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Autosomal recessive distal muscular dystrophy
C Scoppetta1, B Mercuri, R Di Lello
1Istituto di Clinica delle Malattie Nervose e Mentali, Università di Roma La Sapienza, Italy.
Italian Journal of Neurological Sciences
|December 31, 1997
Summary
This study describes a novel autosomal recessive distal myopathy in two sisters, distinct from known forms. The condition affects lower leg muscles initially, progressing over years with high enzyme levels and specific muscle fiber atrophy.
Area of Science:
- Neurology
- Genetics
- Muscle Disorders
Background:
- Distal myopathies encompass various inherited and sporadic conditions.
- Two well-defined autosomal recessive distal myopathies are Miyoshi's myopathy and distal myopathy with rimmed vacuoles.
Observation:
- Two sisters presented with a unique distal myopathy.
- Onset was in early adulthood, initially affecting tibialis anterior and peroneal muscles.
- Progression involved calf muscles, then proximal leg and arm muscles over 10-12 years.
Findings:
- Autosomal recessive inheritance pattern observed.
- Markedly elevated serum creatine kinase (CK) and other muscle enzymes were consistently noted.
- Electromyography (EMG) showed myopathic changes with fibrillation, and muscle biopsy revealed dystrophic myopathy with type 2 fiber atrophy.
Implications:
- The described syndrome appears to be a distinct entity from previously identified autosomal recessive distal myopathies.
- Further research is needed to identify the genetic basis and specific pathological mechanisms.
- This finding expands the spectrum of distal myopathies and aids in differential diagnosis.