Dementia Is Everywhere.

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29. Alzheimer's Disease Genetics Fact Sheet ...National Institute on Aging

Genes and Alzheimer's disease
If My Parent Has Alzheimer's, Will I Have it Too? Infographic. Click to open page and access pdf
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In most cases, Alzheimer’s does not have a single genetic cause. Instead, it can be influenced by multiple genes in combination with lifestyle and environmental factors. Consequently, a person may carry more than one genetic variant or group of variants that can either increase or reduce the risk of Alzheimer’s.

Importantly, people who develop Alzheimer’s do not always have a history of the disease in their families. Still, those who have a parent or sibling diagnosed with the disease have a higher risk of developing Alzheimer’s than those without that association.

Genetic variants that affect Alzheimer's disease risk
In 2010, we knew of just 10 genetic areas associated with Alzheimer’s. Today, thanks in large part to the work of NIH-funded researchers, we know of at least 80 genetic areas associated with this disease. Understanding which genes play a role — and what role they play — may help identify new methods to prevent, delay, or treat dementia.

One well-known gene that influences Alzheimer’s risk is the apolipoprotein E (APOE) gene. The APOE gene is involved in making a protein that helps carry cholesterol and other types of fat in the bloodstream. Problems in this process are thought to contribute to the development of Alzheimer’s. APOE comes in several forms, called alleles (e.g., ε2, ε3).