A microdeletion (95kb) was associated with impaired gait, delayed motor and language development, low IQ and mild dysmorphism, whereas a larger deletion (202 kb), affecting partially both FGF14 and ITGBL1, was associated with ataxia exacerbated by fever, but with normal IQ [4, 9]. The gene discussed is FGF14; the disease is cerebellar ataxia.