Analysis of Dystrophin Expression after Activation of Myogenesis in Amniocytes, Chorionic-Villus Cells, and Fibroblasts -- A New Method for Diagnosing Duchenne's Muscular Dystrophy

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Abstract
DNA analysis of peripheral-blood leukocytes is routinely used to demonstrate mutations in the dystrophin gene in patients with Duchenne's or Becker's muscular dystrophy. In approximately 35 percent of patients, DNA studies are not informative; in these patients immunochemical analysis of a muscle-biopsy specimen can determine whether dystrophin, the protein product of the gene for Duchenne's dystrophy, is present at reduced levels or absent. DNA analysis can be performed in amniocytes or chorionic-villus cells to identify mutations of the dystrophic gene prenatally, but immunochemical testing for dystrophin cannot be performed because the protein is not expressed in these cells.