Genetically, HD is caused by an autosomal inherited cytosine‐adenine‐guanine (CAG) trinucleotide repeat length expansion in the human huntingtin (HTT) gene located on the short arm of chromosome 4, at position 16.3 and encodes for a protein of 3144 amino acids, with a molecular weight of 350 kDa [2, 3]. Here, HTT is linked to Huntington disease.