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עמוד בית
Sun, 21.07.24

Original Articles

IMAJ | volume

Journal 2, February 2003
pages: 94-97

Large In-Frame Deletions of the Rod-Shaped Domain of the Dystrophin Gene Resulting in Severe Phenotype


    Background: The prediction that Duchenne muscular dystrophy patients have out-of-frame deletions and Becker muscular dystrophy patients have in-frame deletions of the dystrophin gene holds well in the vast majority of cases. Large in-frame deletions involving the rod domain only have usually been associated with mild (BMD[1]) phenotype.

    Objectives: To describe unusual cases with large in-frame deletions of the rod-shaped domain of the dystrophin gene associated with severe (Duchenne) clinical phenotype

    Methods: Screening for dystrophin gene deletion was performed on genomic DNA by using multiplex polymerase chain reaction. Needle muscle biopsies from the quadriceps were obtained using a BergstrÖm needle. The biopsies were stained with histologic and histochemical techniques as well as monoclonal antibodies to dystrophin 1, 2 and 3.

    Results: In three children with large in-frame deletions of the rod domain (exons 10–44, 13–40 and 3–41), early-onset weakness and a disease course suggested the DMD[2] phenotype.

    Conclusions: This observation emphasizes the uncertainty in predicting the Becker phenotype in a young patient based on laboratory evaluation, and that the clinical picture should always be considered.

    [1] BMD = Becker muscular dystrophy

    [2] DMD = Duchenne muscular dystrophy

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