Alzheimer’s Genetics study reveals 48 new Risk Regions and Clues to Brain disease | #alzheimer’s disease genetics # Alzheimer’s genetic risk loci # 48 new Alzheimer’s risk loci # Nature Alzheimer’s study 2026 # Alzheimer’s disease research # microglia and Alzheimer’s # neuronal dysfunction # Alzheimer’s heritability # polygenic risk scores # Alzheimer’s drug targets # genome-wide association study # dementia genetics # Alzheimer’s genetic discoveries