Influence of the COMT genotype on working memory and brain activity changes during development
Iroise Dumontheil1, Chantal Roggeman, Tim Ziermans
1Neuroscience Department, Karolinska Institutet, Retzius väg 8, Stockholm, Sweden. i.dumontheil@gmail.com
Biological Psychiatry
|April 26, 2011
Summary
The COMT Val158Met gene polymorphism impacts working memory (WM) differently across development. Met allele benefits emerge after age 10, influencing brain activity and cognitive performance in developing individuals.
Area of Science:
- Neuroscience
- Genetics
- Developmental Psychology
Background:
- The COMT Val158Met polymorphism influences dopamine levels and working memory (WM) performance in adults.
- Met allele carriers show reduced prefrontal cortex activation during WM tasks.
- Dopaminergic system maturation during adolescence may alter Met allele effects.
Purpose of the Study:
- To investigate the association between COMT genotype and visuospatial WM.
- To examine developmental changes in COMT genotype effects on WM behavior and brain activity.
- To analyze age × genotype interactions in a typically developing sample.
Main Methods:
- Cross-sectional and longitudinal study of 322 participants aged 6-20 years.
- Behavioral assessment of visuospatial working memory.
- Magnetic resonance imaging (MRI) to analyze brain activity and structure.
Main Results:
- Visuospatial WM capacity showed an age × genotype interaction; Met allele benefits appeared after age 10.
- WM-related activation in the inferior frontal gyrus and IPS exhibited age × genotype interactions.
- Val/Val genotype was associated with greater bilateral IPS gray matter volume and right IPS activation.
Conclusions:
- COMT genotype effects on WM are dynamic during development, not static.
- Developmental trajectories of WM are influenced by COMT genotype.
- Understanding these developmental changes is crucial for studying genetic impacts on cognition in health and disease.
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