FGF14 and cerebellar ataxia: Cerebellar features with gait and limb ataxia, nystagmus (gaze-evoked or vertical) and dysarthria are reported in variable proportion in all cases of FGF14 deletion [3–5, 7, 8, 11–13]: 75% (24/32) have nystagmus, 46% (15/32) ataxia, of which half (7/32, 21%) are episodic.