- Myotonic dystrophy is closely linked to the gene for muscle-type creatine kinase (CKMM). Brunner, H.G., Korneluk, R.G., Coerwinkel-Driessen, M., MacKenzie, A., Smeets, H., Lambermon, H.M., van Oost, B.A., Wieringa, B., Ropers, H.H. Hum. Genet. (1989)