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Nuclear RNA foci from C9ORF72 expansion mutation form paraspeckle-like bodies

Bajc Česnik, A; Darovic, S; Prpar Mihevc, S; Štalekar, M; Malnar, M; Motaln, H; Lee, Y-B; ... Rogelj, B; + view all (2019) Nuclear RNA foci from C9ORF72 expansion mutation form paraspeckle-like bodies. Journal of Cell Science , 132 (5) , Article 132: jcs224303. 10.1242/jcs.224303. Green open access

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Abstract

The GGGGCC (G4C2) repeat expansion mutation in the C9ORF72 gene is the most common genetic cause of frontotemporal dementia (FTD) and amyotrophic lateral sclerosis (ALS). Transcription of the repeat and formation of nuclear RNA foci, which sequester specific RNA-binding proteins, is one of the possible pathological mechanisms. Here, we show that (G4C2) n repeat RNA predominantly associates with essential paraspeckle proteins SFPQ, NONO, RBM14, FUS and hnRNPH and colocalizes with known paraspeckle-associated RNA hLinc-p21. As formation of paraspeckles in motor neurons has been associated with early phases of ALS, we investigated the extent of similarity between paraspeckles and (G4C2) n RNA foci. Overexpression of (G4C2)72 RNA results in their increased number and colocalization with SFPQ-stained nuclear bodies. These paraspeckle-like (G4C2)72 RNA foci form independently of the known paraspeckle scaffold, the long non-coding RNA NEAT1 Moreover, the knockdown of SFPQ protein in C9ORF72 expansion mutation-positive fibroblasts significantly reduces the number of (G4C2) n RNA foci. In conclusion, (G4C2) n RNA foci have characteristics of paraspeckles, which suggests that both RNA foci and paraspeckles play roles in FTD and ALS, and implies approaches for regulation of their formation.

Type: Article
Title: Nuclear RNA foci from C9ORF72 expansion mutation form paraspeckle-like bodies
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1242/jcs.224303
Publisher version: https://doi.org/10.1242/jcs.224303
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: C9ORF72, NEAT1, Paraspeckles, RNA foci, SFPQ
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology > Department of Neuromuscular Diseases
URI: https://discovery.ucl.ac.uk/id/eprint/10089396
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