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Causal effect analysis of the relationship between Alzheimer's diseas (AD) and wet age-related macular degeneration

Weili Zhang1, Qinying Huang1, Jinying Li1

  • 1Department of Ophthalmology, Peking University Shenzhen Hospital, Shenzhen, Guangdong, China.

European Journal of Ophthalmology
|March 3, 2025
PubMed

Insights

This study investigated the link between Alzheimer's disease (AD) and wet age-related macular degeneration (wAMD). Findings suggest AD may offer a protective effect against developing wAMD, warranting further research into their interaction.

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Genetics

Background:

  • Alzheimer's disease (AD) and wet age-related macular degeneration (wAMD) are common neurodegenerative and ophthalmological conditions in older adults.
  • The causal relationship between AD and wAMD remains largely unexplored.
  • Understanding potential links is crucial for geriatric health and disease management.

Purpose of the Study:

  • To investigate the potential causal relationship between Alzheimer's disease and wet age-related macular degeneration.
  • To utilize Mendelian randomization analysis to assess the association between AD and wAMD.

Main Methods:

  • Mendelian randomization analysis using summary statistics from the IEU Open GWAS database.
  • Genetic data for AD (3899 cases, 214,893 controls) and wAMD (2114 cases, 206,601 controls) were analyzed.
  • Inverse-variance weighted (IVW) method was the primary analysis, supported by sensitivity analyses and Steiger testing.

Main Results:

  • A statistically significant association was found between wAMD and a decreased risk of AD.
  • The IVW analysis indicated an odds ratio (OR) of 0.82 (95% CI: 0.77-0.88, p=1.67E-09) for AD in the presence of wAMD.
  • This suggests a protective effect of AD against wAMD development.

Conclusions:

  • The study indicates a potential protective role of Alzheimer's disease in the development of wet age-related macular degeneration.
  • These findings highlight a possible interaction between AD and wAMD.
  • Further research is recommended to explore the biological mechanisms underlying the observed association.
Keywords:
Alzheimer's diseaseDegenerative diseasesMendelian randomizationwet age-related macular degeneration

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