Science Friday How One Gene Affects Alzheimer’s Risk
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Feb 25, 2026 Dylan Williams, a molecular and genetic epidemiologist at UCL who studies APOE and Alzheimer’s risk. He outlines APOE’s role in lipid transport and its three variants. He explains how much APOE contributes to cases, its population impact, links to plaques and symptoms, and prospects for APOE-targeted therapies and screening guidance.
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APOE Variants Strongly Shift Alzheimer's Risk
- APOE (apolipoprotein E) has three inherited forms E2, E3, and E4 that strongly influence Alzheimer's risk.
- Dylan Williams explains E2 is low risk, E3 medium, and E4 high, and APOE shuttles fat and has diverse brain roles.
APOE Could Account For Most Alzheimer's Cases
- Removing effects of APOE E3 and E4 could prevent roughly 70–90% of Alzheimer's cases in studied populations.
- Williams emphasizes this magnitude is far larger than any single other known Alzheimer's gene effect.
APOE Impact Varies By Population And Other Factors
- APOE effects may differ across ethnic groups and are modified by other genetic and environmental factors.
- Williams notes even APOE4 homozygotes have ~60% lifetime risk, so ~40% never develop Alzheimer's, implying other modifiers matter.