SNCA and Parkinson disease: Among SNCA-linked diseases and disorders, PD, Alzheimer’s disease (AD), tauopathy, degenerative dementia, progressive motor neuropathy, familial encephalopathy, hereditary and motor neuropathies, a disorder of basal ganglia, movement disorders, neuromuscular diseases, and other progressive neurological diseases were found to be the major diseases and disorders linked to SNCA gene.