Aberrant deposition of stress granule-resident proteins linked to C9orf72-associated TDP-43 proteinopathy

Jeannie Chew, Casey Cook, Tania D Gendron, Karen Jansen-West, Giulia Del Rosso, Lillian M. Daughrity, Monica Castanedes-Casey, Aishe Kurti, Jeannette N. Stankowski, Matthew D. Disney, Jeffrey D. Rothstein, Dennis W Dickson, John D. Fryer, Yongjie Zhang, Leonard Petrucelli

Research output: Contribution to journalArticle

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Abstract

BACKGROUND: A G4C2 hexanucleotide repeat expansion in the noncoding region of C9orf72 is the major genetic cause of frontotemporal dementia and amyotrophic lateral sclerosis (c9FTD/ALS). Putative disease mechanisms underlying c9FTD/ALS include toxicity from sense G4C2 and antisense G2C4 repeat-containing RNA, and from dipeptide repeat (DPR) proteins unconventionally translated from these RNA products. METHODS: Intracerebroventricular injections with adeno-associated virus (AAV) encoding 2 or 149 G4C2 repeats were performed on postnatal day 0, followed by assessment of behavioral and neuropathological phenotypes. RESULTS: Relative to control mice, gliosis and neurodegeneration accompanied by cognitive and motor deficits were observed in (G4C2)149 mice by 6 months of age. Recapitulating key pathological hallmarks, we also demonstrate that sense and antisense RNA foci, inclusions of poly(GA), poly(GP), poly(GR), poly(PR), and poly(PA) DPR proteins, and inclusions of endogenous phosphorylated TDP-43 (pTDP-43) developed in (G4C2)149 mice but not control (G4C2)2 mice. Notably, proteins that play a role in the regulation of stress granules - RNA-protein assemblies that form in response to translational inhibition and that have been implicated in c9FTD/ALS pathogenesis - were mislocalized in (G4C2)149 mice as early as 3 months of age. Specifically, we observed the abnormal deposition of stress granule components within inclusions immunopositive for poly(GR) and pTDP-43, as well as evidence of nucleocytoplasmic transport defects. CONCLUSIONS: Our in vivo model of c9FTD/ALS is the first to robustly recapitulate hallmark features derived from both sense and antisense C9orf72 repeat-associated transcripts complete with neurodegeneration and behavioral impairments. More importantly, the early appearance of persistent pathological stress granules prior to significant pTDP-43 deposition implicates an aberrant stress granule response as a key disease mechanism driving TDP-43 proteinopathy in c9FTD/ALS.

Original languageEnglish (US)
Number of pages1
JournalMolecular neurodegeneration
Volume14
Issue number1
DOIs
StatePublished - Feb 15 2019

Fingerprint

TDP-43 Proteinopathies
Dipeptides
RNA
Proteins
Antisense RNA
Dependovirus
Gliosis
Cell Nucleus Active Transport
Phenotype
Injections

Keywords

  • Amyotrophic lateral sclerosis
  • C9orf72
  • Frontotemporal dementia
  • Neurodegeneration
  • Stress granules
  • TDP-43

ASJC Scopus subject areas

  • Molecular Biology
  • Clinical Neurology
  • Cellular and Molecular Neuroscience

Cite this

Aberrant deposition of stress granule-resident proteins linked to C9orf72-associated TDP-43 proteinopathy. / Chew, Jeannie; Cook, Casey; Gendron, Tania D; Jansen-West, Karen; Del Rosso, Giulia; Daughrity, Lillian M.; Castanedes-Casey, Monica; Kurti, Aishe; Stankowski, Jeannette N.; Disney, Matthew D.; Rothstein, Jeffrey D.; Dickson, Dennis W; Fryer, John D.; Zhang, Yongjie; Petrucelli, Leonard.

In: Molecular neurodegeneration, Vol. 14, No. 1, 15.02.2019.

Research output: Contribution to journalArticle

Chew, Jeannie ; Cook, Casey ; Gendron, Tania D ; Jansen-West, Karen ; Del Rosso, Giulia ; Daughrity, Lillian M. ; Castanedes-Casey, Monica ; Kurti, Aishe ; Stankowski, Jeannette N. ; Disney, Matthew D. ; Rothstein, Jeffrey D. ; Dickson, Dennis W ; Fryer, John D. ; Zhang, Yongjie ; Petrucelli, Leonard. / Aberrant deposition of stress granule-resident proteins linked to C9orf72-associated TDP-43 proteinopathy. In: Molecular neurodegeneration. 2019 ; Vol. 14, No. 1.
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abstract = "BACKGROUND: A G4C2 hexanucleotide repeat expansion in the noncoding region of C9orf72 is the major genetic cause of frontotemporal dementia and amyotrophic lateral sclerosis (c9FTD/ALS). Putative disease mechanisms underlying c9FTD/ALS include toxicity from sense G4C2 and antisense G2C4 repeat-containing RNA, and from dipeptide repeat (DPR) proteins unconventionally translated from these RNA products. METHODS: Intracerebroventricular injections with adeno-associated virus (AAV) encoding 2 or 149 G4C2 repeats were performed on postnatal day 0, followed by assessment of behavioral and neuropathological phenotypes. RESULTS: Relative to control mice, gliosis and neurodegeneration accompanied by cognitive and motor deficits were observed in (G4C2)149 mice by 6 months of age. Recapitulating key pathological hallmarks, we also demonstrate that sense and antisense RNA foci, inclusions of poly(GA), poly(GP), poly(GR), poly(PR), and poly(PA) DPR proteins, and inclusions of endogenous phosphorylated TDP-43 (pTDP-43) developed in (G4C2)149 mice but not control (G4C2)2 mice. Notably, proteins that play a role in the regulation of stress granules - RNA-protein assemblies that form in response to translational inhibition and that have been implicated in c9FTD/ALS pathogenesis - were mislocalized in (G4C2)149 mice as early as 3 months of age. Specifically, we observed the abnormal deposition of stress granule components within inclusions immunopositive for poly(GR) and pTDP-43, as well as evidence of nucleocytoplasmic transport defects. CONCLUSIONS: Our in vivo model of c9FTD/ALS is the first to robustly recapitulate hallmark features derived from both sense and antisense C9orf72 repeat-associated transcripts complete with neurodegeneration and behavioral impairments. More importantly, the early appearance of persistent pathological stress granules prior to significant pTDP-43 deposition implicates an aberrant stress granule response as a key disease mechanism driving TDP-43 proteinopathy in c9FTD/ALS.",
keywords = "Amyotrophic lateral sclerosis, C9orf72, Frontotemporal dementia, Neurodegeneration, Stress granules, TDP-43",
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AU - Chew, Jeannie

AU - Cook, Casey

AU - Gendron, Tania D

AU - Jansen-West, Karen

AU - Del Rosso, Giulia

AU - Daughrity, Lillian M.

AU - Castanedes-Casey, Monica

AU - Kurti, Aishe

AU - Stankowski, Jeannette N.

AU - Disney, Matthew D.

AU - Rothstein, Jeffrey D.

AU - Dickson, Dennis W

AU - Fryer, John D.

AU - Zhang, Yongjie

AU - Petrucelli, Leonard

PY - 2019/2/15

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N2 - BACKGROUND: A G4C2 hexanucleotide repeat expansion in the noncoding region of C9orf72 is the major genetic cause of frontotemporal dementia and amyotrophic lateral sclerosis (c9FTD/ALS). Putative disease mechanisms underlying c9FTD/ALS include toxicity from sense G4C2 and antisense G2C4 repeat-containing RNA, and from dipeptide repeat (DPR) proteins unconventionally translated from these RNA products. METHODS: Intracerebroventricular injections with adeno-associated virus (AAV) encoding 2 or 149 G4C2 repeats were performed on postnatal day 0, followed by assessment of behavioral and neuropathological phenotypes. RESULTS: Relative to control mice, gliosis and neurodegeneration accompanied by cognitive and motor deficits were observed in (G4C2)149 mice by 6 months of age. Recapitulating key pathological hallmarks, we also demonstrate that sense and antisense RNA foci, inclusions of poly(GA), poly(GP), poly(GR), poly(PR), and poly(PA) DPR proteins, and inclusions of endogenous phosphorylated TDP-43 (pTDP-43) developed in (G4C2)149 mice but not control (G4C2)2 mice. Notably, proteins that play a role in the regulation of stress granules - RNA-protein assemblies that form in response to translational inhibition and that have been implicated in c9FTD/ALS pathogenesis - were mislocalized in (G4C2)149 mice as early as 3 months of age. Specifically, we observed the abnormal deposition of stress granule components within inclusions immunopositive for poly(GR) and pTDP-43, as well as evidence of nucleocytoplasmic transport defects. CONCLUSIONS: Our in vivo model of c9FTD/ALS is the first to robustly recapitulate hallmark features derived from both sense and antisense C9orf72 repeat-associated transcripts complete with neurodegeneration and behavioral impairments. More importantly, the early appearance of persistent pathological stress granules prior to significant pTDP-43 deposition implicates an aberrant stress granule response as a key disease mechanism driving TDP-43 proteinopathy in c9FTD/ALS.

AB - BACKGROUND: A G4C2 hexanucleotide repeat expansion in the noncoding region of C9orf72 is the major genetic cause of frontotemporal dementia and amyotrophic lateral sclerosis (c9FTD/ALS). Putative disease mechanisms underlying c9FTD/ALS include toxicity from sense G4C2 and antisense G2C4 repeat-containing RNA, and from dipeptide repeat (DPR) proteins unconventionally translated from these RNA products. METHODS: Intracerebroventricular injections with adeno-associated virus (AAV) encoding 2 or 149 G4C2 repeats were performed on postnatal day 0, followed by assessment of behavioral and neuropathological phenotypes. RESULTS: Relative to control mice, gliosis and neurodegeneration accompanied by cognitive and motor deficits were observed in (G4C2)149 mice by 6 months of age. Recapitulating key pathological hallmarks, we also demonstrate that sense and antisense RNA foci, inclusions of poly(GA), poly(GP), poly(GR), poly(PR), and poly(PA) DPR proteins, and inclusions of endogenous phosphorylated TDP-43 (pTDP-43) developed in (G4C2)149 mice but not control (G4C2)2 mice. Notably, proteins that play a role in the regulation of stress granules - RNA-protein assemblies that form in response to translational inhibition and that have been implicated in c9FTD/ALS pathogenesis - were mislocalized in (G4C2)149 mice as early as 3 months of age. Specifically, we observed the abnormal deposition of stress granule components within inclusions immunopositive for poly(GR) and pTDP-43, as well as evidence of nucleocytoplasmic transport defects. CONCLUSIONS: Our in vivo model of c9FTD/ALS is the first to robustly recapitulate hallmark features derived from both sense and antisense C9orf72 repeat-associated transcripts complete with neurodegeneration and behavioral impairments. More importantly, the early appearance of persistent pathological stress granules prior to significant pTDP-43 deposition implicates an aberrant stress granule response as a key disease mechanism driving TDP-43 proteinopathy in c9FTD/ALS.

KW - Amyotrophic lateral sclerosis

KW - C9orf72

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KW - Neurodegeneration

KW - Stress granules

KW - TDP-43

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