Neuron-specific proteotoxicity of mutant ataxin-3 in C. elegans: Rescue by the DAF-16 and HSF-1 pathways

Andreia Teixeira-Castro, Michael Ailion, Ana Jalles, Heather R. Brignull, Joaõ L. Vilacã, Nuno Dias, Pedro Rodrigues, Joaõ F. Oliveira, Andreia Neves-Carvalho, Richard I. Morimoto, Patrícia Maciel*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

71 Scopus citations

Abstract

The risk of developing neurodegenerative diseases increases with age. Although many of the molecular pathways regulating proteotoxic stress and longevity are well characterized, their contribution to disease susceptibility remains unclear. In this study, we describe a new Caenorhabditis elegans model of Machado-Joseph disease pathogenesis. Pan-neuronal expression of mutant ATXN3 leads to a polyQ-length dependent, neuron subtype-specific aggregation and neuronal dysfunction. Analysis of different neurons revealed a pattern of dorsal nerve cord and sensory neuron susceptibility to mutant ataxin-3 that was distinct from the aggregation and toxicity profiles of polyQ-alone proteins. This reveals that the sequences flanking the polyQ-stretch in ATXN3 have a dominant influence on cell-intrinsic neuronal factors that modulate polyQ-mediated pathogenesis. Aging influences the ATXN3 phenotypes which can be suppressed by the downregulation of the insulin/insulin growth factor-1-like signaling pathway and activation of heat shock factor-1.

Original languageEnglish (US)
Article numberddr203
Pages (from-to)2996-3009
Number of pages14
JournalHuman molecular genetics
Volume20
Issue number15
DOIs
StatePublished - Aug 2011

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Genetics(clinical)

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