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Oculopharyngeal muscular dystrophy in France
1Unité de Recherche de Développement, Pathologie et Régénération Neuromusculaires, INSERM U. 153, Hôpital de la Salpêtrière, Paris, France.
Abstract:
The clinical, histopathological, ultrastructural and geographical data on 29 cases of oculopharyngeal muscular dystrophy (OPMD) identified by the authors in France is briefly presented. The mean age of the patients was 53.8 +/- 8.1 years. Onset symptoms were ptosis (14/29), dysphagia (12/29) and limb girdle weakness (3/29). The evolution of the disease was always progressive and followed different clinical patterns. The main histological changes in muscle biopsies were atrophic angulated fibers (29/29) and rimmed vacuoles (25/29); muscle fiber necrosis was very rare (1/29). The characteristic nuclear inclusions made of 8.5-nm filaments were observed in all cases, and found in 2-5% of the nuclei in a given ultrathin section. They are the morphological marker of the disease.
Insights
Oculopharyngeal muscular dystrophy (OPMD) is a progressive genetic disorder. Key findings include characteristic nuclear inclusions in muscle biopsies, serving as a definitive morphological marker for diagnosis.
Area of Science:
- Neurology
- Genetics
- Pathology
Background:
- Oculopharyngeal muscular dystrophy (OPMD) is a rare, late-onset genetic muscle disease.
- Characterized by ptosis, dysphagia, and proximal muscle weakness.
- Previous studies highlight the need for comprehensive data on OPMD clinical and pathological features.
Purpose of the Study:
- To present clinical, histopathological, ultrastructural, and geographical data of 29 OPMD cases in France.
- To identify the characteristic morphological markers of OPMD.
Main Methods:
- Retrospective analysis of clinical data from 29 identified OPMD patients.
- Histopathological examination of muscle biopsies, including light and electron microscopy.
- Assessment of geographical distribution and patient demographics.
Main Results:
- Mean patient age was 53.8 years, with onset symptoms including ptosis, dysphagia, and limb weakness.
- Muscle biopsies showed atrophic angulated fibers and rimmed vacuoles; necrosis was rare.
- Characteristic 8.5-nm filament nuclear inclusions were present in all cases (2-5% of nuclei).
Conclusions:
- Nuclear inclusions are the definitive morphological marker for OPMD.
- OPMD presents with progressive clinical patterns and distinct histopathological findings.
- This study provides valuable data on OPMD in a French cohort.