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Atypical Prader-Willi syndrome with severe developmental delay and emaciation
1Department of Child Development, Kumamoto University Medical School, Japan.
Brain & Development
|January 1, 1988
Summary
This case study details a boy with Prader-Willi syndrome and additional symptoms, highlighting a chromosome 15 deletion and muscle biopsy findings. The study emphasizes severe developmental delay and hypotonia in affected children.
Area of Science:
- Genetics
- Pediatrics
- Neuromuscular Disorders
Background:
- Prader-Willi syndrome (PWS) is a complex genetic disorder affecting multiple systems.
- Key features include hypotonia, developmental delay, and characteristic facial features.
Observation:
- A young boy presented with PWS symptoms, including hypotonia, cryptorchidism, dysmorphic facial features, and an open triangular mouth.
- Additional symptoms observed were simian creases and multiple joint ankylosis in infancy.
- Genetic analysis revealed a deletion in the long arm of chromosome 15 (q11.2 to q13).
Findings:
- Muscle biopsy showed significant abnormalities: variation in fiber size, hypertrophic type 1 fibers, small type 2 fibers, paucity of type 2B fibers, and an increase in type 2C fibers.
- At 4.5 years, the child exhibited severe developmental delay, profound muscle hypotonia, weakness, and emaciation.
Implications:
- This case expands the understanding of PWS phenotypic variability.
- Highlights the importance of genetic testing and muscle biopsy in diagnosing complex pediatric cases.
- Suggests potential links between specific chromosomal deletions and distinct clinical presentations in PWS.