ATN1 and Huntington disease: Other hereditary disorders exhibiting repeat expansions, such as Huntington disease-like 2 (HDL2) with CAG/CTG trinucleotide expansion in the junctophilin 3 (JPH3) gene, dentatorubral pallidoluysian atrophy (DRPLA) with CAG repeat expansions in atrophin-1 (ATN1) gene and mutation in C9orf72 can present as phenocopies of HD [27,28,29].