Mutations in the : dystrophin gene, Xp21.2-p21.1, causes weakness in large, then small, skeletal muscles. Weakness of heart muscle, smooth muscle of GI tract & urinary tracts, Speech Sound Disorder, Intellectual Disability, Specific Learning Disability & behavior problems occur in some boys. Carrier girls may have cardiomyopathy. Specific mutations determine manifestations in boys & carrier girls. See mda.org.
Answered 1/5/2015
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