In the present study, the polymorphic distribution of HAMP rs10421768 genotypes AA, AG and GG among SCA patients was 64.4%, 33.3%, and 2.2% respectively, whereas in the healthy controls, the AA, AG and GG genotypic frequencies were 86.7%,13.3% and 0% respectively. Here, HAMP is linked to autosomal dominant cerebellar ataxia.