CACNA1A and spinocerebellar ataxia type 6: Interestingly, this analysis revealed that the coverage and the genotyping quality for coding RED loci were good (>20×) across all genes, with the exception of CACNA1A, ATXN2 and HTT, which cause spinocerebellar ataxia 2, spinocerebellar ataxia 6 and Huntington disease, respectively.