Dominantly inherited GAA repeat expansions in intron 1 of the fibroblast growth factor 14 (FGF14) gene have recently been shown to be a common cause of adult-onset ataxia (GAA-FGF14 ataxia; spinocerebellar ataxia 27B) in European and South Asian populations.1,2 Patients with GAA-FGF14 ataxia displayed a slowly progressive cerebellar syndrome with frequent episodic symptoms and downbeat nystagmus.1,2. This evidence concerns the gene FGF14 and cerebellar ataxia.