Spinocerebellar Ataxia, X-Linked 4, also known as scax4, is related to spinocerebellar ataxia, x-linked 5 and spinocerebellar ataxia 18. An important gene associated with Spinocerebellar Ataxia, X-Linked 4 is ATP2B3 (ATPase Plasma Membrane Ca2+ Transporting 3), and among its related pathways/superpathways are CREB Pathway and Response to elevated platelet cytosolic Ca2+. Related phenotypes are progressive cerebellar ataxia and abnormal pyramidal sign