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Severe lethal spinal muscular atrophy variant with arthrogryposis
Sevim Unal Kizilates1, Beril Talim, Kutay Sel
1Neonatal Intensive Care Unit, Diskapi, Ankara, Turkey.
Pediatric Neurology
|February 26, 2005
Summary
This study describes a severe spinal muscular atrophy case with congenital anomalies and early death, suggesting a probable X-linked form but not ruling out autosomal-recessive inheritance.
Area of Science:
- Neurology
- Genetics
- Pediatrics
Background:
- Spinal muscular atrophies (SMAs) are a diverse group of neuromuscular disorders.
- Atypical SMA forms present with varied clinical manifestations, including congenital anomalies.
Observation:
- A male infant born to consanguineous parents exhibited profound hypotonia, respiratory failure, arthrogryposis, and a femur fracture.
- The patient's elder brother died with similar clinical features.
- Postmortem examination revealed degeneration of anterior horn cells.
Findings:
- The patient presented with severe hypotonia, congenital anomalies, and died within two weeks of birth.
- Muscle biopsy showed variation in fiber size.
- The clinical presentation and family history suggest a probable X-linked spinal muscular atrophy, with autosomal-recessive inheritance as a possibility.
Implications:
- This case highlights the genetic heterogeneity of spinal muscular atrophy.
- Early diagnosis and genetic counseling are crucial for families with a history of severe neuromuscular disorders.
- Further research is needed to differentiate between X-linked and autosomal-recessive forms of severe infantile SMA.