Shape Therapeutics and Rett Syndrome Research Trust Partner on AI-Designed RNA Editing Therapy for Rett Syndrome

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Shape Therapeutics and the Rett Syndrome Research Trust have announced a partnership to advance SHP-401, an investigational one-time gene therapy for Rett syndrome. Under the agreement, RSRT will fund translational studies to evaluate Shape’s RNAfix guide RNA, designed to correct the MECP2 R168X mutation—the most common causal point mutation in Rett patients, accounting for approximately 10% of cases—paired with a proprietary AAV5-derived capsid for delivery to the central nervous system. The studies will be conducted in non-human primates to characterize biodistribution and on-target editing, with the goal of generating data to support advancement toward IND-enabling studies. In a recent preclinical study, a single intravenous dose of the therapy achieved approximately 70% RNA editing of the R168X mutation throughout the brain in a mouse model, restoring full-length MeCP2 protein, substantially improving Rett-like phenotypes, and extending median lifespan from 50 days to as long as 174 days while reducing the risk of death by 88 to 93 percent. The collaboration aims to build on these results and move the program closer to clinical translation.

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Partnership funds translational studies for RNAfix guide RNA and AAV5 capsid, with promising preclinical data showing 70% editing and lifespan extension.

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