Myotonic dystrophy: disease repeat range, penetrance, age of onset, and relationship between repeat size and phenotypes.

Abstract excerpt

Myotonic dystrophy (DM) is an autosomal dominant neuromuscular disease primarily characterized by myotonia and progressive muscle weakness. The pathogenesis of DM involves microsatellite expansions in noncoding regions of transcripts that result in toxic RNA gain-of-function. Each successive generation of DM families carries larger repeat expansions, leading to an earlier age of onset with increasing disease...

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