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Related Experiment Videos

[Apolipoprotein E gene polymorphisms and Alzheimer disease].

Deng Chen1, Jun-Wu Zhang, Zhen-Xin Zhang

  • 1National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, CAMS & PUMC, Beijing 100005, China.

Yi Chuan Xue Bao = Acta Genetica Sinica
|February 28, 2004
PubMed
Summary

The APOE epsilon 4 allele is linked to a higher risk of Alzheimer's disease (AD) in the Chinese Han population, particularly after age 65. The APOE epsilon 2 allele may offer protection against AD in males.

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Area of Science:

  • Genetics
  • Neuroscience
  • Epidemiology

Context:

  • Alzheimer's disease (AD) is a progressive neurodegenerative disorder.
  • The apolipoprotein E (APOE) gene is a known genetic risk factor for late-onset AD.
  • Understanding APOE allele and genotype distributions is crucial for assessing AD risk in diverse populations.

Purpose:

  • To investigate the association between APOE alleles/genotypes and sporadic Alzheimer's disease in the Chinese Han population.
  • To determine if APOE polymorphism influences dementia severity or sex-specific risk.
  • To identify potential protective effects of specific APOE alleles.

Summary:

  • PCR-RFLP analysis revealed significantly higher frequencies of the APOE epsilon 4 allele in AD patients (23.1%) compared to controls (7.4%), indicating a strong association with AD risk (OR=3.82).

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  • APOE epsilon 4 carriers showed a 5.38-fold increased probability of developing AD after age 65, suggesting an age-dependent interaction.
  • No significant association was found between APOE polymorphism and dementia severity. The APOE epsilon 2 allele was less frequent in male AD patients, suggesting a potential protective role in this subgroup.

    • Impact:

    • This study highlights the significant role of the APOE epsilon 4 allele as a risk factor for Alzheimer's disease in the Chinese Han population.
    • Findings suggest potential age-related modulation of AD risk by APOE epsilon 4 and a possible protective effect of APOE epsilon 2 in males.
    • Results contribute to a better understanding of the genetic architecture of AD in East Asian populations and inform future research directions.