Interaction with polyglutamine aggregates reveals a Q/N-rich domain in TDP-43

Rodrigo A. Fuentealba, Maria Udan, Shaughn Bell, Iga Wegorzewska, Jieya Shao, Marc I. Diamond, Conrad C. Weihl, Robert H. Baloh

Research output: Contribution to journalArticle

111 Scopus citations

Abstract

The identification of pathologic TDP-43 aggregates in amyotrophic lateral sclerosis (ALS) and frontotemporal lobar degeneration, followed by the discovery of dominantly inherited point mutations in TDP-43 in familial ALS, have been critical insights into the mechanism of these untreatable neurodegenerative diseases. However, the biochemical basis of TDP-43 aggregation and the mechanism of how mutations in TDP-43 lead to disease remain enigmatic. In efforts to understand how TDP-43 alters its cellular localization in response to proteotoxic stress, we found that TDP-43 is sequestered into polyglutamine aggregates. Furthermore, we found that binding to polyglutamine aggregates requires a previously uncharacterized glutamine/asparagine (Q/N)-rich region in the C-terminal domain of TDP-43. Sequestration into polyglutamine aggregates causes TDP-43 to be cleared from the nucleus and become detergent-insoluble. Finally, we observed that sequestration into polyglutamine aggregates led to loss of TDP-43-mediated splicing in the nucleus and that polyglutamine toxicity could be partially rescued by increasing expression of TDP-43. These data indicate pathologic sequestration into polyglutamine aggregates, and loss of nuclear TDP-43 function may play an unexpected role in polyglutamine disease pathogenesis. Furthermore, as Q/N domains have a strong tendency to self-aggregate and in some cases can function as prions, the identification of a Q/N domain in TDP-43 has important implications for the mechanism of pathologic aggregation of TDP-43 in ALS and other neurodegenerative diseases.

Original languageEnglish (US)
Pages (from-to)26304-26314
Number of pages11
JournalJournal of Biological Chemistry
Volume285
Issue number34
DOIs
StatePublished - Aug 20 2010

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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    Fuentealba, R. A., Udan, M., Bell, S., Wegorzewska, I., Shao, J., Diamond, M. I., Weihl, C. C., & Baloh, R. H. (2010). Interaction with polyglutamine aggregates reveals a Q/N-rich domain in TDP-43. Journal of Biological Chemistry, 285(34), 26304-26314. https://doi.org/10.1074/jbc.M110.125039