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Truncation and pathogenic mutations facilitate the formation of intracellular aggregates of TDP-43

Nonaka, Takashi, Kametani, Fuyuki, Arai, Tetsuaki, Akiyama, Haruhiko, Hasegawa, Masato·2009·Human Molecular Genetics

Abstract

TAR DNA binding protein of 43 kDa (TDP-43) is a major component of the ubiquitin-positive inclusions found in the brain of patients with frontotemporal lobar degeneration (FTLD-U) and amyotrophic lateral sclerosis (ALS). Here, we report that expression of TDP-43 C-terminal fragments as green fluorescent protein (GFP) fusions in SH-SY5Y cells results in the formation of abnormally phosphorylated and ubiquitinated inclusions that are similar to those found in FTLD-U and ALS. Co-expression of DsRed-tagged full-length TDP-43 with GFP-tagged C-terminal fragments of TDP-43 causes formation of cytoplasmic inclusions positive for both GFP and DsRed. Cells with GFP and DsRed positive inclusions lack normal nuclear staining for endogenous TDP-43. These results suggest that GFP-tagged C-terminal fragments of TDP-43 are bound not only to transfected DsRed-full-length TDP-43 but also to endogenous TDP-43. Endogenous TDP-43 may be recruited to cytoplasmic aggregates of TDP-43 C-terminal fragments, which results in the failure of its nuclear localization and function. Interestingly, expression of GFP-tagged TDP-43 C-terminal fragments harboring pathogenic mutations that cause ALS significantly enhances the formation of inclusions. We also identified cleavage sites of TDP-43 C-terminal fragments deposited in the FTLD-U brains using mass spectrometric analyses. We propose that generation and aggregation of phosphorylated C-terminal fragments of TDP-43 play a primary role in the formation of inclusions and resultant loss of normal TDP-43 localization, leading to neuronal degeneration in TDP-43 proteinopathy.

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Metadata

Authors
Nonaka, T., Kametani, F., Arai, T., Akiyama, H., & Hasegawa, M.
Venue
Human Molecular Genetics
Published
2009-06-10
Volume
18
Issue
18
Pages
3353-3364
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2157252269
Cited by
295
References
30
FWCI
18.00
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Truncation and pathogenic mutations facilitate the formation of intracellular aggregates of TDP-43. https://app.cochat.ai/papers/10.1093/hmg/ddp275
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Nonaka, T., Kametani, F., Arai, T., Akiyama, H., & Hasegawa, M. (2009). Truncation and pathogenic mutations facilitate the formation of intracellular aggregates of TDP-43. Human Molecular Genetics. https://doi.org/10.1093/hmg/ddp275

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