Dementia remains a critical and under-recognized complication in type 2 diabetes, with substantial genetic contribution. At the European Association for the Study of Diabetes (EASD) 2025, data from 39,379 participants with type 2 diabetes in the United Kingdom Biobank were analyzed to investigate genetic determinants of dementia. 

Over a mean follow-up of 9 years, 1,380 individuals developed dementia, including 529 cases of Alzheimer’s disease and 450 cases of vascular dementia. Genome-wide association analyses identified nine loci linked to all-cause dementia, including six near apolipoprotein E (APOE) on chromosome 19, with additional variants on chromosomes 1, 12, and 14. Gene-set analyses highlighted amino acid metabolic pathways enriched in the hippocampus and carbohydrate metabolism pathways in basal ganglia regions. 

A polygenic risk score derived from these loci demonstrated that individuals with higher scores had a nearly two-fold increased risk of developing dementia (hazard ratio 1.97, 95 percent confidence interval 1.75–2.21). These findings advance understanding of the genetic architecture underlying type 2 diabetes-associated dementia and provide a practical tool for early identification of high-risk patients, enabling proactive monitoring and preventive strategies.