent across both study samples and contrasted with previous research.
Conclusions:
- COMT gene polymorphisms appear to be involved in the association between cannabis use and schizophrenia.
- The study suggests a gene-environment interaction, potentially mediated by additional factors.
- Further research is required to confirm the COMT-cannabis interaction and its mechanisms.
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