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Related Experiment Videos

Apolipoprotein E polymorphism and Alzheimer's disease

J Poirier1, J Davignon, D Bouthillier

  • 1McGill Centre for Studies in Aging, Douglas Hospital Research Centre, Verdun, Quebec, Canada.

Lancet (London, England)
|September 18, 1993
PubMed
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The apolipoprotein E (apoE) epsilon 4 allele is linked to a higher risk of developing sporadic Alzheimer's disease (AD). This association is stronger in women and may indicate earlier disease onset.

Area of Science:

  • Neuroscience
  • Genetics
  • Biochemistry

Background:

  • Apolipoprotein E (apoE) is implicated in Alzheimer's disease (AD) pathology, including neurofibrillary tangles and amyloid plaques.
  • The apoE gene is located on chromosome 19, a region associated with late-onset familial AD.
  • Lipid redistribution in the brain following neurodegeneration involves apoE.

Purpose of the Study:

  • To investigate the association between apoE phenotype expression and allele frequencies (epsilon 2, epsilon 3, epsilon 4) in sporadic Alzheimer's disease (AD).
  • To determine if apoE genotype influences the age of AD onset.
  • To examine gender-specific differences in the apoE-AD association.

Main Methods:

  • Studied apoE phenotype expression and allele frequencies in 91 patients with sporadic AD and 74 controls.

Related Experiment Videos

  • Compared allele frequencies (epsilon 2, epsilon 3, epsilon 4) between AD patients and control groups.
  • Analyzed the relationship between apoE genotype and age of disease onset, as well as gender.

    • Main Results:

    • A significant association was found between the apoE epsilon 4 allele and sporadic AD (frequency 0.380 in AD vs. 0.122 in controls, p < 0.01).
    • Individuals with the epsilon 4 allele tended to develop AD earlier than those with epsilon 3 or epsilon 2.
    • The epsilon 4 association with AD was more pronounced in women, and octogenarians with AD showed a significantly higher epsilon 4 frequency.

    Conclusions:

    • Apolipoprotein E epsilon 4 is a significant susceptibility factor in the aetiopathology of sporadic Alzheimer's disease.
    • The findings highlight the role of apoE genotype in AD risk and potentially in disease progression.
    • Further research into apoE's role could lead to targeted prevention or treatment strategies for AD.