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Myotonic dystrophy type 2

Other Names for this Disease
  • DM2
  • Dystrophia myotonica type 2
  • Myotonic myopathy, proximal
  • Proximal myotonic myopathy
More Names
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Myotonic dystrophy type 2, one of the two types of myotonic dystrophy, is an inherited muscular dystrophy that affects the muscles and other body systems (e.g., heart, eyes, and pancreas). It is characterized by prolonged muscle tensing (myotonia) as well as muscle weakness, pain, and stiffness. Signs and symptoms usually develop during a person's twenties or thirties. Muscles in the neck, fingers, elbows, and hips are typically affected; facial and ankle muscles are less commonly involved.[1] The severity of myotonic dystrophy type 2 varies widely among affected people, even among family members.[2] It is inherited in an autosomal dominant pattern and is caused by mutations in the CNBP gene.[2] Treatment is based on each person's specific signs and symptoms.
Last updated: 2/10/2014


  1. Dalton JC, Ranum LPW, Day JW. Myotonic Dystrophy Type 2. GeneReviews. April 23, 2007; Accessed 4/8/2012.
  2. Learning About Myotonic Dystrophy. National Human Genome Research Institute (NHGRI). March 23, 2011; Accessed 4/8/2012.
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  • The Online Mendelian Inheritance in Man (OMIM) is an catalog of human genes and genetic disorders. Each entry has a summary of related medical articles. It is meant for health care professionals and researchers. OMIM is maintained by Johns Hopkins University School of Medicine. 
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