FGF14 and cerebellar ataxia: Dominantly inherited GAA repeat expansions in the first intron of the fibroblast growth factor 14 gene (FGF14) have recently been reported as a common cause of LOCA (GAA-FGF14 ataxia; spinocerebellar ataxia 27B [MIM: 620174]), accounting for 10 to 61% of unsolved cases in various cohorts5, 6.