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High-fidelity dual RNA-targeting CRISPR systems for the C9ORF72 repeat RNAs

An abnormal expansion of a GGGGCC hexanucleotide repeat in the C9ORF72 gene is the most common genetic cause of amyotrophic lateral sclerosis (ALS). To date, three non-exclusive mechanisms have been proposed to explain the pathogenicity of the hexanucleotide repeat expansion, including a gain-of-function toxicity originating from the production of sense and antisense repeat-containing RNAs from the C9ORF72 gene. Given the evidence in support of a role of these repeat RNAs in C9ORF72-related ALS (C9-ALS), strategies for silencing their production hold immense promise for the disorder; however, there remains a major need for precision approaches capable of targeting both mutant repeat RNA species to effectively mitigate the neurotoxicity of the hexanucleotide repeat. One emerging platform with the potential to enable this are RNA-targeting CRISPR effector proteins, a class of enzymes that includes the Cas13 family of proteins and Cas7-11. Utilizing these two effector proteins, we now aim to develop high-fidelity CRISPR systems to silence both the sense and antisense repeat RNAs. Thus, by utilizing an innovative technology whose capabilities are uniquely suited for C9-ALS, we will develop new and permanently effective targeted gene therapies for this devastating and currently incurable disorder.
Digital Object Identifier (DOI)
Grantee: Thomas Gaj, PhD
Grant type: Research Grant
Award total: $300,000.00
Institution: The Board of Trustees of the University of Illinois Urbana-Champaign
Country: USA