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| Item Type: | Article |
|---|---|
| Title: | Prime editing corrects the dilated cardiomyopathy causing RBM20-P633L-mutation in human cardiomyocytes |
| Creators Name: | Roman, Alexandra, Zimmer, Anja, Gotthardt, Michael, Steinmetz, Lars M., Kühn, Ralf and Dang, Tu |
| Abstract: | Prime editing (PE) is an innovative next-generation gene editing tool that has therapeutic potential in post-mitotic organs, such as the human heart. However, its applicability and efficiency in non-proliferating cells, e.g., human cardiomyocytes, is not yet established. Here, we apply PE directly in cardiomyocytes differentiated from human induced pluripotent stem cells (hi-CMs) carrying dilated-cardiomyopathy-causing mutations. A target array (TA) containing the mutations LMNA(K117fs) (348–349insG), RBM20(P633L) (c.1898 C>T), and RBM20(R634Q) (c.1901 G>A) in the safe-harbor locus AAVS1 in HEK293T cells served as a screening platform for prime editing gRNAs (pegRNAs). The pegRNA screen yielded a set of efficient pegRNAs targeting the respective mutations. Using the PE4 system to correct the RBM20(P633L)-mutation, we achieved 34.8% T-to-C editing efficiency on average in homozygous P633L/P633L-hi-CMs while maintaining low off-target editing. PE restored RBM20’s nuclear localization and normalized cardiac splicing of the calcium-/calmodulin-dependent protein kinase II delta (CAMK2D) transcript. We combine a detailed pegRNA screening assay in an easy-to-transfect HEK293T system (TA-HEK) with subsequent functional validation of PE in hi-CMs carrying patient-derived mutations. This strategy yielded the first PE-mediated phenotypic rescue in a human post-mitotic model of DCM and paves the way for an in vivo strategy to treat RBM20(P633L)-mediated DCM and other inherited cardiac diseases. |
| Source: | Molecular Therapy Nucleic Acids |
| ISSN: | 2162-2531 |
| Publisher: | Cell Press / Elsevier |
| Volume: | 36 |
| Number: | 4 |
| Page Range: | 102734 |
| Number of Pages: | 1 |
| Date: | 9 December 2025 |
| Official Publication: | https://doi.org/10.1016/j.omtn.2025.102734 |
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