Transactive response DNA-binding protein 43 is enriched at the centrosome in human cells.
Brain
; 146(9): 3624-3633, 2023 09 01.
Article
en En
| MEDLINE
| ID: mdl-37410912
ABSTRACT
The centrosome, as the main microtubule organizing centre, plays key roles in cell polarity, genome stability and ciliogenesis. The recent identification of ribosomes, RNA-binding proteins and transcripts at the centrosome suggests local protein synthesis. In this context, we hypothesized that TDP-43, a highly conserved RNA binding protein involved in the pathophysiology of amyotrophic lateral sclerosis and frontotemporal lobar degeneration, could be enriched at this organelle. Using dedicated high magnification sub-diffraction microscopy on human cells, we discovered a novel localization of TDP-43 at the centrosome during all phases of the cell cycle. These results were confirmed on purified centrosomes by western blot and immunofluorescence microscopy. In addition, the co-localization of TDP-43 and pericentrin suggested a pericentriolar enrichment of the protein, leading us to hypothesize that TDP-43 might interact with local mRNAs and proteins. Supporting this hypothesis, we found four conserved centrosomal mRNAs and 16 centrosomal proteins identified as direct TDP-43 interactors. More strikingly, all the 16 proteins are implicated in the pathophysiology of TDP-43 proteinopathies, suggesting that TDP-43 dysfunction in this organelle contributes to neurodegeneration. This first description of TDP-43 centrosomal enrichment paves the way for a more comprehensive understanding of TDP-43 physiology and pathology.
Palabras clave
Texto completo:
1
Base de datos:
MEDLINE
Asunto principal:
Degeneración Lobar Frontotemporal
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Proteinopatías TDP-43
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Esclerosis Amiotrófica Lateral
Límite:
Humans
Idioma:
En
Revista:
Brain
Año:
2023
Tipo del documento:
Article
País de afiliación:
Francia