The BDNF Val66Met polymorphism moderates the relationship between cognitive reserve and executive function.

Area of Science:

• Neuroscience
• Genetics
• Gerontology

Background:

• Cognitive reserve (CR) explains variations between brain pathology and cognitive function.
• Understanding factors influencing CR is crucial for healthy aging.

Purpose of the Study:

• To investigate the influence of apolipoprotein E (APOE) and brain-derived neurotrophic factor (BDNF) gene variations on the association between CR and cognitive function in healthy older adults.
• To determine the role of BDNF Val66Met polymorphism in moderating the relationship between CR contributors and executive function.

Main Methods:

• Analysis of 433 healthy older adults from the Tasmanian Healthy Brain Project.
• Examination of common polymorphic variations in APOE and BDNF genes.
• Statistical modeling to assess the interaction between CR, genetic factors, and cognitive performance, specifically executive function.

Main Results:

• The BDNF Val66Met polymorphism significantly moderated the association between CR and executive function.
• CR explained 8.5% of executive function variance in BDNF Val homozygotes, but was not a significant predictor in BDNF Met carriers.
• No significant link was found between APOE polymorphisms and the influence of CR on cognitive function.

Conclusions:

• BDNF plays a critical role in the capacity for building or accessing cognitive reserve.
• The BDNF Val66Met genotype influences the effectiveness of cognitive reserve in maintaining executive function in aging individuals.
• Genetic variations, particularly in BDNF, are important considerations in understanding individual differences in cognitive resilience.