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Age-related decline in brain resources modulates genetic effects on cognitive functioning
Ulman Lindenberger1, Irene E Nagel, Christian Chicherio
1Max Planck Institute for Human Development Berlin, Germany.
Frontiers in Neuroscience
|February 20, 2009
Summary
Common genetic variations significantly impact cognitive performance in aging. As brain resources decline, genetic differences become more pronounced, increasing cognitive variability in older adults.
Area of Science:
- Neuroscience
- Genetics
- Cognitive Aging
Background:
- Cognitive performance varies significantly across adulthood, increasing in heterogeneity with age.
- Normal aging involves declines in neurochemical and anatomical brain resources.
- Genetic factors are known to influence cognitive function, but their interaction with aging brain changes is complex.
Purpose of the Study:
- To investigate how age-related changes in brain resources modulate the effects of common genetic variations on cognitive functioning.
- To test the hypothesis that genetic influences on cognition are amplified as brain resources diminish.
Main Methods:
- The study posits a nonlinear relationship between brain resources and cognition.
- It draws upon existing research (Nagel et al., 2008) examining genetic polymorphisms like Catechol-O-Methyltransferase (COMT) and Brain-Derived Neurotrophic Factor (BDNF).
Main Results:
- Empirical evidence suggests that the impact of the COMT gene on cognitive performance is magnified in older adults.
- Gene-gene interactions, such as between COMT and BDNF, further influence cognitive outcomes in aging.
Conclusions:
- Common genetic polymorphisms contribute to the increasing heterogeneity of cognitive functioning observed in late adulthood.
- The findings support the hypothesis that diminishing brain resources exacerbate genetic influences on cognition.
- The framework may extend to other genetic polymorphisms influencing cognitive aging.
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