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Gan P, Wang Z, Bezprozvannaya S, McAnally JR, Tan W, Li H, Bassel-Duby R, Liu N, Olson EN. RBPMS regulates cardiomyocyte contraction and cardiac function through RNA alternative splicing. Cardiovasc Res 2024; 120:56-68. [PMID: 37890031 PMCID: PMC10898938 DOI: 10.1093/cvr/cvad166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Revised: 07/20/2023] [Accepted: 09/23/2023] [Indexed: 10/29/2023] Open
Abstract
AIMS RNA binding proteins play essential roles in mediating RNA splicing and are key post-transcriptional regulators in the heart. Our recent study demonstrated that RBPMS (RNA binding protein with multiple splicing) is crucial for cardiac development through modulating mRNA splicing, but little is known about its functions in the adult heart. In this study, we aim to characterize the post-natal cardiac function of Rbpms and its mechanism of action. METHODS AND RESULTS We generated a cardiac-specific knockout mouse line and found that cardiac-specific loss of Rbpms caused severe cardiomyocyte contractile defects, leading to dilated cardiomyopathy and early lethality in adult mice. We showed by proximity-dependent biotin identification assay and mass spectrometry that RBPMS associates with spliceosome factors and other RNA binding proteins, such as RBM20, that are important in cardiac function. We performed paired-end RNA sequencing and RT-PCR and found that RBPMS regulates mRNA alternative splicing of genes associated with sarcomere structure and function, such as Ttn, Pdlim5, and Nexn, generating new protein isoforms. Using a minigene splicing reporter assay, we determined that RBPMS regulates target gene splicing through recognizing tandem intronic CAC motifs. We also showed that RBPMS knockdown in human induced pluripotent stem cell-derived cardiomyocytes impaired cardiomyocyte contraction. CONCLUSION This study identifies RBPMS as an important regulator of cardiomyocyte contraction and cardiac function by modulating sarcomeric gene alternative splicing.
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Affiliation(s)
- Peiheng Gan
- Department of Molecular Biology, Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, 6000 Harry Hines Blvd., Dallas, TX 75390, USA
| | - Zhaoning Wang
- Department of Molecular Biology, Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, 6000 Harry Hines Blvd., Dallas, TX 75390, USA
- Department of Cellular and Molecular Medicine, University of California, San Diego School of Medicine, La Jolla, CA 92093, USA
| | - Svetlana Bezprozvannaya
- Department of Molecular Biology, Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, 6000 Harry Hines Blvd., Dallas, TX 75390, USA
| | - John R McAnally
- Department of Molecular Biology, Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, 6000 Harry Hines Blvd., Dallas, TX 75390, USA
| | - Wei Tan
- Department of Molecular Biology, Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, 6000 Harry Hines Blvd., Dallas, TX 75390, USA
| | - Hui Li
- Department of Molecular Biology, Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, 6000 Harry Hines Blvd., Dallas, TX 75390, USA
| | - Rhonda Bassel-Duby
- Department of Molecular Biology, Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, 6000 Harry Hines Blvd., Dallas, TX 75390, USA
| | - Ning Liu
- Department of Molecular Biology, Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, 6000 Harry Hines Blvd., Dallas, TX 75390, USA
| | - Eric N Olson
- Department of Molecular Biology, Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, 6000 Harry Hines Blvd., Dallas, TX 75390, USA
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Harvey AB, Wolters RA, Deepe RN, Tarolli HG, Drummond JR, Trouten A, Zandi A, Barth JL, Mukherjee R, Romeo MJ, Vaena SG, Tao G, Muise-Helmericks R, Ramos PS, Norris RA, Wessels A. Epicardial deletion of Sox9 leads to myxomatous valve degeneration and identifies Cd109 as a novel gene associated with valve development. J Mol Cell Cardiol 2024; 186:16-30. [PMID: 37935281 PMCID: PMC10843603 DOI: 10.1016/j.yjmcc.2023.11.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 10/30/2023] [Accepted: 11/03/2023] [Indexed: 11/09/2023]
Abstract
Epicardial-derived cells (EPDCs) are involved in the regulation of myocardial growth and coronary vascularization and are critically important for proper development of the atrioventricular (AV) valves. SOX9 is a transcription factor expressed in a variety of epithelial and mesenchymal cells in the developing heart, including EPDCs. To determine the role of SOX9 in epicardial development, an epicardial-specific Sox9 knockout mouse model was generated. Deleting Sox9 from the epicardial cell lineage impairs the ability of EPDCs to invade both the ventricular myocardium and the developing AV valves. After birth, the mitral valves of these mice become myxomatous with associated abnormalities in extracellular matrix organization. This phenotype is reminiscent of that seen in humans with myxomatous mitral valve disease (MVD). An RNA-seq analysis was conducted in an effort to identify genes associated with this myxomatous degeneration. From this experiment, Cd109 was identified as a gene associated with myxomatous valve pathogenesis in this model. Cd109 has never been described in the context of heart development or valve disease. This study highlights the importance of SOX9 in the regulation of epicardial cell invasion-emphasizing the importance of EPDCs in regulating AV valve development and homeostasis-and reports a novel expression profile of Cd109, a gene with previously unknown relevance in heart development.
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Affiliation(s)
- Andrew B Harvey
- Department of Regenerative Medicine and Cell Biology, College of Medicine, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, USA.
| | - Renélyn A Wolters
- Department of Regenerative Medicine and Cell Biology, College of Medicine, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, USA.
| | - Raymond N Deepe
- Department of Regenerative Medicine and Cell Biology, College of Medicine, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, USA.
| | - Hannah G Tarolli
- Department of Regenerative Medicine and Cell Biology, College of Medicine, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, USA.
| | - Jenna R Drummond
- Department of Regenerative Medicine and Cell Biology, College of Medicine, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, USA.
| | - Allison Trouten
- Department of Regenerative Medicine and Cell Biology, College of Medicine, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, USA.
| | - Auva Zandi
- Department of Regenerative Medicine and Cell Biology, College of Medicine, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, USA.
| | - Jeremy L Barth
- Department of Regenerative Medicine and Cell Biology, College of Medicine, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, USA.
| | - Rupak Mukherjee
- Department of Surgery, Medical University of South Carolina, 30 Courtenay Drive, Charleston, SC 29425, USA.
| | - Martin J Romeo
- Hollings Cancer Center, Medical University of South Carolina, 86 Jonathan Lucas Street, Charleston, SC 29425, USA.
| | - Silvia G Vaena
- Hollings Cancer Center, Medical University of South Carolina, 86 Jonathan Lucas Street, Charleston, SC 29425, USA.
| | - Ge Tao
- Department of Regenerative Medicine and Cell Biology, College of Medicine, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, USA.
| | - Robin Muise-Helmericks
- Department of Regenerative Medicine and Cell Biology, College of Medicine, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, USA.
| | - Paula S Ramos
- Departments of Medicine and Public Health Sciences, Medical University of South Carolina, 96 Jonathan Lucas Street, Charleston, SC 29425, USA.
| | - Russell A Norris
- Department of Regenerative Medicine and Cell Biology, College of Medicine, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, USA.
| | - Andy Wessels
- Department of Regenerative Medicine and Cell Biology, College of Medicine, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, USA.
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3
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Pham C, Andrzejczyk K, Jurgens SJ, Lekanne Deprez R, Palm KC, Vermeer AM, Nijman J, Christiaans I, Barge-Schaapveld DQ, van Dessel PF, Beekman L, Choi SH, Lubitz SA, Skoric-Milosavljevic D, van den Bersselaar L, Jansen PR, Copier JS, Ellinor PT, Wilde AA, Bezzina CR, Lodder EM. Genetic Burden of TNNI3K in Diagnostic Testing of Patients With Dilated Cardiomyopathy and Supraventricular Arrhythmias. Circ Genom Precis Med 2023; 16:328-336. [PMID: 37199186 PMCID: PMC10426786 DOI: 10.1161/circgen.122.003975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Accepted: 04/10/2023] [Indexed: 05/19/2023]
Abstract
BACKGROUND Genetic variants in TNNI3K (troponin-I interacting kinase) have previously been associated with dilated cardiomyopathy (DCM), cardiac conduction disease, and supraventricular tachycardias. However, the link between TNNI3K variants and these cardiac phenotypes shows a lack of consensus concerning phenotype and protein function. METHODS We describe a systematic retrospective study of a cohort of patients undergoing genetic testing for cardiac arrhythmias and cardiomyopathy including TNNI3K. We further performed burden testing of TNNI3K in the UK Biobank. For 2 novel TNNI3K variants, we tested cosegregation. TNNI3K kinase function was estimated by TNNI3K autophosphorylation assays. RESULTS We demonstrate enrichment of rare coding TNNI3K variants in DCM patients in the Amsterdam cohort. In the UK Biobank, we observed an association between TNNI3K missense (but not loss-of-function) variants and DCM and atrial fibrillation. Furthermore, we demonstrate genetic segregation for 2 rare variants, TNNI3K-p.Ile512Thr and TNNI3K-p.His592Tyr, with phenotypes consisting of DCM, cardiac conduction disease, and supraventricular tachycardia, together with increased autophosphorylation. In contrast, TNNI3K-p.Arg556_Asn590del, a likely benign variant, demonstrated depleted autophosphorylation. CONCLUSIONS Our findings demonstrate an increased burden of rare coding TNNI3K variants in cardiac patients with DCM. Furthermore, we present 2 novel likely pathogenic TNNI3K variants with increased autophosphorylation, suggesting that enhanced autophosphorylation is likely to drive pathogenicity.
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Affiliation(s)
- Caroline Pham
- Department of Experimental Cardiology (C.P., K.A., S.J.J., K.C.A.P., L.B., J.S.C., C.R.B., E.M.L.), Heart Center, Amsterdam UMC location University of Amsterdam, the Netherlands
- Amsterdam Cardiovascular Sciences, Heart Failure and Arrhythmias, the Netherlands (C.P., K.A., S.J.J., K.C.A.P., L.B., J.S.C., A.A.M.W., C.R.B., E.M.L.)
| | - Karolina Andrzejczyk
- Department of Experimental Cardiology (C.P., K.A., S.J.J., K.C.A.P., L.B., J.S.C., C.R.B., E.M.L.), Heart Center, Amsterdam UMC location University of Amsterdam, the Netherlands
- Amsterdam Cardiovascular Sciences, Heart Failure and Arrhythmias, the Netherlands (C.P., K.A., S.J.J., K.C.A.P., L.B., J.S.C., A.A.M.W., C.R.B., E.M.L.)
| | - Sean J. Jurgens
- Department of Experimental Cardiology (C.P., K.A., S.J.J., K.C.A.P., L.B., J.S.C., C.R.B., E.M.L.), Heart Center, Amsterdam UMC location University of Amsterdam, the Netherlands
- Amsterdam Cardiovascular Sciences, Heart Failure and Arrhythmias, the Netherlands (C.P., K.A., S.J.J., K.C.A.P., L.B., J.S.C., A.A.M.W., C.R.B., E.M.L.)
- Cardiovascular Disease Initiative, Broad Institute of MIT and Harvard, Cambridge, MA (S.J.J., S.A.L., P.T.E.)
- Cardiovascular Research Center, Massachusetts General Hospital, Boston (S.J.J., S.A.L., P.T.E.)
| | - Ronald Lekanne Deprez
- Department of Human Genetics, Amsterdam UMC location University of Amsterdam, the Netherlands (R.L.D., A.M.C.V., J.N., D.S.-M., P.R.J., E.M.L.)
| | - Kaylin C.A. Palm
- Department of Experimental Cardiology (C.P., K.A., S.J.J., K.C.A.P., L.B., J.S.C., C.R.B., E.M.L.), Heart Center, Amsterdam UMC location University of Amsterdam, the Netherlands
- Amsterdam Cardiovascular Sciences, Heart Failure and Arrhythmias, the Netherlands (C.P., K.A., S.J.J., K.C.A.P., L.B., J.S.C., A.A.M.W., C.R.B., E.M.L.)
| | - Alexa M.C. Vermeer
- Department of Human Genetics, Amsterdam UMC location University of Amsterdam, the Netherlands (R.L.D., A.M.C.V., J.N., D.S.-M., P.R.J., E.M.L.)
| | - Janneke Nijman
- Department of Human Genetics, Amsterdam UMC location University of Amsterdam, the Netherlands (R.L.D., A.M.C.V., J.N., D.S.-M., P.R.J., E.M.L.)
| | - Imke Christiaans
- Department of Genetics, University Medical Center Groningen, University of Groningen, the Netherlands (I.C.)
| | | | - Pascal F.H.M. van Dessel
- Department of Cardiology, Thorax Center Twente, Medisch Spectrum Twente (MST), Enschede, the Netherlands (P.F.H.M.v.D.)
| | - Leander Beekman
- Department of Experimental Cardiology (C.P., K.A., S.J.J., K.C.A.P., L.B., J.S.C., C.R.B., E.M.L.), Heart Center, Amsterdam UMC location University of Amsterdam, the Netherlands
- Amsterdam Cardiovascular Sciences, Heart Failure and Arrhythmias, the Netherlands (C.P., K.A., S.J.J., K.C.A.P., L.B., J.S.C., A.A.M.W., C.R.B., E.M.L.)
| | | | - Steven A. Lubitz
- Cardiovascular Disease Initiative, Broad Institute of MIT and Harvard, Cambridge, MA (S.J.J., S.A.L., P.T.E.)
- Cardiovascular Research Center, Massachusetts General Hospital, Boston (S.J.J., S.A.L., P.T.E.)
| | - Doris Skoric-Milosavljevic
- Department of Human Genetics, Amsterdam UMC location University of Amsterdam, the Netherlands (R.L.D., A.M.C.V., J.N., D.S.-M., P.R.J., E.M.L.)
| | - Lisa van den Bersselaar
- Department of Clinical Genetics, Erasmus MC, University Medical Center, Rotterdam, the Netherlands (L.v.d.B.)
| | - Philip R. Jansen
- Department of Human Genetics, Amsterdam UMC location University of Amsterdam, the Netherlands (R.L.D., A.M.C.V., J.N., D.S.-M., P.R.J., E.M.L.)
- Amsterdam UMC location Vrije Universiteit Amsterdam, Department of Complex Trait Genetics, the Netherlands (P.R.J.)
| | - Jaël S. Copier
- Department of Experimental Cardiology (C.P., K.A., S.J.J., K.C.A.P., L.B., J.S.C., C.R.B., E.M.L.), Heart Center, Amsterdam UMC location University of Amsterdam, the Netherlands
- Amsterdam Cardiovascular Sciences, Heart Failure and Arrhythmias, the Netherlands (C.P., K.A., S.J.J., K.C.A.P., L.B., J.S.C., A.A.M.W., C.R.B., E.M.L.)
| | - Patrick T. Ellinor
- Cardiovascular Disease Initiative, Broad Institute of MIT and Harvard, Cambridge, MA (S.J.J., S.A.L., P.T.E.)
- Cardiovascular Research Center, Massachusetts General Hospital, Boston (S.J.J., S.A.L., P.T.E.)
| | - Arthur A.M. Wilde
- Department of Cardiology (A.A.M.W.), Heart Center, Amsterdam UMC location University of Amsterdam, the Netherlands
- Amsterdam Cardiovascular Sciences, Heart Failure and Arrhythmias, the Netherlands (C.P., K.A., S.J.J., K.C.A.P., L.B., J.S.C., A.A.M.W., C.R.B., E.M.L.)
| | - Connie R. Bezzina
- Department of Experimental Cardiology (C.P., K.A., S.J.J., K.C.A.P., L.B., J.S.C., C.R.B., E.M.L.), Heart Center, Amsterdam UMC location University of Amsterdam, the Netherlands
- Amsterdam Cardiovascular Sciences, Heart Failure and Arrhythmias, the Netherlands (C.P., K.A., S.J.J., K.C.A.P., L.B., J.S.C., A.A.M.W., C.R.B., E.M.L.)
| | - Elisabeth M. Lodder
- Department of Experimental Cardiology (C.P., K.A., S.J.J., K.C.A.P., L.B., J.S.C., C.R.B., E.M.L.), Heart Center, Amsterdam UMC location University of Amsterdam, the Netherlands
- Amsterdam Cardiovascular Sciences, Heart Failure and Arrhythmias, the Netherlands (C.P., K.A., S.J.J., K.C.A.P., L.B., J.S.C., A.A.M.W., C.R.B., E.M.L.)
- Department of Human Genetics, Amsterdam UMC location University of Amsterdam, the Netherlands (R.L.D., A.M.C.V., J.N., D.S.-M., P.R.J., E.M.L.)
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Swift SK, Purdy AL, Kolell ME, Andresen KG, Lahue C, Buddell T, Akins KA, Rau CD, O'Meara CC, Patterson M. Cardiomyocyte ploidy is dynamic during postnatal development and varies across genetic backgrounds. Development 2023; 150:dev201318. [PMID: 36912240 PMCID: PMC10113957 DOI: 10.1242/dev.201318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Accepted: 03/06/2023] [Indexed: 03/14/2023]
Abstract
Somatic polyploidization, an adaptation by which cells increase their DNA content to support growth, is observed in many cell types, including cardiomyocytes. Although polyploidization is believed to be beneficial, progression to a polyploid state is often accompanied by loss of proliferative capacity. Recent work suggests that genetics heavily influence cardiomyocyte ploidy. However, the developmental course by which cardiomyocytes reach their final ploidy state has only been investigated in select backgrounds. Here, we assessed cardiomyocyte number, cell cycle activity, and ploidy dynamics across two divergent mouse strains: C57BL/6J and A/J. Both strains are born and reach adulthood with comparable numbers of cardiomyocytes; however, the end composition of ploidy classes and developmental progression to reach the final state differ substantially. We expand on previous findings that identified Tnni3k as a mediator of cardiomyocyte ploidy and uncover a role for Runx1 in ploidy dynamics and cardiomyocyte cell division, in both developmental and injury contexts. These data provide novel insights into the developmental path to cardiomyocyte polyploidization and challenge the paradigm that hypertrophy is the sole mechanism for growth in the postnatal heart.
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Affiliation(s)
- Samantha K. Swift
- Medical College of Wisconsin, Department of Cell Biology, Neurobiology, and Anatomy, Milwaukee, WI 53226, USA
| | - Alexandra L. Purdy
- Medical College of Wisconsin, Department of Cell Biology, Neurobiology, and Anatomy, Milwaukee, WI 53226, USA
| | - Mary E. Kolell
- Medical College of Wisconsin, Department of Cell Biology, Neurobiology, and Anatomy, Milwaukee, WI 53226, USA
| | - Kaitlyn G. Andresen
- Medical College of Wisconsin, Department of Cell Biology, Neurobiology, and Anatomy, Milwaukee, WI 53226, USA
| | - Caitlin Lahue
- University of North Carolina School of Medicine, Department of Genetics, Chapel Hill, NC 27599, USA
| | - Tyler Buddell
- Medical College of Wisconsin, Department of Cell Biology, Neurobiology, and Anatomy, Milwaukee, WI 53226, USA
- Medical College of Wisconsin, Cardiovascular Center, Milwaukee, WI 53226, USA
| | - Kaelin A. Akins
- Medical College of Wisconsin, Department of Cell Biology, Neurobiology, and Anatomy, Milwaukee, WI 53226, USA
| | - Christoph D. Rau
- University of North Carolina School of Medicine, Department of Genetics, Chapel Hill, NC 27599, USA
| | - Caitlin C. O'Meara
- Medical College of Wisconsin, Cardiovascular Center, Milwaukee, WI 53226, USA
- Medical College of Wisconsin, Department of Physiology, Milwaukee, WI 53226, USA
| | - Michaela Patterson
- Medical College of Wisconsin, Department of Cell Biology, Neurobiology, and Anatomy, Milwaukee, WI 53226, USA
- Medical College of Wisconsin, Cardiovascular Center, Milwaukee, WI 53226, USA
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Caravia XM, Ramirez-Martinez A, Gan P, Wang F, McAnally JR, Xu L, Bassel-Duby R, Liu N, Olson EN. Loss of function of the nuclear envelope protein LEMD2 causes DNA damage–dependent cardiomyopathy. J Clin Invest 2022; 132:158897. [PMID: 36377660 PMCID: PMC9663152 DOI: 10.1172/jci158897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Accepted: 09/13/2022] [Indexed: 11/16/2022] Open
Abstract
Mutations in nuclear envelope proteins (NEPs) cause devastating genetic diseases, known as envelopathies, that primarily affect the heart and skeletal muscle. A mutation in the NEP LEM domain-containing protein 2 (LEMD2) causes severe cardiomyopathy in humans. However, the roles of LEMD2 in the heart and the pathological mechanisms responsible for its association with cardiac disease are unknown. We generated knockin (KI) mice carrying the human c.T38>G Lemd2 mutation, which causes a missense amino acid exchange (p.L13>R) in the LEM domain of the protein. These mice represent a preclinical model that phenocopies the human disease, as they developed severe dilated cardiomyopathy and cardiac fibrosis leading to premature death. At the cellular level, KI/KI cardiomyocytes exhibited disorganization of the transcriptionally silent heterochromatin associated with the nuclear envelope. Moreover, mice with cardiac-specific deletion of Lemd2 also died shortly after birth due to heart abnormalities. Cardiomyocytes lacking Lemd2 displayed nuclear envelope deformations and extensive DNA damage and apoptosis linked to p53 activation. Importantly, cardiomyocyte-specific Lemd2 gene therapy via adeno-associated virus rescued cardiac function in KI/KI mice. Together, our results reveal the essentiality of LEMD2 for genome stability and cardiac function and unveil its mechanistic association with human disease.
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Qu H, Zhang Y, Zhang W, Zhu Y, Xu R. Knockout of Cardiac Troponin I-Interacting Kinase leads to cardiac dysfunction and remodeling. Clin Exp Pharmacol Physiol 2022; 49:1169-1178. [PMID: 35781726 DOI: 10.1111/1440-1681.13699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 06/24/2022] [Accepted: 06/27/2022] [Indexed: 11/29/2022]
Abstract
Cardiac troponin I-interacting kinase (TNNI3K) is a cardiac-specific kinase that has been identified as a diagnostic marker and a therapeutic target in cardiovascular diseases. However, the biological function of TNNI3K in cardiac dysfunction and remodeling remain elusive. In the present study, a Tnni3k cardiomyocyte-specific knockout (Tnni3k-cKO) mouse model was established. Echocardiography was used to evaluate cardiac function in mice. Heart failure markers were detected using enzyme-linked immunosorbent assay. Hematoxylin and eosin staining, wheat germ agglutinin staining, Masson's trichrome staining, Sirius red staining, and TUNEL staining were used to assess histopathological changes, cardiac hypertrophy, collagen deposition, and myocardial apoptosis, respectively. Expression levels of TNNI3K, apoptosis-related proteins, and p38 mitogen-activated protein kinase were measured using Western blot analysis. Compared to wild-type controls, cardiac dysfunction and cardiac remodeling of Tnni3k-cKO mice increased gradually with age. Tnni3k-cKO mice exhibited cardiac hypertrophy, cardiac fibrosis, and cardiomyocyte apoptosis. Upregulation of cleaved caspase-3 in Tnni3k-cKO mice appeared to be related to phosphorylation and activation of the p38 mitogen-activated protein kinase signaling pathway. In conclusion, this study shows that TNNI3K is essential for cardiac development and function, providing new insights into the development of novel therapeutic strategies for cardiac diseases.
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Affiliation(s)
- Huilin Qu
- State Key Laboratory of Cardiovascular Disease, National Center for Cardiovascular Disease, Fu Wai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Yue Zhang
- State Key Laboratory of Cardiovascular Disease, National Center for Cardiovascular Disease, Fu Wai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Wei Zhang
- State Key Laboratory of Cardiovascular Disease, National Center for Cardiovascular Disease, Fu Wai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Yaxin Zhu
- State Key Laboratory of Cardiovascular Disease, National Center for Cardiovascular Disease, Fu Wai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Ruixia Xu
- State Key Laboratory of Cardiovascular Disease, National Center for Cardiovascular Disease, Fu Wai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
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7
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Gan P, Wang Z, Morales MG, Zhang Y, Bassel-Duby R, Liu N, Olson EN. RBPMS is an RNA-binding protein that mediates cardiomyocyte binucleation and cardiovascular development. Dev Cell 2022; 57:959-973.e7. [PMID: 35472321 PMCID: PMC9116735 DOI: 10.1016/j.devcel.2022.03.017] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 03/04/2022] [Accepted: 03/25/2022] [Indexed: 12/13/2022]
Abstract
Noncompaction cardiomyopathy is a common congenital cardiac disorder associated with abnormal ventricular cardiomyocyte trabeculation and impaired pump function. The genetic basis and underlying mechanisms of this disorder remain elusive. We show that the genetic deletion of RNA-binding protein with multiple splicing (Rbpms), an uncharacterized RNA-binding factor, causes perinatal lethality in mice due to congenital cardiovascular defects. The loss of Rbpms causes premature onset of cardiomyocyte binucleation and cell cycle arrest during development. Human iPSC-derived cardiomyocytes with RBPMS gene deletion have a similar blockade to cytokinesis. Sequencing analysis revealed that RBPMS plays a role in RNA splicing and influences RNAs involved in cytoskeletal signaling pathways. We found that RBPMS mediates the isoform switching of the heart-enriched LIM domain protein Pdlim5. The loss of Rbpms leads to an abnormal accumulation of Pdlim5-short isoforms, disrupting cardiomyocyte cytokinesis. Our findings connect premature cardiomyocyte binucleation to noncompaction cardiomyopathy and highlight the role of RBPMS in this process.
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Affiliation(s)
- Peiheng Gan
- Department of Molecular Biology, Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Zhaoning Wang
- Department of Molecular Biology, Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA; Department of Cellular and Molecular Medicine, University of California, San Diego School of Medicine, La Jolla, CA 92093, USA
| | - Maria Gabriela Morales
- Department of Molecular Biology, Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Yu Zhang
- Department of Molecular Biology, Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Rhonda Bassel-Duby
- Department of Molecular Biology, Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Ning Liu
- Department of Molecular Biology, Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
| | - Eric N Olson
- Department of Molecular Biology, Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
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Pham C, Muñoz-Martín N, Lodder EM. The Diverse Roles of TNNI3K in Cardiac Disease and Potential for Treatment. Int J Mol Sci 2021; 22:6422. [PMID: 34203974 PMCID: PMC8232738 DOI: 10.3390/ijms22126422] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 06/11/2021] [Accepted: 06/14/2021] [Indexed: 12/25/2022] Open
Abstract
In the two decades since the discovery of TNNI3K it has been implicated in multiple cardiac phenotypes and physiological processes. TNNI3K is an understudied kinase, which is mainly expressed in the heart. Human genetic variants in TNNI3K are associated with supraventricular arrhythmias, conduction disease, and cardiomyopathy. Furthermore, studies in mice implicate the gene in cardiac hypertrophy, cardiac regeneration, and recovery after ischemia/reperfusion injury. Several new papers on TNNI3K have been published since the last overview, broadening the clinical perspective of TNNI3K variants and our understanding of the underlying molecular biology. We here provide an overview of the role of TNNI3K in cardiomyopathy and arrhythmia covering both a clinical perspective and basic science advancements. In addition, we review the potential of TNNI3K as a target for clinical treatments in different cardiac diseases.
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Affiliation(s)
| | | | - Elisabeth M. Lodder
- Department of Clinical and Experimental Cardiology, Heart Center, University of Amsterdam, Amsterdam UMC, 1105 AZ Amsterdam, The Netherlands; (C.P.); (N.M.-M.)
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