GAD1 and cerebellar ataxia: Among sporadic ataxias, following etiologies were reported (numbers in brackets represent percentage out of total sporadic cases): gluten ataxia (25%), genetic cause (13%, without family history), alcohol-related (12%), multiple system atrophy-cerebellar type (11%), myoclonic ataxia (3%), paraneoplastic cerebellar ataxia (3%), anti-GAD-associated ataxia (2%), phenytoin-related (2%), cerebellitis (1%), superficial siderosis (1%), opsoclonus-myoclonus ataxia, episodic ataxia (negative genetics), ataxia with palatal tremor, HIV-related, and Wernicke’s disease (each <1%) [2].