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Deprecated: Implicit conversion from float 225.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Cell 2017 ; 170 (5): 899-912.e10 Nephropedia Template TP
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Elimination of Toxic Microsatellite Repeat Expansion RNA by RNA-Targeting Cas9 #MMPMID28803727
Batra R; Nelles DA; Pirie E; Blue SM; Marina RJ; Wang H; Chaim IA; Thomas JD; Zhang N; Nguyen V; Aigner S; Markmiller S; Xia G; Corbett KD; Swanson MS; Yeo GW
Cell 2017[Aug]; 170 (5): 899-912.e10 PMID28803727show ga
Microsatellite repeat expansions in DNA produce pathogenic RNA species that cause dominantly inherited diseases such as myotonic dystrophy type 1 and 2 (DM1/2), Huntington?s disease, and C9orf72-linked amyotrophic lateral sclerosis (C9-ALS). Means to target these repetitive RNAs are required for diagnostic and therapeutic purposes. Here, we describe the development of a programmable CRISPR system capable of specifically visualizing and eliminating these toxic RNAs. We observe specific targeting and efficient elimination of micro-satellite repeat expansion RNAs both when exogenously expressed and in patient cells. Importantly, RNA-targeting Cas9 (RCas9) reverses hallmark features of disease including elimination of RNA foci among all conditions studied (DM1, DM2, C9-ALS, polyglutamine diseases), reduction of polyglutamine protein products, relocalization of repeat-bound proteins to resemble healthy controls, and efficient reversal of DM1-associated splicing abnormalities in patient myotubes. Finally, we report a truncated RCas9 system compatible with adeno-associated viral packaging. This effort highlights the potential of RCas9 for human therapeutics.