Spinocerebellar Ataxia 50, also known as sca50, is related to autosomal dominant cerebellar ataxia and machado-joseph disease. An important gene associated with Spinocerebellar Ataxia 50 is NPTX1 (Neuronal Pentraxin 1). Affiliated tissues include spinal cord and eye, and related phenotypes are ataxia and nystagmus