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Congenital muscular dystrophy with abnormal radiographic myelin pattern
J D Cook1, G G Gascon, A Haider
1Department of Pediatrics, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia.
Journal of Child Neurology
|April 1, 1992
Summary
This study identifies a congenital muscular dystrophy (CMD) subtype with specific brain and muscle abnormalities. Researchers propose it represents a distinct allelic variant of a gene crucial for muscle, myelin, and brain development.
Area of Science:
- Neurology
- Genetics
- Pediatrics
Background:
- Congenital muscular dystrophy (CMD) encompasses a group of inherited disorders affecting muscle development and function.
- Existing CMD classifications include Fukuyama CMD, Walker-Warburg (cerebral-ocular CMD), and Santavuori (muscle-eye-brain CMD).
- A distinct homogeneous clinical syndrome in children suggests a potentially unclassified or related CMD phenotype.
Purpose of the Study:
- To characterize a homogeneous clinical syndrome observed in 11 children with congenital muscular dystrophy.
- To compare this syndrome with previously reported cases and established CMD phenotypes.
- To propose a genetic basis and classification for this CMD variant.
Main Methods:
- Clinical assessment of 11 affected children, detailing symptoms from birth, muscle weakness, reflexes, creatine kinase levels, and nerve conduction.
- Analysis of muscle biopsy findings and neuroimaging (brain MRI) for white-matter abnormalities.
- Comparison of the current cohort with 48 previously reported similar cases and established CMD subtypes.
Main Results:
- The 11 children presented with consistent symptoms: neonatal weakness, slow improvement, generalized muscle weakness, areflexia, elevated creatine kinase, normal nerve conduction, dystrophic muscle changes, and specific periventricular white-matter abnormalities.
- This syndrome was designated as altered myelin radiographic pattern congenital muscular dystrophy (CMD), equivalent to occidental CMD.
- Phenotypic comparison suggested a relationship to Fukuyama CMD, Walker-Warburg CMD, and Santavuori CMD.
Conclusions:
- The identified syndrome represents a distinct phenotype of congenital muscular dystrophy, characterized by specific neurological and muscular features.
- Researchers propose that this phenotype, along with other recognized CMDs, may result from allelic variations of a single gene.
- This gene likely plays a critical role in regulating structural proteins essential for muscle integrity, myelination, and cortical development, explaining the observed phenotypic diversity.