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Spinocerebellar ataxia type 20
Elsdon Storey1, Melanie A Knight, Susan M Forrest
1Department of Medicine (Neurosciences), Alfred Hospital Campus of Monash University, Melbourne, Australia. elsdon.storey@med.monash.edu.au
Cerebellum (London, England)
|May 18, 2005
Summary
Spinocerebellar ataxia type 20 (SCA20) presents unique symptoms like palatal tremor and speech issues, distinct from other ataxias. Genetic mapping suggests a specific locus on chromosome 11, differentiating it from SCA5.
Area of Science:
- Neurogenetics
- Neurology
Background:
- Spinocerebellar ataxia type 20 (SCA20) is a rare, inherited neurodegenerative disorder.
- First identified in an Australian family, SCA20 exhibits a distinct clinical presentation.
Purpose of the Study:
- To characterize the clinical and genetic features of Spinocerebellar ataxia type 20 (SCA20).
- To differentiate SCA20 from other spinocerebellar ataxias, particularly SCA5.
Main Methods:
- Clinical phenotyping including neurological examination and MRI.
- Genetic linkage analysis to map the SCA20 locus to chromosome 11.
Main Results:
- Distinctive phenotype: palatal tremor, hypermetric saccades, early dentate calcification, and prominent dysarthria/dysphonia.
- MRI findings: pancerebellar atrophy, dentate calcification, olivary pseudohypertrophy; normal nerve conduction studies.
- Genetic locus for SCA20 identified on chromosome 11, overlapping with SCA5, but with distinct clinical features.
Conclusions:
- SCA20 is a rare spinocerebellar ataxia with a unique phenotype and genetic locus.
- Clinical and genetic data suggest SCA20 is a distinct entity from SCA5, pending gene discovery.