A new study reveals the APOE2 gene, known as a 'longevity gene,' may protect the brain from Alzheimer's disease by enhancing DNA repair in neurons. Researchers at the Buck Institute for Research on Aging used human stem cell-derived brain cells to discover that APOE2 helps neurons repair DNA damage and resist cellular senescence. In contrast, the APOE4 variant, linked to higher Alzheimer's risk, made brain cells more fragile.
Senior author Lisa M. Ellerby expressed surprise that the protective mechanism involves DNA repair, not just cholesterol transport. The findings, supported by mouse studies, suggest future treatments could simulate APOE2's effects. Experts at the Alzheimer's Association and Columbia University call the study exciting, shifting focus to brain resilience and aging.
Limitations include the laboratory setting, not living patients. Researchers advise healthy lifestyle choices like exercise and sleep to support brain health regardless of APOE variant.