APOE4 gene linked to Alzheimer's risk and vascular health

Recent research highlights the complex role of the APOE4 gene in the development of late-onset Alzheimer's disease, emphasizing that genetic risk cannot be understood by looking at variants in isolation.

A study published in ‘Nature Genetics’, involving participation from the Ace Alzheimer Center Barcelona, analyzed data from hundreds of thousands of individuals to determine how different APOE profiles influence disease risk. Researchers found that certain genetic signals have varying effects depending on whether a person carries the APOE2, APOE3, or APOE4 variant. For instance, a variant near the DDHD1 gene was associated with a lower risk of Alzheimer's specifically among APOE4 carriers.

Beyond direct neuronal impact, the APOE4 variant is linked to vascular complications. Research indicates that the gene affects lipid metabolism and the behavior of pericytes—cells that support brain capillaries. In the presence of the E4 isoform, pericytes may take on characteristics of myofibroblasts, leading to thickened capillary walls and increased amyloid deposition. This suggests that maintaining arterial health in midlife may serve as a preventive measure against future cognitive decline.