Outline the genetic association of Apolipoprotein E with Alzheimer’s Disease (AD) and describe its function in the brain. What is the likelihood that the patient will develop early onset AD (before 60 years of age

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Outline the genetic association of Apolipoprotein E with Alzheimer’s Disease (AD) and describe its function in the brain. What is the likelihood that the patient will develop early onset AD (before 60 years of age

Last updated 6:37 PM on 5/7/25
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10 Terms

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what question

APOE and Alzheimer’s Disease

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layout

component details

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components

APOE Function
Alleles
Risk Association
Mechanism in AD
Early-Onset AD
Likelihood of Early-Onset
Testing Implication

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APOE Function

Lipid transport, neuronal repair in CNS

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Alleles

ε2 (protective), ε3 (neutral), ε4 (risk)

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Risk Association

ε4/ε4 → 10–15× risk; ε3/ε4 → 2–3× risk

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Mechanism in AD

Promotes amyloid-beta aggregation and reduced clearance

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Early-Onset AD

Usually caused by mutations in APP, PSEN1, or PSEN2—not APOE

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Likelihood of Early-Onset

Low, unless rare high-penetrance mutations are present

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Testing Implication

APOE genotyping gives risk insight, not diagnos