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Alpha-sarcoglycan deficiency featuring exercise intolerance and myoglobinuria.

T Mongini1, C Doriguzzi, I Bosone

  • 1P Peirolo Centre for Neuromuscular Diseases, Department of Neurosciences, University of Turin, Italy. tmongini@molinette.piemonte.it

Neuropediatrics
|June 21, 2002
PubMed
Summary
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Sarcoglycan deficiencies can present with exercise intolerance and myoglobinuria, symptoms previously associated with Becker muscular dystrophy. This highlights the importance of considering sarcoglycan deficiencies in diagnosing such muscular conditions.

Area of Science:

  • Genetics and Molecular Biology
  • Neurology and Muscular Disorders

Background:

  • Investigating the clinical and molecular spectrum of sarcoglycanopathies.
  • Understanding the genetic basis of muscular dystrophies beyond Duchenne and Becker types.

Observation:

  • An 8-year-old boy presented with fatigue, hyperCKemia, and scapular winging.
  • Progressive symptoms included exercise intolerance and myoglobinuria.
  • Muscle biopsy revealed reduced alpha-sarcoglycan, confirmed by Western blotting.

Findings:

  • Molecular analysis identified compound heterozygosity for Arg284Cys and Glu137Lys substitutions in the sarcoglycan gene.
  • The patient developed proximal weakness, paraspinal muscle involvement, and spinal deformities by age 20.
  • Genetic mutations directly correlated with reduced alpha-sarcoglycan protein levels.

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Implications:

  • Exercise intolerance and myoglobinuria are crucial indicators for sarcoglycan deficiencies.
  • Broadens the differential diagnosis for muscular dystrophies presenting with these symptoms.
  • Emphasizes the need for comprehensive genetic and protein analysis in diagnosing sarcoglycanopathies.