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A case of juvenile metachromatic leukodystrophy--the third case in Japan
Y Mizuno1, Y Nakamura, A Sugaya
1Department of Pediatrics, Tokyo Metropolitan Neurological Hospital, Japan.
Abstract:
We report here a case of juvenile metachromatic leukodystrophy. The patient is an 8-year-old boy with motor and mental deterioration, which began at about age 3. He has also suffered from astatic seizures since age 8. Arylsulfatase A activity in the patient was markedly decreased in peripheral leukocytes, cultured fibroblasts and urine. Sulfatide was detected in urine from the patient by thin-layer chromatography. Peripheral motor and sensory nerve conduction velocities were markedly reduced. Computerized tomography of the brain showed low density areas in the periventricular white matter which were not enhanced by intravenous contrast material. His parents' arylsulfatase A activities were about half those of normal controls. This is the third case of juvenile metachromatic leukodystrophy in Japan.
Insights
This study details a case of juvenile metachromatic leukodystrophy (MLD) in an 8-year-old boy, presenting with significant motor and mental decline. Diagnosis was confirmed by low arylsulfatase A activity and elevated sulfatides, highlighting a rare genetic disorder.
Area of Science:
- Neuroscience
- Biochemistry
- Genetics
Background:
- Juvenile metachromatic leukodystrophy (MLD) is a rare lysosomal storage disorder.
- It is characterized by progressive demyelination of the central and peripheral nervous systems.
- MLD is caused by mutations in the ARSA gene, leading to arylsulfatase A deficiency.
Observation:
- An 8-year-old boy presented with progressive motor and mental deterioration starting at age 3 and astatic seizures.
- Markedly decreased arylsulfatase A activity was observed in the patient's leukocytes, fibroblasts, and urine.
- Sulfatides were detected in urine, and nerve conduction velocities were significantly reduced.
Findings:
- Brain CT revealed periventricular white matter hypodensities without contrast enhancement.
- Parents exhibited approximately 50% of normal arylsulfatase A activity, suggesting carrier status.
- This represents the third reported case of juvenile MLD in Japan.
Implications:
- This case contributes to the understanding of juvenile MLD's clinical and biochemical presentation.
- Early diagnosis and genetic counseling are crucial for affected families.
- Further research into MLD pathogenesis and potential therapeutic strategies is warranted.