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Vacuolar myopathy sparing the quadriceps
1Department of Neurology, Chaim Sheba Medical Center, Tel Hashomer, Israel.
Brain : a Journal of Neurology
|February 1, 1993
Summary
This study identifies a distinct progressive myopathy in Iranian Jewish families, characterized by specific muscle wasting patterns and vacuoles. Genetic analysis suggests a potential autosomal recessive inheritance for this unique neuromuscular disorder.
Area of Science:
- Neurology
- Genetics
- Muscle Diseases
Background:
- Progressive muscle weakness and wasting observed in 22 Jewish patients from 15 families, primarily of Iranian origin.
- Initial symptoms included distal leg weakness, progressing to proximal muscles, with quadriceps sparing.
- Family history suggested consanguinity in seven families, hinting at a possible genetic basis.
Purpose of the Study:
- To characterize a potentially distinct myopathic entity observed in Iranian Jewish populations.
- To investigate the clinical, pathological, and genetic features of this progressive muscle disorder.
Main Methods:
- Clinical examination and family history collection.
- Muscle imaging using computerized tomography (CT) scans.
- Muscle biopsy analysis via light and electron microscopy.
- Electromyography (EMG) studies, including macro-EMG and single-fiber EMG.
Main Results:
- CT scans revealed variable muscle wasting and fatty replacement, with normal vastus lateralis.
- Microscopy showed vacuoles, internal nuclei, fiber splitting, and fibrosis without inflammation.
- EMG indicated a primary myopathic disorder.
- Consanguinity and affected siblings suggested an autosomal recessive trait.
Conclusions:
- The findings suggest a distinct myopathic entity prevalent in Iranian Jews.
- The disorder is characterized by specific pathological features and a potential autosomal recessive inheritance pattern.
- Further research is warranted to identify the specific genetic cause.