ALS/FTD-Associated C9ORF72 Repeat RNA Promotes Phase Transitions In Vitro and in Cells.

ALS/FTD-Associated C9ORF72 Repeat RNA Promotes Phase Transitions In Vitro and in Cells.
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DOI:
10.1016/j.celrep.2017.11.093
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发表时间:
2017-12-19
期刊:
影响因子:
8.8
通讯作者:
Ivanov P
Ivanov P
中科院分区:
生物学1区
文献类型:
--
作者:
Fay MM;Anderson PJ;Ivanov P

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Membraneless RNA granules originate via phase separation events driven by multivalent interactions. As RNA is the defining component of such granules, we examined how RNA contributes to granule assembly. Expansion of hexanucleotide GGGGCC (G4C2) repeats in the first intron of C9ORF72 is the most common genetic cause of amyotrophic lateral sclerosis and frontotemporal dementia (C9-ALS/FTD). We describe a biophysical phenomenon whereby G4C2 RNA (rG4C2) promotes the phase separation of RNA granule proteins in vitro and in cells. The ability of rG4C2 to promote phase separation is dependent on repeat length and RNA structure, as rG4C2 must assume a G-quadruplex conformation to promote granule assembly. We demonstrate a central role for RNA in promoting phase separations and implicate rG4C2 G-quadruplex structures in the pathogenesis of C9-ALS/FTD. Fay el al. report that rG4C2 G-quadruplexes cause the assembly of RNA granules in vitro and in cells. RNA structure impacts RNA granule assembly and increased GGGGCC length as seen in patients with C9ORF72-ALS/FTD causes more condensation of RNA granules, indicating RNAG-quadruplexes is a plausible C9ORF72-ALS/FTD drug target.
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