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Fucosidosis with dystonia
B A Gordon1, K E Gordon, H C Seo
1Department of Biochemical Genetics, CPRI, London, ON, Canada.
Neuropediatrics
|December 1, 1995
Summary
Fucosidosis is a rare neurodegenerative disorder. A Canadian male patient presented with unique dystonic posturing, linked to the Q422X mutation in the alpha-fucosidase gene.
Area of Science:
- Biochemistry
- Genetics
- Neuroscience
Background:
- Fucosidosis is a rare lysosomal storage disorder causing progressive neurodegeneration.
- It is characterized by intellectual disability, motor decline, and spasticity.
Observation:
- A Canadian male patient with fucosidosis exhibited progressive dystonic posturing starting at age 5.
- This dystonia, initially unilateral, later involved both lower limbs.
Findings:
- Cultured lymphoblasts showed absent alpha-fucosidase activity and protein.
- The patient was homozygous for the Q422X mutation (C to T transition) in the alpha-fucosidase gene.
- This mutation abolished an EcoR1 restriction site.
Implications:
- The Q422X mutation is a known cause of fucosidosis.
- The novel presentation of dystonic posturing in a patient homozygous for Q422X expands the clinical spectrum of fucosidosis.
- This case highlights the importance of genetic analysis in understanding rare neurodegenerative diseases.