FGF14 and late-onset spinocerebellar ataxia 27b: Furthermore, more recently, GAA expansions in the first intron of FGF14 have been associated with spinocerebellar ataxia 27B (SCA27B, MIM #620174), a new form of autosomal-dominant SCA representing one of the most common genetic causes of adult-onset ataxia in several populations (Pellerin et al. 2024; Satolli et al. 2024).