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Learn MoreMyotonic dystrophy type 1 (DM1) is an incurable neuromuscular disorder caused by an expanded CTG repeat that is transcribed into r(CUG)exp. The RNA repeat expansion sequesters regulatory proteins such as Muscleblind-like protein 1 (MBNL1), which causes pre-mRNA splicing defects. The disease-causing r(CUG)exp has been targeted by antisense oligonucleotides, CRISPR-based approaches, and RNA-targeting small molecules. Herein, we describe a designer small molecule, Cugamycin, that targets the structure of r(CUG)exp and cleaves it in cells and in vivo. Cugamycin selectively cleaves r(CUG)exp while leaving short repeats of r(CUG) untouched. In contrast, oligonucleotides that recognize r(CUG) sequence rather than structure cleave both long and short r(CUG)-containing transcripts. In the HSALR mouse model of DM1, Cugamycin selectively ablates r(CUG)exp in disease-affected muscle. Transcriptomic, histological, and phenotypic studies demonstrate that Cugamycin broadly and specifically relieves DM1-associated defects without detectable off-targets. Thus, small molecules that bind and cleave RNA may have utility as lead chemical probes and medicines. SOURCE: Eric,T,Wang University of Florida
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