Your APOE status is the single most important common genetic risk factor for late-onset Alzheimer's disease.
The apolipoprotein E gene governs how your brain clears beta-amyloid and how your liver processes lipoproteins. The same gene, two critical systems.
The Biology
The apolipoprotein E gene produces a protein that plays a central role in how your brain clears beta-amyloid. The protein fragment that accumulates into the plaques characteristic of Alzheimer's disease. APOE also governs how your liver processes cholesterol and lipoproteins. The same gene that affects your cardiovascular lipid metabolism is also a master regulator of your brain's waste-clearance system.
What Varia Analyzes
APOE status is determined by two SNPs read together. Rs429358 (codon 112) and rs7412 (codon 158). Neither SNP alone is sufficient. Your combination of alleles at both positions determines which APOE isoforms you carry: ε2, ε3, or ε4. Varia reads both positions from your raw file and resolves your complete APOE diplotype. Something 23andMe cannot do due to FDA restrictions on APOE reporting, and something AncestryDNA chip files may not report accurately. The ApoE4.Info community has documented since 2006, across thousands of user reports, that AncestryDNA raw data consistently reports rs429358 as T/T even in individuals confirmed as ε3/ε4 or ε4/ε4 by other platforms.
Why It Matters
The ε4 allele is present in approximately 25% of people of European descent but accounts for roughly 50% of Alzheimer's disease cases. Carrying one ε4 allele is associated with 3–4x elevated lifetime risk; carrying two is associated with 8–12x elevated risk compared to the most common ε3/ε3 configuration. This is not a deterministic finding. Many ε4/ε4 carriers never develop Alzheimer's. But it is the strongest common genetic risk signal in medicine and warrants proactive engagement with a neurologist or longevity medicine specialist familiar with APOE4 management strategies.
Key sources
- Corder EH, et al. Gene dose of apolipoprotein E type 4 allele and the risk of Alzheimer's disease. Science. 1993.
- Farrer LA, et al. Effects of age, sex, and ethnicity on the association between APOE genotype and Alzheimer disease. JAMA. 1997.
- Liu CC, et al. Apolipoprotein E and Alzheimer disease: risk, mechanisms and therapy. Nat Rev Neurol. 2013.
- Yamazaki Y, et al. Apolipoprotein E and Alzheimer disease: pathobiology and targeting strategies. Nat Rev Neurol. 2019.