Using 5'-PTMs to repair mutant beta-globin transcripts.
Trans-splicing has been used to repair mutant RNA transcripts via competition for the spliceosome using pre-trans-splicing molecules, or "PTMs." Previous studies have demonstrated that functional PTMs can be designed for either 3'- or 5'-exon replacement, with a vast majority of the work to date focusing on repair of mutations within internal exons and via 3'-exon replacement. Here, we describe the first use of trans-splicing to target the first exon and intron of a therapeutically relevant gene and repair the mutant RNA by 5'-exon replacement. Our results show that 5'-PTMs can be designed to repair mutations in the beta-globin transcript involved in sickle cell anemia and beta-thalassemia while providing insight into considerations for competition between trans- versus cis-splicing in mammalian cells. Target transcripts with impaired cis-splicing capabilities, like those produced in some forms of beta-thalassemia, are more efficiently repaired via trans-splicing than targets in which cis-splicing is unaffected as with sickle beta-globin. This study reveals desirable characteristics in substrate RNAs for trans-splicing therapeutics as well as provides an opportunity for further exploration into general splicing mechanisms via 5'-PTMs.
Kierlin-Duncan
Monique N
MN
University Program in Genetics and Genomics, Duke University Medcial Center, Durham, NC 27708, USA.
Sullenger
Bruce A
BA
D002460:Cell Line; D005091:Exons; D005914:Globins / Q000235:genetics*; D006801:Humans; D007438:Introns; D009154:Mutation; D012333:RNA, Messenger / Q000235:genetics*; D017381:Spliceosomes / Q000378:metabolism; D020040:Trans-Splicing
D012333:RNA, Messenger; D005914:Globins