TIA1 Mutations in Amyotrophic Lateral Sclerosis and Frontotemporal Dementia Promote Phase Separation and Alter Stress Granule Dynamics

Ian R. Mackenzie, Alexandra M. Nicholson, Mohona Sarkar, James Messing, Maria D. Purice, Cyril Pottier, Kavya Annu, Matt Baker, Ralph B. Perkerson, Aishe Kurti, Billie J. Matchett, Tanja Mittag, Jamshid Temirov, Ging Yuek R. Hsiung, Charles Krieger, Melissa E. Murray, Masato Kato, John D. Fryer, Leonard Petrucelli, Lorne ZinmanSandra Weintraub, Marsel Mesulam, Julia Keith, Sasha A. Zivkovic, Veronica Hirsch-Reinshagen, Raymond P. Roos, Stephan Züchner, Neill R. Graff-Radford, Ronald C. Petersen, Richard J. Caselli, Zbigniew K. Wszolek, Elizabeth Finger, Carol Lippa, David Lacomis, Heather Stewart, Dennis W. Dickson, Hong Joo Kim, Ekaterina Rogaeva, Eileen Bigio, Kevin B. Boylan, J. Paul Taylor*, Rosa Rademakers

*Corresponding author for this work

Research output: Contribution to journalArticle

204 Scopus citations

Abstract

Amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD) are age-related neurodegenerative disorders with shared genetic etiologies and overlapping clinical and pathological features. Here we studied a novel ALS/FTD family and identified the P362L mutation in the low-complexity domain (LCD) of T cell-restricted intracellular antigen-1 (TIA1). Subsequent genetic association analyses showed an increased burden of TIA1 LCD mutations in ALS patients compared to controls (p = 8.7 × 10−6). Postmortem neuropathology of five TIA1 mutations carriers showed a consistent pathological signature with numerous round, hyaline, TAR DNA-binding protein 43 (TDP-43)-positive inclusions. TIA1 mutations significantly increased the propensity of TIA1 protein to undergo phase transition. In live cells, TIA1 mutations delayed stress granule (SG) disassembly and promoted the accumulation of non-dynamic SGs that harbored TDP-43. Moreover, TDP-43 in SGs became less mobile and insoluble. The identification of TIA1 mutations in ALS/FTD reinforces the importance of RNA metabolism and SG dynamics in ALS/FTD pathogenesis.

Original languageEnglish (US)
Pages (from-to)808-816.e9
JournalNeuron
Volume95
Issue number4
DOIs
StatePublished - Aug 16 2017

Keywords

  • T cell-restricted intracellular antigen-1
  • TDP-43
  • amyotrophic lateral sclerosis
  • frontotemporal dementia
  • frontotemporal lobar degeneration
  • liquid-liquid phase separation
  • low-complexity domain
  • membrane-less organelle
  • stress granules

ASJC Scopus subject areas

  • Neuroscience(all)

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