Spinocerebellar Ataxia 15, also known as sca15, is related to spinocerebellar ataxia type 15/16 and spinocerebellar ataxia 29, and has symptoms including cerebellar ataxia, action tremor and static tremor. An important gene associated with Spinocerebellar Ataxia 15 is ITPR1 (Inositol 1,4,5-Trisphosphate Receptor Type 1). Affiliated tissues include spinal cord and cerebellum, and related phenotypes are hyperreflexia and dysarthria