Cerebellar Ataxia Type 9, also known as sca9, is related to spinocerebellar ataxia 9 and x-linked cerebellar ataxia. An important gene associated with Cerebellar Ataxia Type 9 is PLEKHG4 (Pleckstrin Homology And RhoGEF Domain Containing G4). Affiliated tissues include brain and salivary gland.