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On symptomatic heterozygous alpha-sarcoglycan gene mutation carriers
Dirk Fischer1, Stefania Aurino, Vincenzo Nigro
1Muskellabor, Department of Neurology, University of Bonn, Sigmund-Freud-Strasse 25, 53105 Bonn, Germany.
Annals of Neurology
|November 5, 2003
Summary
A mutation in the alpha-sarcoglycan gene can cause muscular dystrophy. Heterozygous carriers may show symptoms like scapular winging, suggesting a role for modifier genes.
Area of Science:
- Genetics
- Neurology
- Molecular Biology
Background:
- Mutations in the alpha-sarcoglycan gene are linked to various muscular dystrophies and exercise intolerance.
- The sarcoglycan complex is crucial for muscle function, and its disruption leads to muscle disease.
Purpose of the Study:
- To investigate the clinical presentation of a specific alpha-sarcoglycan gene mutation (371 T > C, Ile124Thr) in a German family.
- To explore the phenotype of heterozygous carriers of this mutation.
Main Methods:
- Clinical evaluation of an affected family across three generations.
- Genetic analysis to identify and confirm the alpha-sarcoglycan gene mutation.
Main Results:
- The index patient, homozygous for the mutation, exhibited a severe Duchenne-like muscular dystrophy phenotype.
- Seven out of 12 heterozygous carriers displayed mild to moderate scapular winging, indicating selective muscle weakness.
Conclusions:
- Heterozygous carriers of alpha-sarcoglycan gene mutations can present with symptomatic muscle weakness, particularly scapular winging.
- This suggests that modifier genes may influence the phenotype in carriers, similar to dystrophinopathies.