ATXN2 and Rare hereditary ataxia: However, changes in several other genes have been suggested as causes for recessive neurological/neurodegenerative disorders that may include PD: hereditary ataxias (ATXN2/3, FMR1), frontotemporal dementia (e.g. MAPT) and others (e.g. ATP13A2, PLA2G6, FBXO7) [39].