Skip to Main content Skip to Navigation
Journal articles

Spinocerebellar ataxia 17 (SCA17) and Huntington's disease-like 4 (HDL4).

Abstract : Spinocerebellar ataxia 17 (SCA17) or Huntington's disease-like-4 is a neurodegenerative disease caused by the expansion above 44 units of a CAG/CAA repeat in the coding region of the TATA box binding protein (TBP) gene leading to an abnormal expansion of a polyglutamine stretch in the corresponding protein. Alleles with 43 and 44 repeats have been identified in sporadic cases and their pathogenicity remains uncertain. Furthermore, incomplete penetrance of pathological alleles with up to 49 repeats has been suggested. The imperfect nature of the repeat makes intergenerational instability extremely rare and de novo mutations are most likely the result of partial duplications. This is one of the rarer forms of autosomal dominant cerebellar ataxia but the associated phenotype is often severe, involving various systems (cerebral cortex, striatum, and cerebellum), with extremely variable age at onset (range: 3-75 years) and clinical presentation. This gene is thought to account for a small proportion of patients with a Huntington's disease-like phenotype and cerebellar signs. Parkinson's disease-like, Creutzfeldt-Jakob disease-like and Alzheimer disease-like phenotypes have also been described with small SCA17 expansions. The abnormal protein is expressed at the same level as its normal counterpart and forms neuronal intranuclear inclusions containing other proteins involved in protein folding or degradation. The increase in the size of the glutamine stretch enhances transcription in vitro, probably leading to transcription deregulation. Interestingly, the TBP protein mutated in SCA17 is recruited in the inclusions of other polyglutaminopathies, suggesting its involvement in the transcription down-regulation observed in these diseases.
Document type :
Journal articles
Complete list of metadatas

Cited literature [89 references]  Display  Hide  Download

https://www.hal.inserm.fr/inserm-00293796
Contributor : Farid Aouinat <>
Submitted on : Thursday, March 26, 2009 - 3:35:11 PM
Last modification on : Wednesday, August 19, 2020 - 11:16:58 AM
Long-term archiving on: : Friday, May 28, 2010 - 7:53:08 PM

File

SCA17_HD-Stevanin.pdf
Files produced by the author(s)

Identifiers

Citation

Giovanni Stevanin, Alexis Brice. Spinocerebellar ataxia 17 (SCA17) and Huntington's disease-like 4 (HDL4).. Cerebellum, Springer Verlag (Germany), 2008, 7 (2), pp.170-8. ⟨10.1007/s12311-008-0016-1⟩. ⟨inserm-00293796⟩

Share

Metrics

Record views

519

Files downloads

941