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@ARTICLE{Khosravi:139127,
author = {Khosravi, Bahram and Hartmann, Hannelore and May, Stephanie
and Möhl, Christoph and Ederle, Helena and Michaelsen,
Meike and Schludi, Martin H and Dormann, Dorothee and
Edbauer, Dieter},
title = {{C}ytoplasmic poly-{GA} aggregates impair nuclear import of
{TDP}-43 in {C}9orf72 {ALS}/{FTLD}.},
journal = {Human molecular genetics},
volume = {26},
number = {4},
issn = {0964-6906},
address = {Oxford},
publisher = {Oxford Univ. Press},
reportid = {DZNE-2020-05449},
pages = {ddw432},
year = {2017},
abstract = {A repeat expansion in the non-coding region of C9orf72 gene
is the most common mutation causing frontotemporal lobar
degeneration (FTLD) and amyotrophic lateral sclerosis (ALS).
Sense and antisense transcripts are translated into
aggregating dipeptide repeat (DPR) proteins in all reading
frames (poly-GA,-GP,-GR,-PA and -PR) through an
unconventional mechanism. How these changes contribute to
cytoplasmic mislocalization and aggregation of TDP-43 and
thereby ultimately leading to neuron loss remains unclear.
The repeat RNA itself and poly-GR/PR have been linked to
impaired nucleocytoplasmic transport. Here, we show that
compact cytoplasmic poly-GA aggregates impair nuclear import
of a reporter containing the TDP-43 nuclear localization
(NLS) signal. However, a reporter containing a non-classical
PY-NLS was not affected. Moreover, poly-GA expression
prevents TNFα induced nuclear translocation of p65
suggesting that poly-GA predominantly impairs the
importin-α/β-dependent pathway. In neurons, prolonged
poly-GA expression induces partial mislocalization of TDP-43
into cytoplasmic granules. Rerouting poly-GA to the nucleus
prevented TDP-43 mislocalization, suggesting a cytoplasmic
mechanism. In rescue experiments, expression of importin-α
(KPNA3, KPNA4) or nucleoporins (NUP54, NUP62) restores the
nuclear localization of the TDP reporter. Taken together,
inhibition of nuclear import of TDP-43 by cytoplasmic
poly-GA inclusions causally links the two main aggregating
proteins in C9orf72 ALS/FTLD pathogenesis.},
keywords = {Amyotrophic Lateral Sclerosis: genetics / Amyotrophic
Lateral Sclerosis: metabolism / Amyotrophic Lateral
Sclerosis: pathology / Animals / C9orf72 Protein / DNA
Repeat Expansion / DNA-Binding Proteins: genetics /
DNA-Binding Proteins: metabolism / Frontotemporal Lobar
Degeneration: genetics / Frontotemporal Lobar Degeneration:
metabolism / Frontotemporal Lobar Degeneration: pathology /
Humans / Inclusion Bodies: genetics / Inclusion Bodies:
metabolism / Membrane Glycoproteins: genetics / Membrane
Glycoproteins: metabolism / Neurons: metabolism / Nuclear
Localization Signals: genetics / Nuclear Localization
Signals: metabolism / Nuclear Pore Complex Proteins:
genetics / Nuclear Pore Complex Proteins: metabolism /
Proteins: genetics / Proteins: metabolism / Rats / Tumor
Necrosis Factor-alpha: genetics / Tumor Necrosis
Factor-alpha: metabolism / alpha Karyopherins: genetics /
alpha Karyopherins: metabolism / C9orf72 Protein (NLM
Chemicals) / C9orf72 protein, human (NLM Chemicals) /
DNA-Binding Proteins (NLM Chemicals) / KPNA3 protein, human
(NLM Chemicals) / KPNA4 protein, human (NLM Chemicals) /
Membrane Glycoproteins (NLM Chemicals) / Nuclear
Localization Signals (NLM Chemicals) / Nuclear Pore Complex
Proteins (NLM Chemicals) / Proteins (NLM Chemicals) / TDP-43
protein, human (NLM Chemicals) / Tumor Necrosis Factor-alpha
(NLM Chemicals) / alpha Karyopherins (NLM Chemicals) /
nuclear pore protein p62 (NLM Chemicals)},
cin = {AG Edbauer / IDAF},
ddc = {570},
cid = {I:(DE-2719)1110004 / I:(DE-2719)1040200},
pnm = {342 - Disease Mechanisms and Model Systems (POF3-342)},
pid = {G:(DE-HGF)POF3-342},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:28040728},
pmc = {pmc:PMC5409121},
doi = {10.1093/hmg/ddw432},
url = {https://pub.dzne.de/record/139127},
}