DM1 is the most common adult form of muscular dystrophy and is caused by the expansion of cytosine-thymine-guanine (CTG) repeats in the trinucleotide of the untranslated region (3′ UTR) of the Dystrophia Myotonia Protein Kinase (DMPK) gene located on chromosome 19q13.3 (Mahadevan et al., 1992; Bird, 1993). Here, DMPK is linked to myotonic dystrophy type 1.