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International Journal of Molecular Medicine
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Article

Novel mutation in exon 56 of the dystrophin gene in a child with Duchenne muscular dystrophy

  • Authors:
    • Jian-Fang Zhu
    • Hui-Hui Liu
    • Tao Zhou
    • Li Tian
  • View Affiliations / Copyright

    Affiliations: Central Laboratory of Union Hospital, Huazhong University of Science and Technology, Wuhan, Hubei 430022, P.R. China, Department of Anesthesiology, The First Affiliated Hospital, Guangzhou University of Traditional Chinese Medicine, Guangzhou, Guangdong 510405, P.R. China, Department of Otolaryngology, Union Hospital, Huazhong University of Science and Technology, Wuhan, Hubei 430022, P.R. China, Department of Pediatrics, Union Hospital, Huazhong University of Science and Technology, Wuhan, Hubei 430022, P.R. China
  • Pages: 1166-1170
    |
    Published online on: September 18, 2013
       https://doi.org/10.3892/ijmm.2013.1498
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Abstract

Duchenne type muscular dystrophy (DMD) is an allelic X-linked recessive disorder caused by mutations in the gene encoding dystrophin. Genotype analysis has shown that deletion mutations account for approximately 65% of all cases, and 5-10% are duplications, while the remaining 30% of affected individuals may have smaller mutations, including point mutations, small deletions or small insertions. In this study, we present the case of a 4-year-old boy with typical clinical features of DMD, who developed normally until the age of 2. However, at age 3 he presented his first symptom, a tendency to fall, had difficulty in rising from the floor and in walking on his toes. At age 4 he had a waddling gait and could no longer climb stairs. A physical examination revealed proximal muscle weakness, calf hypertrophy, deep tendon hyporflexia and a positive Gower's sign. To identify the disease-causing gene in the proband, all coding regions (exons 1-79) of the dystrophin gene were PCR-amplified and sequenced. A novel duplication (c.8284dupA) in exon 56 of the dystrophin gene was identified, which was predicted to generate a frameshift mutation and create a premature termination codon (p.Ile2762Asnfs*10). This mutation was further confirmed by single-strand conformation polymorphism (SSCP) analysis, which revealed an extra band found in exon 56 of the dystrophin in the proband; however, this was not present in his family members or in the 100 matched normal controls. The data presented in this study may aid in expanding the spectrum of mutations causing DMD. To our knowledge, we demonstrate for the first time that a small duplication mutation can cause severe DMD.
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Copy and paste a formatted citation
Spandidos Publications style
Zhu J, Liu H, Zhou T and Tian L: Novel mutation in exon 56 of the dystrophin gene in a child with Duchenne muscular dystrophy. Int J Mol Med 32: 1166-1170, 2013.
APA
Zhu, J., Liu, H., Zhou, T., & Tian, L. (2013). Novel mutation in exon 56 of the dystrophin gene in a child with Duchenne muscular dystrophy. International Journal of Molecular Medicine, 32, 1166-1170. https://doi.org/10.3892/ijmm.2013.1498
MLA
Zhu, J., Liu, H., Zhou, T., Tian, L."Novel mutation in exon 56 of the dystrophin gene in a child with Duchenne muscular dystrophy". International Journal of Molecular Medicine 32.5 (2013): 1166-1170.
Chicago
Zhu, J., Liu, H., Zhou, T., Tian, L."Novel mutation in exon 56 of the dystrophin gene in a child with Duchenne muscular dystrophy". International Journal of Molecular Medicine 32, no. 5 (2013): 1166-1170. https://doi.org/10.3892/ijmm.2013.1498
Copy and paste a formatted citation
x
Spandidos Publications style
Zhu J, Liu H, Zhou T and Tian L: Novel mutation in exon 56 of the dystrophin gene in a child with Duchenne muscular dystrophy. Int J Mol Med 32: 1166-1170, 2013.
APA
Zhu, J., Liu, H., Zhou, T., & Tian, L. (2013). Novel mutation in exon 56 of the dystrophin gene in a child with Duchenne muscular dystrophy. International Journal of Molecular Medicine, 32, 1166-1170. https://doi.org/10.3892/ijmm.2013.1498
MLA
Zhu, J., Liu, H., Zhou, T., Tian, L."Novel mutation in exon 56 of the dystrophin gene in a child with Duchenne muscular dystrophy". International Journal of Molecular Medicine 32.5 (2013): 1166-1170.
Chicago
Zhu, J., Liu, H., Zhou, T., Tian, L."Novel mutation in exon 56 of the dystrophin gene in a child with Duchenne muscular dystrophy". International Journal of Molecular Medicine 32, no. 5 (2013): 1166-1170. https://doi.org/10.3892/ijmm.2013.1498
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