Alzheimer’s disease, Lewy body dementia, and Parkinson’s disease are often caused by the formation of fibrillar aggregated proteins (amyloid fibrils) of amyloid beta (Aβ), Tau (identified in Alzheimer’s disease patients), and α-synuclein (αSyn; identified in cases of Lewy body dementia and Parkinson’s disease) [1,2,3,4,5,6]. The gene discussed is MAPT; the disease is Parkinson disease.