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N-Acetylneuraminic acid storage disease
Human Genetics
|January 1, 1985
Summary
Salla disease, a rare genetic disorder, involves the buildup of free sialic acid (N-acetylneuraminic acid) in the body. This accumulation leads to neurological and physical developmental issues, with its exact cause still under investigation.
Area of Science:
- Biochemistry
- Genetics
- Pediatrics
Background:
- Salla disease is a rare lysosomal storage disorder.
- Characterized by intellectual disability, ataxia, and mucopolysaccharidosis-like features.
- Typically presents in early childhood.
Observation:
- A four-year-old boy exhibited mental retardation, ataxia, and mild mucopolysaccharidosis features.
- Elevated free sialic acid (N-acetylneuraminic acid) detected in various tissues and body fluids.
- Infantile onset of recurrent infections and hepatosplenomegaly, along with early skeletal abnormalities (dysostosis multiplex).
Findings:
- Free sialic acid in urine confirmed as N-acetylneuraminic acid via 1H-NMR spectroscopy.
- Normal sialidase enzyme activity observed.
- Increased bound sialic acid in liver and fibroblasts, suggesting inhibition of neuraminidase by excess free sialic acid.
Implications:
- Suggests an intracellular mechanism of N-acetylneuraminic acid accumulation in Salla disease.
- Hypothesizes a potential defect in lysosomal transport of neuraminic acid.
- Highlights the need for further research into the molecular basis of this condition.