Related Experiment Video
Updated: Aug 29, 2026
Do's and Don'ts in the Preparation of Muscle Cryosections for Histological Analysis
Published on: May 15, 2015
[Immunohistochemical studies of a variant of congenital muscular dystrophy]
Mieko Yoshioka1, Kazuma Sugie, Ichizo Nishino
1Section of Pediatric Neurology, Kobe City Pediatric and General Rehabilitation Center for the Challenged, Kobe, Hyogo. mieko@mte.biglobe.ne.jp
Abstract:
Three Japanese patients from 2 families had a phenotype indistinguishable from that of Fukuyama-type congenital muscular dystrophy (FCMD). A full mutational analysis of the fukutin gene, however, revealed neither a 3 kb insertion (the Japanese founder mutation) nor a point mutation. A RT-PCR analysis of one of the patients revealed a normal expression of the fukutin transcript, suggesting that they have a new variant of CMD. An immunohistochemical analysis of the muscle of one case showed that the immunoreaction to alpha-dystroglycan (DG) was barely detectable on the surface membranes of muscle fibers. Immunoreactions to beta-DG, dystrophin, laminin alpha-2 chain and sarcoglycan were normal. These findings raise the possibility that the abnormality of alpha-DG is integral to the pathology seen in this variant of CMD. Analysis of POMGnT1 gene, which is causative of muscle-eye-brain disease, revealed no mutation in this case.
Insights
Researchers identified a new congenital muscular dystrophy (CMD) variant in Japanese patients lacking typical fukutin gene mutations. The study suggests a potential alpha-dystroglycan abnormality is key to this CMD variant's pathology.
Area of Science:
- Genetics
- Neurology
- Molecular Biology
Background:
- Fukuyama-type congenital muscular dystrophy (FCMD) is a severe genetic disorder.
- FCMD is typically caused by mutations in the fukutin gene, with a common founder mutation in Japan.
Observation:
- Three Japanese patients from two families presented with clinical symptoms indistinguishable from FCMD.
- Comprehensive genetic analysis excluded known fukutin gene mutations (3 kb insertion or point mutations).
- RT-PCR showed normal fukutin transcript expression in one patient.
Findings:
- Immunohistochemistry revealed significantly reduced alpha-dystroglycan (DG) on muscle fiber membranes in one patient.
- Reactions for beta-DG, dystrophin, laminin alpha-2 chain, and sarcoglycans were normal.
- No mutations were found in the POMGnT1 gene, ruling out muscle-eye-brain disease.
Implications:
- These findings suggest a novel variant of congenital muscular dystrophy (CMD).
- The data points to a potential primary defect in alpha-dystroglycan processing or function.
- This highlights the heterogeneity of CMD and the importance of investigating alpha-dystroglycan abnormalities in undiagnosed cases.
Related Concept Videos
01:21Satellite Stem Cells and Muscular Dystrophy
01:15Myasthenia Gravis: Diagnostic Tests
The edrophonium test is a diagnostic tool for myasthenia gravis. It involves...