SMOC1 is almost exclusively expressed in OPCs and OLs in the brain (Single cell type - SMOC1 - The Human Protein Atlas https://www.proteinatlas.org/ENSG00000198732-SMOC1/single+cell+type) and has been implicated in the failure of oligodendrogenesis in Spinocerebellar Ataxia [9]. This evidence concerns the gene SMOC1 and cerebellar ataxia.