Deactivation of TBP contributes to SCA17 pathogenesis

Tun Chieh Hsu, Cheng Kuang Wang, Chun Yen Yang, Li Ching Lee, Hsiu Mei Hsieh-Li, Long Sun Ro, Chiung Mei Chen, Guey Jen Lee-Chen, Ming Tsan Su

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12 Citations (Scopus)

Abstract

Spinocerebellar ataxia type 17 (SCA17) is an autosomal dominant cerebellar ataxia caused by the expansion of polyglutamine (polyQ) within the TATA box-binding protein (TBP). Previous studies have shown that polyQ-expanded TBP forms neurotoxic aggregates and alters downstream genes. However, how expanded polyQ tracts affect the function of TBP and the link between dysfunctional TBP and SCA17 is not clearly understood. In this study, we generated novel Drosophila models for SCA17 that recapitulate pathological features such as aggregate formation, mobility defects and premature death. In addition to forming neurotoxic aggregates, we determined that polyQ-expanded TBP reduces its own intrinsic DNA-binding and transcription abilities. Dysfunctional TBP also disrupts normal TBP function. Furthermore, heterozygous dTbp amorph mutant flies exhibited SCA17-like phenotypes and flies expressing polyQ-expanded TBP exhibited enhanced retinal degeneration, suggesting that loss of TBP function may contribute to SCA17 pathogenesis. We further determined that the downregulation of TBP activity enhances retinal degeneration in SCA3 and Huntington's disease fly models, indicating that the deactivation of TBP is likely to play a common role in polyQ-induced neurodegeneration.

Original languageEnglish
Pages (from-to)6878-6893
Number of pages16
JournalHuman molecular genetics
Volume23
Issue number25
DOIs
Publication statusPublished - 2014 Dec 20

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ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Genetics(clinical)

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