Poly(GR) impairs protein translation and stress granule dynamics in C9orf72-associated frontotemporal dementia and amyotrophic lateral sclerosis

Yong Jie Zhang, Tania F. Gendron, Mark T.W. Ebbert, Aliesha D. O’Raw, Mei Yue, Karen Jansen-West, Xu Zhang, Mercedes Prudencio, Jeannie Chew, Casey N. Cook, Lillian M. Daughrity, Jimei Tong, Yuping Song, Sarah R. Pickles, Monica Castanedes-Casey, Aishe Kurti, Rosa Rademakers, Bjorn Oskarsson, Dennis W. Dickson, Wenqian HuAaron D. Gitler, John D. Fryer, Leonard Petrucelli

Research output: Contribution to journalArticlepeer-review

197 Scopus citations


The major genetic cause of frontotemporal dementia (FTD) and amyotrophic lateral sclerosis (ALS) is a C9orf72 G4C2 repeat expansion1,2. Proposed mechanisms by which the expansion causes c9FTD/ALS include toxicity from repeat-containing RNA and from dipeptide repeat proteins translated from these transcripts. To investigate the contribution of poly(GR) dipeptide repeat proteins to c9FTD/ALS pathogenesis in a mammalian in vivo model, we generated mice that expressed GFP–(GR)100 in the brain. GFP–(GR)100 mice developed age-dependent neurodegeneration, brain atrophy, and motor and memory deficits through the accumulation of diffuse, cytoplasmic poly(GR). Poly(GR) co-localized with ribosomal subunits and the translation initiation factor eIF3η in GFP–(GR)100 mice and, of importance, in c9FTD/ALS patients. Combined with the differential expression of ribosome-associated genes in GFP–(GR)100 mice, these findings demonstrate poly(GR)-mediated ribosomal distress. Indeed, poly(GR) inhibited canonical and non-canonical protein translation in HEK293T cells, and also induced the formation of stress granules and delayed their disassembly. These data suggest that poly(GR) contributes to c9FTD/ALS by impairing protein translation and stress granule dynamics, consequently causing chronic cellular stress and preventing cells from mounting an effective stress response. Decreasing poly(GR) and/or interrupting interactions between poly(GR) and ribosomal and stress granule-associated proteins may thus represent potential therapeutic strategies to restore homeostasis.

Original languageEnglish
Pages (from-to)1136-1142
Number of pages7
JournalNature Medicine
Issue number8
StatePublished - Aug 1 2018

Bibliographical note

Publisher Copyright:
© 2018, The Author(s).

ASJC Scopus subject areas

  • General Biochemistry, Genetics and Molecular Biology


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