Tau aggregation is not unique to AD; in fact, tau aggregation accounts for more than 20 neurological disorders known as tauopathies, which include AD, frontotemporal dementia with parkinsonism-17 (FTD-17), progressive supranuclear palsy (PSP), corticobasal degeneration, chronic traumatic encephalopathy, and Parkinson’s disease (PD) [59]. The gene discussed is MAPT; the disease is Parkinson disease.