CHRNA7 and Parkinson disease: CHRNA7 has been associated with several neuropsychiatric and behavioral disorders, such as schizophrenia, bipolar disorder, autism, Alzheimer’s disease, Parkinson’s disease, and 15q13.3 microdeletion and duplication syndromes5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15.