Circulating vitamin E levels and Alzheimer's disease: a Mendelian randomization study

Area of Science:

• Nutritional Neuroscience
• Neurodegenerative Diseases
• Human Genetics

Background:

• Alzheimer's disease (AD) is the primary cause of dementia in the elderly.
• Vitamin E has long been recognized for its importance in neurological health.
• Previous clinical studies on vitamin E and AD risk have produced conflicting results, leaving the genetic association unclear.

Purpose of the Study:

• To investigate the potential genetic association between circulating vitamin E levels and the risk of developing Alzheimer's disease.
• To clarify the role of vitamin E in AD pathogenesis using a robust genetic approach.

Main Methods:

• A Mendelian randomization study was conducted.
• Utilized large-scale genome-wide association study datasets for vitamin E (N=7781) and Alzheimer's disease (N=54,162) in European populations.
• Employed statistical methods including Mendelian randomization-Egger intercept, inverse-variance weighted, and weighted median analyses to assess pleiotropy and association.

Main Results:

• The Mendelian randomization-Egger intercept test indicated no significant pleiotropy (p=0.296).
• Inverse-variance weighted analysis showed no significant association between vitamin E and AD (OR=0.96, p=0.936).
• Weighted median analysis also found no significant association (OR=1.13, p=0.836).

Conclusions:

• Circulating vitamin E levels are not significantly genetically associated with Alzheimer's disease risk.
• Findings suggest that vitamin E supplementation may not be effective in preventing Alzheimer's disease in the general population.
• Further research may be needed to explore other potential interventions for AD prevention.