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Dumont AA, Dumont L, Zhou D, Giguère H, Pileggi C, Harper ME, Blondin DP, Scott MS, Auger-Messier M. Cardiomyocyte-specific Srsf3 deletion reveals a mitochondrial regulatory role. FASEB J 2021; 35:e21544. [PMID: 33819356 DOI: 10.1096/fj.202002293rr] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Revised: 03/03/2021] [Accepted: 03/09/2021] [Indexed: 11/11/2022]
Abstract
Serine-rich splicing factor 3 (SRSF3) was recently reported as being necessary to preserve RNA stability via an mTOR mechanism in a cardiac mouse model in adulthood. Here, we demonstrate the link between Srsf3 and mitochondrial integrity in an embryonic cardiomyocyte-specific Srsf3 conditional knockout (cKO) mouse model. Fifteen-day-old Srsf3 cKO mice showed dramatically reduced (below 50%) survival and reduced the left ventricular systolic performance, and histological analysis of these hearts revealed a significant increase in cardiomyocyte size, confirming the severe remodeling induced by Srsf3 deletion. RNA-seq analysis of the hearts of 5-day-old Srsf3 cKO mice revealed early changes in expression levels and alternative splicing of several transcripts related to mitochondrial integrity and oxidative phosphorylation. Likewise, the levels of several protein complexes of the electron transport chain decreased, and mitochondrial complex I-driven respiration of permeabilized cardiac muscle fibers from the left ventricle was impaired. Furthermore, transmission electron microscopy analysis showed disordered mitochondrial length and cristae structure. Together with its indispensable role in the physiological maintenance of mouse hearts, these results highlight the previously unrecognized function of Srsf3 in regulating the mitochondrial integrity.
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Affiliation(s)
- Audrey-Ann Dumont
- Département de Médecine - Service de Cardiologie, Faculté de Médecine et des Sciences de la Santé, Centre de Recherche du CHUS, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Lauralyne Dumont
- Département de Médecine - Service de Cardiologie, Faculté de Médecine et des Sciences de la Santé, Centre de Recherche du CHUS, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Delong Zhou
- Département de microbiologie et d'infectiologie, Faculté de Médecine et des Sciences de la Santé, Centre de Recherche du CHUS, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Hugo Giguère
- Département de Médecine - Service de Cardiologie, Faculté de Médecine et des Sciences de la Santé, Centre de Recherche du CHUS, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Chantal Pileggi
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
| | - Mary-Ellen Harper
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
| | - Denis P Blondin
- Département de Médecine - Service de Cardiologie, Faculté de Médecine et des Sciences de la Santé, Centre de Recherche du CHUS, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Michelle S Scott
- Département de Biochimie et Génomique Fonctionnelle, Faculté de Médecine et des Sciences de la Santé, Centre de Recherche du CHUS, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Mannix Auger-Messier
- Département de Médecine - Service de Cardiologie, Faculté de Médecine et des Sciences de la Santé, Centre de Recherche du CHUS, Université de Sherbrooke, Sherbrooke, QC, Canada
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Grifone R, Shao M, Saquet A, Shi DL. RNA-Binding Protein Rbm24 as a Multifaceted Post-Transcriptional Regulator of Embryonic Lineage Differentiation and Cellular Homeostasis. Cells 2020; 9:E1891. [PMID: 32806768 PMCID: PMC7463526 DOI: 10.3390/cells9081891] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Revised: 08/06/2020] [Accepted: 08/07/2020] [Indexed: 12/12/2022] Open
Abstract
RNA-binding proteins control the metabolism of RNAs at all stages of their lifetime. They are critically required for the post-transcriptional regulation of gene expression in a wide variety of physiological and pathological processes. Rbm24 is a highly conserved RNA-binding protein that displays strongly regionalized expression patterns and exhibits dynamic changes in subcellular localization during early development. There is increasing evidence that it acts as a multifunctional regulator to switch cell fate determination and to maintain tissue homeostasis. Dysfunction of Rbm24 disrupts cell differentiation in nearly every tissue where it is expressed, such as skeletal and cardiac muscles, and different head sensory organs, but the molecular events that are affected may vary in a tissue-specific, or even a stage-specific manner. Recent works using different animal models have uncovered multiple post-transcriptional regulatory mechanisms by which Rbm24 functions in key developmental processes. In particular, it represents a major splicing factor in muscle cell development, and plays an essential role in cytoplasmic polyadenylation during lens fiber cell terminal differentiation. Here we review the advances in understanding the implication of Rbm24 during development and disease, by focusing on its regulatory roles in physiological and pathological conditions.
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Affiliation(s)
- Raphaëlle Grifone
- Developmental Biology Laboratory, CNRS-UMR7622, IBPS, Sorbonne University, 75005 Paris, France; (R.G.); (A.S.)
| | - Ming Shao
- Shandong Provincial Key Laboratory of Animal Cell and Developmental Biology, School of Life Sciences, Shandong University, Qingdao 266237, China;
| | - Audrey Saquet
- Developmental Biology Laboratory, CNRS-UMR7622, IBPS, Sorbonne University, 75005 Paris, France; (R.G.); (A.S.)
| | - De-Li Shi
- Developmental Biology Laboratory, CNRS-UMR7622, IBPS, Sorbonne University, 75005 Paris, France; (R.G.); (A.S.)
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