One of the most potent individual genes yet discovered is related to cholesterol metabolism, glucose metabolism—and Alzheimer’s disease risk. You may have heard of this gene, which is called APOE, because of its known effect on Alzheimer’s disease risk. It codes for a protein called APOE (apolipoprotein E) that is involved in cholesterol transport and processing, and it has three variants: e2, e3, and e4. Of these, e3 is the most common by far, but having one or two copies of the e4 variant seems to multiply one’s risk of developing Alzheimer’s disease by a factor of between two and twelve.
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