Spinocerebellar ataxia type 6 (SCA6) is one of three allelic autosomal dominant disorders due to mutations of the CACNA1A gene, located on chromosome 19p13; the other two being episodic ataxia type 2 (EA2) and familial hemiplegic migraine (Tarnutzer et al. 2024). This evidence concerns the gene CACNA1A and spinocerebellar ataxia type 6.