An association study between catechol-O-methyl transferase gene polymorphism and methamphetamine psychotic disorder

Area of Science:

• Neuroscience
• Psychiatry
• Genetics

Background:

• Methamphetamine psychosis presents with transient or prolonged courses, and spontaneous relapse can occur without re-exposure.
• Central dopaminergic neurotransmission dysfunction is implicated in these psychiatric states.
• Catechol-O-methyl transferase (COMT) plays a key role in regulating synaptic dopaminergic activity.

Purpose of the Study:

• To investigate the association between a functional polymorphism in the catechol-O-methyl transferase (COMT) gene and the development of methamphetamine psychosis.
• To explore the role of COMT gene variations in transient, prolonged, and spontaneous relapse types of methamphetamine psychosis.

Main Methods:

• Genotyping of the val 158 met functional polymorphism in the catechol-O-methyl transferase (COMT) gene.
• Study included 143 Japanese patients with methamphetamine psychosis and 200 healthy controls.
• Patients were categorized into subgroups based on distinct clinical features.

Main Results:

• A significant difference in catechol-O-methyl transferase (COMT) allele frequency was observed between patients with spontaneous relapse and controls (P=0.018).
• Patients experiencing spontaneous relapse had a nearly 1.7-fold higher frequency of the low-activity met allele compared to controls.
• The met allele of COMT was significantly associated with methamphetamine psychosis and spontaneous relapse.

Conclusions:

• The met allele of the catechol-O-methyl transferase (COMT) gene is associated with methamphetamine psychosis, particularly in cases involving spontaneous relapse.
• Individuals carrying the met allele may be at an elevated risk for adverse responses to methamphetamine.
• Findings suggest a genetic predisposition, via COMT polymorphism, to specific clinical courses of methamphetamine-induced psychiatric states.