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• W4384661569 abstract "Abstract Aims Recombinant adeno-associated viruses (rAAVs) are federally approved gene delivery vectors for in vivo gene supplementation therapy. Loss-of-function truncating variants of LMNA , the coding gene for Lamin-A/C, are one of the primary causes of inherited dilate cardiomyopathy (DCM). Here we aim to study whether AAV-based LMNA supplementation could treat LMNA deficiency-triggered cardiac defects. Methods and Results We compared whole-body, cardiomyocyte-specific and genetic-mosaic mouse models that carry Lmna truncating variants at the same genetic loci and uncovered primarily a non-cell autonomous impact of Lmna on cardiomyocyte maturation. Whole-body lamin-A supplementation by rAAVs moderately rescued the cardiac defects in Lmna germline mutants. By contrast, cardiomyocyte-specific lamin-A addback failed to restore the cardiomyocyte growth defects. A Cre-loxP-based AAV vector that expresses lamin-A throughout the body but excluding the heart was able to restore cardiomyocyte growth in Lmna germline mutants. Conclusions Lmna regulates cardiomyocyte growth non-cell autonomously. Non-myocytes are the key cell targets for a successful gene therapy for LMNA -associated cardiac defects. Translational perspective LMNA truncating mutations are among the major causes of inherited DCM. AAV gene supplementation therapy is emerging as a promising strategy to treat genetic cardiomyopathy, but whether this strategy is suitable for LMNA cardiomyopathy remained unclear. Our study counterintuitively showed that the cardiomyocytes are not necessarily the correct therapeutic cell targets for AAV-based treatment of LMNA cardiomyopathy. By contrast, careful elucidation of cell-autonomous versus non-cell-autonomous gene functions is essential for the proper design of a gene supplementation therapy for cardiomyopathy. Graphical Abstract" @default.
• W4384661569 created "2023-07-20" @default.
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• W4384661569 date "2023-07-18" @default.
• W4384661569 modified "2023-09-25" @default.
• W4384661569 title "Non-cell autonomous cardiomyocyte regulation complicates gene supplementation therapy for<i>LMNA</i>cardiomyopathy" @default.
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• W4384661569 doi "https://doi.org/10.1101/2023.07.18.549413" @default.
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