The Cerebellum

, Volume 7, Issue 2, pp 170–178 | Cite as

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

Original Article

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.

Key words

Spinocerebellar ataxias spinocerebellar degenerations Huntington’s disease SCA17 HDL4 

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© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.INSERM U679, Groupe Pitié-SalpetrièreParis Cedex 13France
  2. 2.Université Pierre et Marie Curie – Paris 6, UMR S679, Institut Fédératif de Recherche en NeurosciencesGroupe Hospitalier Pitié-SalpetrièreParisFrance
  3. 3.Département de Génétique et CytogénétiqueAPHP, Groupe Hospitalier Pitié-SalpetrièreParisFrance

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