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SMN2 splice modulators enhance U1-pre-mRNA association and rescue SMA mice

Palacino, James and Swalley, Sue and Song, Cheng and Cheung, Atwood and Shu, Lei and Zhang, Xiaolu and Van Hoosear, Mailin and Shin, Youngah and Chin, Donovan and Gubser Keller, Caroline and Beibel, Martin and Renaud, Nicole and Salcius, Michael and Shi, Xiaoying and Hild, Marc and Servais, Rebecca and Jain, Monish and Deng, Lin and Bullock, Caroline and Mclellan, Michael and Schuierer, Sven and Murphy, Leo and Blommers, Marcel J.J. and Blaustein, Cecile and Berenshteyn, Frada and Lacoste, Arnaud and Thomas, Jason and Roma, Guglielmo and Michaud, Gregory and Tseng, Brian and Porter, Jeffrey and Myer, Vic and Tallarico, John and Hamann, Lawrence and Curtis, Daniel and Fishman, Mark and Dietrich, Bill and Dales, Natalie and Sivasankaran, Rajeev (2015) SMN2 splice modulators enhance U1-pre-mRNA association and rescue SMA mice. Nature Chemical Biology, 11 (7). pp. 511-517. ISSN 1552-4469

Abstract

Spinal muscular atrophy (SMA), which results from the loss of expression of the survival of motor neuron-1 (SMN1) gene, represents the most common genetic cause of pediatric mortality. A duplicate copy (SMN2) is inefficiently spliced, producing a truncated and unstable protein. We describe herein a potent, orally active, small-molecule enhancer of SMN2 splicing that elevates full-length SMN protein and extends survival in a severe SMA mouse model. We demonstrate that the molecular mechanism of action is via stabilization of the transient double-strand RNA structure formed by the SMN2 pre-mRNA and U1 small nuclear ribonucleic protein (snRNP) complex. The binding affinity of U1 snRNP to the 5′ splice site is increased in a sequence-selective manner, discrete from constitutive recognition. This new mechanism demonstrates the feasibility of small molecule-mediated, sequence-selective splice modulation and the potential for leveraging this strategy in other splicing diseases.

Item Type: Article
Date Deposited: 25 Nov 2017 00:45
Last Modified: 25 Jan 2019 00:45
URI: https://oak.novartis.com/id/eprint/23792

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