Myotonic dystrophy type 1 and type 2 are forms of muscular dystrophies caused by expansions of tri- and tetranucleotide repeats in noncoding RNA. In type 1, the repeat expansion is found in the 3' UTR of the dystrophia myotonica protein kinase gene (DMPK). In type 2, the expansion is found in an intron of the zinc finger protein-9 gene (ZNF9).
See also our page on Muscular dystrophies.
For more information see:
- OMIM's entry on Myotonic dystrophy, type 1
- OMIM's entry on Myotonic dystrophy, type 2
- NIH's Genetics Home Reference
- The MDA's Myotonic dystrophy page
- National Organization for Rare Disorders