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Related Experiment Videos

Phenotypic variability in rippling muscle disease.

M Vorgerd1, H Bolz, T Patzold

  • 1Department of Neurology, Ruhr-University, Bochum, Germany. matthias.vorgerd@ruhr-uni-bochum.de

Neurology
|May 5, 1999
PubMed
Summary
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Hereditary rippling muscle disease (RMD) is characterized by variable symptoms, but generalized percussion-induced rapid muscle contractions (PIRCs) are the most reliable clinical feature. Genetic analysis excluded linkage to the previously identified RMD locus.

Area of Science:

  • Neurology
  • Genetics
  • Rare Diseases

Background:

  • Hereditary rippling muscle disease (RMD) is a rare, autosomal-dominant neuromuscular disorder.
  • Patients typically experience muscle stiffness, exercise-induced pain, and cramping, with characteristic electrically silent mechanical muscle irritability.

Observation:

  • This study examined 46 individuals from two German kindreds with suspected RMD.
  • Clinical evaluation focused on characterizing the phenotype and performing genetic linkage analysis.

Findings:

  • Percussion-induced rapid muscle contractions (PIRCs) and muscle mounding were consistently observed in all 19 affected individuals.
  • Muscle rippling was present in only 12 individuals, indicating variable expressivity.
  • Genetic linkage analysis excluded the previously identified RMD locus on chromosome 1q4 in both kindreds.

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Implications:

  • Generalized PIRCs are the most reliable clinical diagnostic feature of RMD.
  • Diagnostic criteria for RMD should incorporate PIRCs, muscle mounding, rippling, and creatine kinase levels.
  • Further genetic studies are needed to identify the causative gene for RMD.