ATXN7 and dentatorubral-pallidoluysian atrophy: The most common types of SCAs worldwide include SCA1, SCA2, SCA3, SCA6, SCA7, and dentatorubral-pallidoluysian atrophy (DRPLA), all caused by unstable trinucleotide repeat Cytosine-Adenine-Guanine (CAG) expansions in the coding region of the respective genes [3, 6].