AD, progressive supranuclear palsy, corticobasal degeneration, argyrophilic grain disease, Pick’s disease, frontotemporal dementia with parkinsonism linked to chromosome 17 (FTDP-17), Niemann–Pick disease type C, and chronic traumatic encephalopathy are collectively known as tauopathies as they have common characteristics such as the pathological tau accumulation [4,5]. The gene discussed is MAPT; the disease is Alzheimer disease.