[Centronuclear myopathy with autosomal dominant inheritance(author's transl)]

Area of Science:

• Neurology
• Genetics
• Pathology

Context:

• First documented cases of centronuclear myopathy in Germany.
• Affected individuals are a 14-year-old boy and his 18-year-old sister.
• Disease onset in early childhood (4-5 years) with characteristic symptoms.

Purpose:

• To describe the clinical, pathological, and genetic features of centronuclear myopathy in a German family.
• To investigate the inheritance pattern and potential pathogenetic mechanisms.
• To contribute to the understanding of this rare neuromuscular disease.

Summary:

• Patients presented with progressive muscle weakness, ptosis, external ophthalmoplegia, and areflexia, predominantly affecting distal lower extremities.
• Muscle biopsy revealed type I fiber hypotrophy, type II fiber hypertrophy, central nuclei, and myofibrillar abnormalities.
• Normal electrophysiological findings (EEG, nerve conduction velocities, neuromuscular transmission) were observed.
• Autosomal dominant inheritance is suggested by the father's similar, though less severe, phenotype.
• The disease exhibits genetic heterogeneity, and the clinical presentation appears independent of the inheritance mode.

Impact:

• Provides a detailed case study of centronuclear myopathy, aiding in diagnosis and understanding of the disease spectrum.
• Highlights the potential for autosomal dominant inheritance and genetic heterogeneity in centronuclear myopathy.
• Suggests a possible developmental disturbance in nerve-muscle structures as a pathogenetic factor.