Interaction Between Val158Met Catechol-O-Methyltransferase Polymorphism and Social Cognitive Functioning in...

Area of Science:

• Neuroscience
• Psychiatry
• Genetics

Background:

• The catechol-O-methyltransferase (COMT) Val158Met polymorphism is a functional genetic variation.
• COMT enzyme activity is influenced by this polymorphism, potentially affecting neurotransmitter levels.
• Social cognitive deficits are a core feature of schizophrenia.

Purpose of the Study:

• To investigate the association between the COMT Val158Met polymorphism and social cognitive functioning in schizophrenia patients.
• To explore the influence of COMT genotype on specific social cognition domains.

Main Methods:

• 100 schizophrenia patients were genotyped for the COMT Val158Met polymorphism (Val/Val, Met/Met, Val/Met).
• Social cognition was assessed using the Facial Expression Recognition Test, Voice Emotion Recognition Test, and Reading the Mind in the Eyes Test.
• Symptom severity was measured using the Schedule for the Assessment of Negative Symptoms, Schedule for the Assessment of Positive Symptoms, and Beck Depression Inventory.

Main Results:

• Schizophrenia patients with the Val/Val genotype showed significantly poorer performance on social cognitive measures compared to Met/Met and Val/Met genotypes.
• No significant correlation was found between COMT genotype and age at schizophrenia onset.
• In a control group, Met homozygotes demonstrated better performance on cognitive measures.

Conclusions:

• The COMT Val158Met genotype influences social cognitive functioning in schizophrenia.
• Specifically, the Val/Val genotype is associated with social cognitive disadvantages in schizophrenia patients.
• COMT genotype does not appear to be a significant factor in the age of schizophrenia onset.