Abstract
Alternative splicing (AS) plays a major role in the generation of transcript diversity. In the heart, roles have been described for some AS variants, but the global impact and regulation of AS patterns are poorly understood. Here, we studied the AS profiles in heart disease, their relationship with heart development, and the regulatory mechanisms controlling AS dynamics in the mouse heart. We found that AS profiles characterized the different groups and that AS and gene expression changes affected independent genes and biological functions. Moreover, AS changes, specifically in heart disease, were associated with potential protein–protein interaction changes. While developmental transitions were mainly driven by the upregulation of MBNL1, AS changes in disease were driven by a complex regulatory network, where PTBP1 played a central role. Indeed, PTBP1 over-expression was sufficient to induce cardiac hypertrophy and diastolic dysfunction, potentially by perturbing AS patterns.
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Acknowledgements
We would like to thank CNIC Genomics and Bioinformatics Units for technical support and scientific discussion. We particularly thank Fernando Martínez for his help solving numerous technical problems that arose during the development of this study. Finally, we would like to thank Simon Bartlett for his careful writing review of the manuscript.
Funding
This study was supported by grants from the European Union [CardioNeT-ITN-289600 and CardioNext-608027 to E.L-P.], the Spanish Ministry of Economy and Competitiveness [SAF2015-65722-R and SAF2012-31451 to E.L-P.], the Science, Innovation and Universities (MCIU) [RTI2018-102084-B-I00 to F.S.C], the Carlos III Institute of Health [CPII14/00027 to E.L-P. and RD012/0042/0066 to P.G-P. and E.L-P.], and the Madrid Regional Government [2010-BMD-2321 “Fibroteam” to E.L-P.]. The study also received support from the Plan Estatal de I + D + I 2013–2016 – European Regional Development Fund (ERDF) “A way of making Europe,” Spain. The CNIC is supported by the Instituto de Salud Carlos III (ISCIII), the Ministerio de Ciencia e Innovación (MCIN), and the Pro CNIC Foundation.
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Martí-Gómez, C., Larrasa-Alonso, J., López-Olañeta, M. et al. Functional Impact and Regulation of Alternative Splicing in Mouse Heart Development and Disease. J. of Cardiovasc. Trans. Res. 15, 1239–1255 (2022). https://doi.org/10.1007/s12265-022-10244-x
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DOI: https://doi.org/10.1007/s12265-022-10244-x