KCND3 and autosomal dominant cerebellar ataxia: These 20 LP/P variants provided a genetic diagnosis for 22 patients (6.3%) and were located in 12 different SCA genes, with the most prevalent genes being KCNC3/SCA13 (4 diagnoses), CACNA1A/SCA6 (4 diagnoses), KCND3/SCA19/22 (3 diagnoses) and 9 other SCA genes in which LP/P variants were identified (one or two diagnoses each) (Table 2).