Almost All People With Two Copies of This Genetic Variant Develop Signs of Alzheimer's Disease, Study Finds
Almost all people with two copies of a genetic variant called APOE4 show signs of Alzheimer’s disease, according to a new study of people predominantly of European ancestry. The findings suggest that people with two copies of the gene—who are called APOE4 homozygotes—have a distinct genetic form of Alzheimer’s.