However, the recurrent identification of FGF14 expansions in patients with DBN plus additional isolated cerebellar ocular motor signs but without overt ataxia despite disease duration of up to 16 years raises the possibility that GAA-FGF14 disease may remain limited to the cerebellar ocular motor system without broader cerebellar involvement in a subset of patients. This evidence concerns the gene FGF14 and Ataxia.