KCNQ1 and autosomal dominant cerebellar ataxia: Based on the same cohort, we found in the present study that one significant variant rs77741796 near PTPRQ gene and eight suggestive significant variants at KCNQ1/FER/PJA2/ITGA9/EPHA6 genes were associated with SCA among PWH under 45 years old (Table 2).