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