1. Two FTD-ALS genes converge on the endosomal pathway to induce TDP-43 pathology and degeneration.
- Author
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Wei Shao, Todd, Tiffany W., Yanwei Wu, Jones, Caroline Y., Jimei Tong, Jansen-West, Karen, Daughrity, Lillian M., Jinyoung Park, Yuka Koike, Kurti, Aishe, Mei Yue, Castanedes-Casey, Monica, Rosso, Giulia del, Dunmore, Judith A., Alepuz, Desiree Zanetti, Oskarsson, Björn, Dickson, Dennis W., Cook, Casey N., Prudencio, Mercedes, and Gendron, Tania F.
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FRONTOTEMPORAL dementia , *AMYOTROPHIC lateral sclerosis , *DNA-binding proteins , *NEURODEGENERATION , *PROTEIN kinases , *MEDICAL genetics - Abstract
Frontotemporal dementia and amyotrophic lateral sclerosis (FTD-ALS) are associated with both a repeat expansion in the C9orf72 gene and mutations in the TANK-binding kinase 1 (TBK1) gene. We found that TBK1 is phosphorylated in response to C9orf72 poly(Gly-Ala) [poly(GA)] aggregation and sequestered into inclusions, which leads to a loss of TBK1 activity and contributes to neurodegeneration. When we reduced TBK1 activity using a TBK1-R228H (Arg228→His) mutation in mice, poly(GA)-induced phenotypes were exacerbated. These phenotypes included an increase in TAR DNA binding protein 43 (TDP-43) pathology and the accumulation of defective endosomes in poly(GA)-positive neurons. Inhibiting the endosomal pathway induced TDP-43 aggregation, which highlights the importance of this pathway and TBK1 activity in pathogenesis. This interplay between C9orf72, TBK1, and TDP-43 connects three different facets of FTD-ALS into one coherent pathway. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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