The percentage of polymorphic loci (PPL) varied from 100% in RAU, COE, GUA, MCA, STO, YAP, RCO and HCM to 96.8% in SCA, and the mean expected heterozygosity (HE) ranged from 0.449% in HCM to 0.395% in the sample of SCA. This evidence concerns the gene NSD1 and autosomal dominant cerebellar ataxia.