A Minimal Synthetic Cleavage Module Enables Selective Degradation of Pathogenic r(CUG) Repeats in Cells

A compact synthetic Fe(II)-coordinating cleavage module programmed to target expanded r(CUG) repeats selectively degrades pathogenic DM1 RNA in cells, sparing wild-type and short-repeat transcripts.

• Why it matters: Direct RNA degradation could avoid occupancy-driven activity, but prior approaches depended on complex natural product-derived cleavage modules, limiting programmability and selectivity.
• What they did: The authors coupled a minimal Fe(II)-coordinating warhead to a small-molecule r(CUG) recognizer and tested selective degradation in DM1 patient-derived myoblasts.
• The result: In DM1 myoblasts, mutant repeat RNA degradation reduced nuclear foci, MBNL1 sequestration, and alternative pre-mRNA splicing defects, without inducing DNA damage, supporting minimal synthetic modules as replacements for complex warheads.

AI summary of the abstract · may contain errors · not medical advice · read the paper.