In doing a little digging about autism and myotonic dystrophy, Fragile X is a disease that pops right to the top of the screen. This is also a triplet expansion disease and it has a couple of similarities especially to some of the childhood forms of myotonic dystrophy. Fragile x causes mental retardation (Global developmental delay) as well as many of the kids have Autism or Autism spectrum disorder. Here is a review of Autism and Fragile X

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