COMT Val158Met and cognition: main effects and interaction with educational attainment

Area of Science:

• Neurogenetics
• Cognitive Science
• Anthropology

Background:

• Genetic influence on cognition correlates with socioeconomic status in children.
• The Catechol-O-methyltransferase (COMT) Val158Met polymorphism affects executive functions and working memory.
• The COMT Met allele is linked to efficient prefrontal processing and attention, but also stress vulnerability.

Purpose of the Study:

• To investigate the interaction between COMT Val158Met genotype and years of education in predicting cognitive performance.
• To examine how socioeconomic adversity, indicated by years of education, moderates the effects of COMT genotype on cognition.

Main Methods:

• Administered the Wechsler Adult Intelligence Scale-Revised (WAIS-R) to 328 genotyped Plains American Indians.
• Assessed cognitive performance across measures of long-term memory, working memory, and attention.
• Analyzed the interaction between COMT Val158Met genotype and years of education.

Main Results:

• Significant genotypic effects of COMT Val158Met on memory, working memory, and attention were observed.
• The COMT Met allele was associated with better performance on Information and Picture Completion subscales, with Met/Met homozygotes performing best.
• COMT genotype interacted with years of education, showing that Met allele carriers' cognitive scores improved more with education than Val/Val individuals', with a crossover effect around 11-12 years of education.

Conclusions:

• COMT Val158Met genotype influences multiple cognitive domains in Plains American Indians.
• Educational adversity moderates the cognitive effects of the COMT Val158Met polymorphism, with potential negative impacts in less educated individuals and benefits in more educated ones.