ATXN2 and amyotrophic lateral sclerosis: Intermediate repeat sizes between 27 and 31 units that contain interspersed CAA interruptions in ATXN2 are associated with the risk for other neurodegenerative diseases like Amyotrophic lateral sclerosis (ALS), Frontotemporal dementia (FTD), and Levodopa-responsive idiopathic Parkinson’s disease (PD) [5, 20–24].