DM1 is caused by the expansion of unstable repetitions of the cytosine-thymine-guanine trinucleotide (CTG) in the 3’ untranslated region (3’UTR) of the Myotonic Dystrophy Protein Kinase (DMPK) gene located at chromosome 19q13.3 [4,5,6,7]. Here, DMPK is linked to myotonic dystrophy type 1.