Myths vs facts: APOE and Fruchtbarkeit

Claims that APOE gene variants (ε2, ε3, ε4) directly and clinically affect fertility are not well supported by evidence. APOE is primarily known for its role in lipid metabolism and is associated with Alzheimer's and cardiovascular risk. Some studies have explored links to oocyte quality or IVF outcomes, but results are inconsistent and effect sizes are small. The evidence is mostly based on mechanistic plausibility (e.g., cholesterol's role in steroid hormone synthesis) rather than robust clinical trials. Direct causal evidence is lacking. Commercial DNA tests that claim APOE influences fertility often overstate the science. For fertility assessment, established markers like hormone panels, AMH, or semen analysis are far more informative. APOE genotyping should not be used for family planning decisions.