TARDBP mutation analysis in TDP-43 proteinopathies and deciphering the toxicity of mutant TDP-43

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28 Scopus citations

Abstract

The identification of TAR DNA-binding protein 43 (TDP-43) as the major disease protein in amyotrophic lateral sclerosis (ALS) and frontotemporal lobar degeneration with ubiquitin inclusions has defined a new class of neurodegenerative conditions: the TDP-43 proteinopathies. This breakthrough was quickly followed by mutation analysis of TARDBP, the gene encoding TDP-43. Herein, we provide a review of our previously published efforts that led to the identification of 3 TARDBP mutations (p.M337V, p.N345K, and p.I383V) in familial ALS patients, two of which were novel. With over 40 TARDBP mutations now discovered, there exists conclusive evidence that TDP-43 plays a direct role in neurodegeneration. The onus is now on researchers to elucidate the mechanisms by which mutant TDP-43 confers toxicity, and to exploit these findings to gain a better understanding of how TDP-43 contributes to the pathogenesis of disease. Our biochemical analysis of TDP-43 in ALS patient lymphoblastoid cell lines revealed a substantial increase in TDP-43 truncation products, including a ~25 kDa fragment, compared to control lymphoblastoid cell lines. We discuss the putative harmful consequence of abnormal TDP-43 fragmentation, as well as highlight additional mechanisms of toxicity associated with mutant TDP-43.

Original languageEnglish (US)
Pages (from-to)S35-S45
JournalJournal of Alzheimer's Disease
Volume33
Issue numberSUPPL. 1
DOIs
StatePublished - 2013

Keywords

  • Amyotrophic lateral sclerosis
  • TARDBP
  • TDP-43
  • frontotemporal lobar degeneration
  • mutation
  • neurodegeneration

ASJC Scopus subject areas

  • Neuroscience(all)
  • Clinical Psychology
  • Geriatrics and Gerontology
  • Psychiatry and Mental health

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