Mutations of CACNA1A were reported in familial hemiplegic migraine and episodic ataxia type-2, spinocerebellar ataxia type 6 (SCA6), and cognitive impairment, including intellectual disability, autism, epilepsy, and ADHD [87,88,89]. The gene discussed is CACNA1A; the disease is spinocerebellar ataxia type 6.