Myotonic dystrophy type 1 (DM1, OMIM 160900) is an inherited and the most common neuromuscular disorder characterized genetically by an expansion of trinucleotide repeats within the 3' untranslated region of the DMPK (DM1 protein kinase) gene [1–5]. Here, WEE1 is linked to myotonic dystrophy type 1.