Many families know the quiet fear that comes with memory loss. Questions often arise about why some people are affected while others are not, and the answer has long remained unclear.
New research is now pointing toward a shared biological explanation that could account for a large proportion of cases.
A genetic thread
A team from University College London examined data from roughly 450,000 people, using a mix of population studies, brain imaging and post-mortem analysis. According to their findings, published in npj Dementia, a gene called APOE appears to play a central role.
Everyone carries this gene, but it comes in different forms. Earlier research highlighted one variant as particularly risky, yet this new analysis suggests that more than one version may contribute to Alzheimer’s development.
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Together, these variants may be linked to a substantial share of cases, indicating a broader genetic influence than previously recognised.
More than destiny
Even so, genetics does not seal a person’s fate. The researchers note that many people with higher genetic risk never develop Alzheimer’s.
Instead, a combination of factors appears to shape outcomes. Lifestyle, environment and overall health can all interact with genetic predisposition, influencing whether the disease emerges.
There is growing evidence that a meaningful number of dementia cases could be delayed or prevented through everyday choices.
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What can be done
While future treatments may target genetic pathways, prevention still depends on modifiable habits. Key areas include:
- Heart health
- Mental and social activity
- Managing chronic conditions
- Avoiding smoking and heavy alcohol use
The findings suggest Alzheimer’s develops through a mix of biology and behavior, not a single cause.
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