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Völkers M, Preiss T, Hentze MW. RNA-binding proteins in cardiovascular biology and disease: the beat goes on. Nat Rev Cardiol 2024; 21:361-378. [PMID: 38163813 DOI: 10.1038/s41569-023-00958-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 11/06/2023] [Indexed: 01/03/2024]
Abstract
Cardiac development and function are becoming increasingly well understood from different angles, including signalling, transcriptional and epigenetic mechanisms. By contrast, the importance of the post-transcriptional landscape of cardiac biology largely remains to be uncovered, building on the foundation of a few existing paradigms. The discovery during the past decade of hundreds of additional RNA-binding proteins in mammalian cells and organs, including the heart, is expected to accelerate progress and has raised intriguing possibilities for better understanding the intricacies of cardiac development, metabolism and adaptive alterations. In this Review, we discuss the progress and new concepts on RNA-binding proteins and RNA biology and appraise them in the context of common cardiovascular clinical conditions, from cell and organ-wide perspectives. We also discuss how a better understanding of cardiac RNA-binding proteins can fill crucial knowledge gaps in cardiology and might pave the way to developing better treatments to reduce cardiovascular morbidity and mortality.
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Affiliation(s)
- Mirko Völkers
- Department of Cardiology, Angiology and Pneumology, University Hospital Heidelberg, Heidelberg, Germany
- DZHK (German Centre for Cardiovascular Research), partner site Heidelberg/Mannheim, Heidelberg and Mannheim, Germany
| | - Thomas Preiss
- Shine-Dalgarno Centre for RNA Innovation, John Curtin School of Medical Research, Australian National University, Canberra, Australian Capital Territory, Australia
- Victor Chang Cardiac Research Institute, Sydney, New South Wales, Australia
| | - Matthias W Hentze
- European Molecular Biology Laboratory, Heidelberg, Germany.
- Molecular Medicine Partnership Unit (MMPU), Heidelberg, Germany.
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Eshraghi R, Shafie D, Raisi A, Goleij P, Mirzaei H. Circular RNAs: a small piece in the heart failure puzzle. Funct Integr Genomics 2024; 24:102. [PMID: 38760573 DOI: 10.1007/s10142-024-01386-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2024] [Revised: 04/15/2024] [Accepted: 05/13/2024] [Indexed: 05/19/2024]
Abstract
Cardiovascular disease, specifically heart failure (HF), remains a significant concern in the realm of healthcare, necessitating the development of new treatments and biomarkers. The RNA family consists of various subgroups, including microRNAs, PIWI-interacting RNAs (piRAN) and long non-coding RNAs, which have shown potential in advancing personalized healthcare for HF patients. Recent research suggests that circular RNAs, a lesser-known subgroup of RNAs, may offer a novel set of targets and biomarkers for HF. This review will discuss the biogenesis of circular RNAs, their unique characteristics relevant to HF, their role in heart function, and their potential use as biomarkers in the bloodstream. Furthermore, future research directions in this field will be outlined. The stability of exosomal circRNAs makes them suitable as biomarkers, pathogenic regulators, and potential treatments for cardiovascular diseases such as atherosclerosis, acute coronary syndrome, ischemia/reperfusion injury, HF, and peripheral artery disease. Herein, we summarized the role of circular RNAs and their exosomal forms in HF diseases.
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Affiliation(s)
- Reza Eshraghi
- Student Research Committee, Kashan University of Medical Sciences, Kashan, Iran
| | - Davood Shafie
- Heart Failure Research Center, Cardiovascular Research Institute, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Arash Raisi
- Student Research Committee, Kashan University of Medical Sciences, Kashan, Iran
| | - Pouya Goleij
- Department of Genetics, Faculty of Biology, Sana Institute of Higher Education, Sari, Iran.
- USERN Office, Kermanshah University of Medical Sciences, Kermanshah, Iran.
| | - Hamed Mirzaei
- Research Center for Biochemistry and Nutrition in Metabolic Diseases, Institute for Basic Sciences, Kashan University of Medical Sciences, Kashan, Iran.
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Gregorich ZR, Yanghai Z, Kamp TJ, Granzier H, Guo W. Mechanisms of RBM20 Cardiomyopathy: Insights From Model Systems. CIRCULATION. GENOMIC AND PRECISION MEDICINE 2024; 17:e004355. [PMID: 38288598 PMCID: PMC10923161 DOI: 10.1161/circgen.123.004355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2024]
Abstract
RBM20 (RNA-binding motif protein 20) is a vertebrate- and muscle-specific RNA-binding protein that belongs to the serine-arginine-rich family of splicing factors. The RBM20 gene was first identified as a dilated cardiomyopathy-linked gene over a decade ago. Early studies in Rbm20 knockout rodents implicated disrupted splicing of RBM20 target genes as a causative mechanism. Clinical studies show that pathogenic variants in RBM20 are linked to aggressive dilated cardiomyopathy with early onset heart failure and high mortality. Subsequent studies employing pathogenic variant knock-in animal models revealed that variants in a specific portion of the arginine-serine-rich domain in RBM20 not only disrupt splicing but also hinder nucleocytoplasmic transport and lead to the formation of RBM20 biomolecular condensates in the sarcoplasm. Conversely, mice harboring a disease-associated variant in the RRM (RNA recognition motif) do not show evidence of adverse remodeling or exhibit sudden death despite disrupted splicing of RBM20 target genes. Thus, whether disrupted splicing, biomolecular condensates, or both contribute to dilated cardiomyopathy is under debate. Beyond this, additional questions remain, such as whether there is sexual dimorphism in the presentation of RBM20 cardiomyopathy. What are the clinical features of RBM20 cardiomyopathy and why do some individuals develop more severe disease than others? In this review, we summarize the reported observations and discuss potential mechanisms of RBM20 cardiomyopathy derived from studies employing in vivo animal models and in vitro human-induced pluripotent stem cell-derived cardiomyocytes. Potential therapeutic strategies to treat RBM20 cardiomyopathy are also discussed.
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Affiliation(s)
- Zachery R. Gregorich
- Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Madison, WI
| | - Zhang Yanghai
- Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Madison, WI
| | - Timothy J. Kamp
- Cellular and Molecular Arrhythmia Research Program, University of Wisconsin-Madison, Madison, WI
- Department of Medicine, University of Wisconsin-Madison, Madison, WI
- Cardiovascular Research Center, University of Wisconsin-Madison, Madison, WI
| | - Henk Granzier
- Department of Cellular and Molecular Medicine, University of Arizona, Tucson, AZ
| | - Wei Guo
- Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Madison, WI
- Cardiovascular Research Center, University of Wisconsin-Madison, Madison, WI
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4
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Cannie DE, Protonotarios A, Bakalakos A, Syrris P, Lorenzini M, De Stavola B, Bjerregaard L, Dybro AM, Hey TM, Hansen FG, Navarro Peñalver M, Crespo-Leiro MG, Larrañaga-Moreira JM, de Frutos F, Johnson R, Slater TA, Monserrat L, Sengupta A, Mestroni L, Taylor MR, Sinagra G, Bilinska Z, Solla-Ruiz I, Arana Achaga X, Barriales-Villa R, Garcia-Pavia P, Gimeno JR, Dal Ferro M, Merlo M, Wahbi K, Fatkin D, Mogensen J, Rasmussen TB, Elliott PM. Risks of Ventricular Arrhythmia and Heart Failure in Carriers of RBM20 Variants. CIRCULATION. GENOMIC AND PRECISION MEDICINE 2023; 16:434-441. [PMID: 37593875 PMCID: PMC10581410 DOI: 10.1161/circgen.123.004059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Accepted: 06/20/2023] [Indexed: 08/19/2023]
Abstract
BACKGROUND Variants in RBM20 are reported in 2% to 6% of familial cases of dilated cardiomyopathy and may be associated with fatal ventricular arrhythmia and rapid heart failure progression. We sought to determine the risk of adverse events in RBM20 variant carriers and the impact of sex on outcomes. METHODS Consecutive probands and relatives carrying RBM20 variants were retrospectively recruited from 12 cardiomyopathy units. The primary end point was a composite of malignant ventricular arrhythmia (MVA) and end-stage heart failure (ESHF). MVA and ESHF end points were also analyzed separately and men and women compared. Left ventricular ejection fraction (LVEF) contemporary to MVA was examined. RBM20 variant carriers with left ventricular systolic dysfunction (RBM20LVSD) were compared with variant-elusive patients with idiopathic left ventricular systolic dysfunction. RESULTS Longitudinal follow-up data were available for 143 RBM20 variant carriers (71 men; median age, 35.5 years); 7 of 143 had an MVA event at baseline. Thirty of 136 without baseline MVA (22.0%) reached the primary end point, and 16 of 136 (11.8%) had new MVA with no significant difference between men and women (log-rank P=0.07 and P=0.98, respectively). Twenty of 143 (14.0%) developed ESHF (17 men and 3 women; log-rank P<0.001). Four of 10 variant carriers with available LVEF contemporary to MVA had an LVEF >35%. At 5 years, 15 of 67 (22.4%) RBM20LVSD versus 7 of 197 (3.6%) patients with idiopathic left ventricular systolic dysfunction had reached the primary end point (log-rank P<0.001). RBM20 variant carriage conferred a 6.0-fold increase in risk of the primary end point. CONCLUSIONS RBM20 variants are associated with a high risk of MVA and ESHF compared with idiopathic left ventricular systolic dysfunction. The risk of MVA in male and female RBM20 variant carriers is similar, but male sex is strongly associated with ESHF.
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Affiliation(s)
- Douglas E. Cannie
- Institute of Cardiovascular Science, University College London, United Kingdom (D.E.C., A.P., A.B., P.S., M.L., P.M.E.)
- Department of Inherited Cardiovascular Diseases, Barts Heart Centre, St Bartholomew’s Hospital, London, United Kingdom (D.E.C., A.P., A.B., M.L., P.M.E.)
| | - Alexandros Protonotarios
- Institute of Cardiovascular Science, University College London, United Kingdom (D.E.C., A.P., A.B., P.S., M.L., P.M.E.)
- Department of Inherited Cardiovascular Diseases, Barts Heart Centre, St Bartholomew’s Hospital, London, United Kingdom (D.E.C., A.P., A.B., M.L., P.M.E.)
| | - Athanasios Bakalakos
- Institute of Cardiovascular Science, University College London, United Kingdom (D.E.C., A.P., A.B., P.S., M.L., P.M.E.)
- Department of Inherited Cardiovascular Diseases, Barts Heart Centre, St Bartholomew’s Hospital, London, United Kingdom (D.E.C., A.P., A.B., M.L., P.M.E.)
| | - Petros Syrris
- Institute of Cardiovascular Science, University College London, United Kingdom (D.E.C., A.P., A.B., P.S., M.L., P.M.E.)
| | - Massimiliano Lorenzini
- Institute of Cardiovascular Science, University College London, United Kingdom (D.E.C., A.P., A.B., P.S., M.L., P.M.E.)
- Department of Inherited Cardiovascular Diseases, Barts Heart Centre, St Bartholomew’s Hospital, London, United Kingdom (D.E.C., A.P., A.B., M.L., P.M.E.)
| | - Bianca De Stavola
- Population, Policy and Practice Research and Teaching Department, UCL Great Ormond Street Institute of Child Health, United Kingdom (B.D.S.)
| | - Louise Bjerregaard
- Department of Cardiology, Aarhus University Hospital, Denmark (L.B., A.M.D., T.B.R.)
| | - Anne M. Dybro
- Department of Cardiology, Aarhus University Hospital, Denmark (L.B., A.M.D., T.B.R.)
| | - Thomas M. Hey
- Department of Cardiology, Odense University Hospital, Denmark (T.M.H., F.G.H.)
| | | | - Marina Navarro Peñalver
- Inherited Cardiac Disease Unit, Hospital Universitario Virgen Arrixaca, Murcia, Spain (M.N.P., J.R.G.)
- Centro de Investigación Biomédica en Red de Enfermedades Cardiovasculares (CIBERCV) (M.N.P.,F.d.F., R.B.-V., M.G.C.-L., J.M.L.-M., P.G.-P., J.R.G.)
- Unit for Screening Studies in Inherited Cardiovascular Diseases, Cardinal Stefan Wyszynski Institute of Cardiology, Warsaw, Poland (Z.B.)
| | - Maria G. Crespo-Leiro
- Unidad de Cardiopatías Familiares e Insuficiencia Cardíaca Avanzada, Complexo Hospitalario Universitario de A Coruña, Instituto de Investigación Biomédica de A Coruña, Servizo Galego de Saúde, Universidade da Coruña, Spain (R.B.-V., M.G.C.-L., J.M.L.-M.)
- Centro de Investigación Biomédica en Red de Enfermedades Cardiovasculares (CIBERCV) (M.N.P.,F.d.F., R.B.-V., M.G.C.-L., J.M.L.-M., P.G.-P., J.R.G.)
| | - Jose M. Larrañaga-Moreira
- Unidad de Cardiopatías Familiares e Insuficiencia Cardíaca Avanzada, Complexo Hospitalario Universitario de A Coruña, Instituto de Investigación Biomédica de A Coruña, Servizo Galego de Saúde, Universidade da Coruña, Spain (R.B.-V., M.G.C.-L., J.M.L.-M.)
- Centro de Investigación Biomédica en Red de Enfermedades Cardiovasculares (CIBERCV) (M.N.P.,F.d.F., R.B.-V., M.G.C.-L., J.M.L.-M., P.G.-P., J.R.G.)
| | - Fernando de Frutos
- European Reference Network for Rare and Low Prevalence Complex Diseases of the Heart, Amsterdam, the Netherlands (M.N.P.,F.d.F., P.G.-P., J.R.G., M.D.F., M.M., G.S.)
- Heart Failure and Inherited Cardiac Diseases Unit, Department of Cardiology, Hospital Universitario Puerta de Hierro, Instituto Investigación Sanitaria Puerta de Hierro - Segovia de Arana (IDIPHISA), Madrid, Spain (F.d.F., P.G.-P.)
- Centro de Investigación Biomédica en Red de Enfermedades Cardiovasculares (CIBERCV) (M.N.P.,F.d.F., R.B.-V., M.G.C.-L., J.M.L.-M., P.G.-P., J.R.G.)
| | - Renee Johnson
- Victor Chang Cardiac Research Institute, Darlinghurst (R.J., D.F.)
- School of Clinical Medicine, University of New South Wales (UNSW) Medicine and Health, UNSW Sydney, Kensington, Australia (R.J., D.F.)
| | - Thomas A. Slater
- Yorkshire Heart Centre, Leeds General Infirmary, United Kingdom (T.A.S., A.S.)
| | - Lorenzo Monserrat
- Medical Department, Dilemma Solutions, A Coruña, Spain (L. Monserrat)
| | - Anshuman Sengupta
- Yorkshire Heart Centre, Leeds General Infirmary, United Kingdom (T.A.S., A.S.)
| | - Luisa Mestroni
- Cardiovascular Institute and Adult Medical Genetics Program, University of Colorado Anschutz Medical Campus, Aurora (L. Mestroni, M.R.G.T.)
| | - Matthew R.G. Taylor
- Cardiovascular Institute and Adult Medical Genetics Program, University of Colorado Anschutz Medical Campus, Aurora (L. Mestroni, M.R.G.T.)
| | - Gianfranco Sinagra
- European Reference Network for Rare and Low Prevalence Complex Diseases of the Heart, Amsterdam, the Netherlands (M.N.P.,F.d.F., P.G.-P., J.R.G., M.D.F., M.M., G.S.)
- Cardiothoracovascular Department, Azienda Sanitaria Universitaria Integrata Giuliano Isontina, University of Trieste, Italy (G.S., M.D.F., M.M.)
| | - Zofia Bilinska
- Unit for Screening Studies in Inherited Cardiovascular Diseases, Cardinal Stefan Wyszynski Institute of Cardiology, Warsaw, Poland (Z.B.)
| | - Itziar Solla-Ruiz
- Department of Cardiology, Hospital Universitario Donostia, Spain (I.S.-R., X.A.A.)
| | - Xabier Arana Achaga
- Department of Cardiology, Hospital Universitario Donostia, Spain (I.S.-R., X.A.A.)
| | - Roberto Barriales-Villa
- Unidad de Cardiopatías Familiares e Insuficiencia Cardíaca Avanzada, Complexo Hospitalario Universitario de A Coruña, Instituto de Investigación Biomédica de A Coruña, Servizo Galego de Saúde, Universidade da Coruña, Spain (R.B.-V., M.G.C.-L., J.M.L.-M.)
- Centro de Investigación Biomédica en Red de Enfermedades Cardiovasculares (CIBERCV) (M.N.P.,F.d.F., R.B.-V., M.G.C.-L., J.M.L.-M., P.G.-P., J.R.G.)
| | - Pablo Garcia-Pavia
- European Reference Network for Rare and Low Prevalence Complex Diseases of the Heart, Amsterdam, the Netherlands (M.N.P.,F.d.F., P.G.-P., J.R.G., M.D.F., M.M., G.S.)
- Heart Failure and Inherited Cardiac Diseases Unit, Department of Cardiology, Hospital Universitario Puerta de Hierro, Instituto Investigación Sanitaria Puerta de Hierro - Segovia de Arana (IDIPHISA), Madrid, Spain (F.d.F., P.G.-P.)
- Centro de Investigación Biomédica en Red de Enfermedades Cardiovasculares (CIBERCV) (M.N.P.,F.d.F., R.B.-V., M.G.C.-L., J.M.L.-M., P.G.-P., J.R.G.)
| | - Juan R. Gimeno
- Inherited Cardiac Disease Unit, Hospital Universitario Virgen Arrixaca, Murcia, Spain (M.N.P., J.R.G.)
- European Reference Network for Rare and Low Prevalence Complex Diseases of the Heart, Amsterdam, the Netherlands (M.N.P.,F.d.F., P.G.-P., J.R.G., M.D.F., M.M., G.S.)
- Centro de Investigación Biomédica en Red de Enfermedades Cardiovasculares (CIBERCV) (M.N.P.,F.d.F., R.B.-V., M.G.C.-L., J.M.L.-M., P.G.-P., J.R.G.)
| | - Matteo Dal Ferro
- European Reference Network for Rare and Low Prevalence Complex Diseases of the Heart, Amsterdam, the Netherlands (M.N.P.,F.d.F., P.G.-P., J.R.G., M.D.F., M.M., G.S.)
- Cardiothoracovascular Department, Azienda Sanitaria Universitaria Integrata Giuliano Isontina, University of Trieste, Italy (G.S., M.D.F., M.M.)
| | - Marco Merlo
- European Reference Network for Rare and Low Prevalence Complex Diseases of the Heart, Amsterdam, the Netherlands (M.N.P.,F.d.F., P.G.-P., J.R.G., M.D.F., M.M., G.S.)
- Cardiothoracovascular Department, Azienda Sanitaria Universitaria Integrata Giuliano Isontina, University of Trieste, Italy (G.S., M.D.F., M.M.)
| | - Karim Wahbi
- Assistance Publique–Hôpitaux de Paris, Cochin Hospital, Cardiology Department, Université de Paris, Institut Imagine, France (K.W.)
| | - Diane Fatkin
- Victor Chang Cardiac Research Institute, Darlinghurst (R.J., D.F.)
- School of Clinical Medicine, University of New South Wales (UNSW) Medicine and Health, UNSW Sydney, Kensington, Australia (R.J., D.F.)
- Cardiology Department, St Vincent’s Hospital, Sydney, Australia (D.F.)
| | - Jens Mogensen
- Department of Cardiology, Aalborg University Hospital, Aalborg, Denmark (J.M.)
| | - Torsten B. Rasmussen
- Department of Cardiology, Aarhus University Hospital, Denmark (L.B., A.M.D., T.B.R.)
| | - Perry M. Elliott
- Institute of Cardiovascular Science, University College London, United Kingdom (D.E.C., A.P., A.B., P.S., M.L., P.M.E.)
- Department of Inherited Cardiovascular Diseases, Barts Heart Centre, St Bartholomew’s Hospital, London, United Kingdom (D.E.C., A.P., A.B., M.L., P.M.E.)
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Malakootian M, Bagheri Moghaddam M, Kalayinia S, Farrashi M, Maleki M, Sadeghipour P, Amin A. Dilated cardiomyopathy caused by a pathogenic nucleotide variant in RBM20 in an Iranian family. BMC Med Genomics 2022; 15:106. [PMID: 35527250 PMCID: PMC9079971 DOI: 10.1186/s12920-022-01262-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Accepted: 05/05/2022] [Indexed: 12/22/2022] Open
Abstract
Abstract
Introduction
Dilated cardiomyopathy (DCM) is characterized by the dilation and impaired contraction of 1 or both ventricles and can be caused by a variety of disorders. Up to 50% of idiopathic DCM cases have heritable familial diseases, and the clinical screening of family members is recommended. Identifying a genetic cause that can explain the DCM risk in the family can help with better screening planning and clinical decision-making. Whole-exome sequencing (WES) has aided significantly in the detection of causative genes in many genetically heterogeneous diseases. In the present study, we applied WES to identify the causative genetic variant in a family with heritable DCM.
Methods
WES was applied to identify genetic variants on a 26-year-old man as the proband of a family with DCM. Subsequently, Sanger sequencing was performed to confirm the variant in the patient and all the available affected and unaffected family members. The pathogenicity of the variant was evaluated through co-segregation analysis in the family and employment of in silico predictive software.
Results
WES demonstrated the missense pathogenic heterozygous nucleotide variant, c.1907G > A, (p.Arg636His, rs267607004, NM_0011343), in exon 9 of the RBM20 gene in the proband. The variant was co-segregated in all the affected family members in a heterozygous form and the unaffected family members. The in silico analysis confirmed the variant as pathogenic.
Conclusion
Pathogenic RBM20 nucleotide variants are associated with arrhythmogenic DCM. We believe that our report is the first to show an RBM20 variant in Iranian descent associated with DCM.
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Inagaki N, Hayashi T, Takei Y, Kosuge H, Suzuki S, Tanimoto K, Chikamori T, Kimura A. Pathogenic variant of RBM20 in a multiplex family with hypertrophic cardiomyopathy. Hum Genome Var 2022; 9:6. [PMID: 35181673 PMCID: PMC8857244 DOI: 10.1038/s41439-022-00183-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Revised: 12/19/2021] [Accepted: 12/23/2021] [Indexed: 02/07/2023] Open
Abstract
RBM20 is a disease-causing gene associated with dilated cardiomyopathy (DCM). The proband presented with the dilated phase of hypertrophic cardiomyopathy (HCM), and the mother also suffered from HCM. A missense variant of RBM20, p.Arg636His, previously reported as pathogenic in several families with DCM, was found in both the proband and the mother. Therefore, RBM20 p.Arg636His could be the causative variant for this familial HCM, and RBM20 might be a novel causative gene for HCM.
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Affiliation(s)
- Natsuko Inagaki
- grid.410793.80000 0001 0663 3325Department of Cardiology, Tokyo Medical University, Tokyo, Japan ,grid.410793.80000 0001 0663 3325Department of Clinical Genetics Center, Tokyo Medical University, Tokyo, Japan
| | - Takeharu Hayashi
- grid.265061.60000 0001 1516 6626Department of Physiology, Tokai University School of Medicine, Isehara, Japan ,grid.265073.50000 0001 1014 9130Department of Molecular Pathogenesis, Medical Research Institute, Tokyo Medical and Dental University, Tokyo, Japan
| | - Yasuyoshi Takei
- grid.410793.80000 0001 0663 3325Department of Cardiology, Tokyo Medical University, Tokyo, Japan
| | - Hisanori Kosuge
- grid.410793.80000 0001 0663 3325Department of Cardiology, Tokyo Medical University, Tokyo, Japan
| | - Shinji Suzuki
- grid.410793.80000 0001 0663 3325Department of Pediatrics and Adolescent Medicine, Tokyo Medical University, Tokyo, Japan
| | - Kousuke Tanimoto
- grid.265073.50000 0001 1014 9130Genome Laboratory, Medical Research Institute, Tokyo Medical and Dental University, Tokyo, Japan
| | - Taishiro Chikamori
- grid.410793.80000 0001 0663 3325Department of Cardiology, Tokyo Medical University, Tokyo, Japan
| | - Akinori Kimura
- grid.265073.50000 0001 1014 9130Department of Molecular Pathogenesis, Medical Research Institute, Tokyo Medical and Dental University, Tokyo, Japan
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Wang C, Zhang Y, Methawasin M, Braz CU, Gao-Hu J, Yang B, Strom J, Gohlke J, Hacker T, Khatib H, Granzier H, Guo W. RBM20 S639G mutation is a high genetic risk factor for premature death through RNA-protein condensates. J Mol Cell Cardiol 2022; 165:115-129. [PMID: 35041844 PMCID: PMC8940686 DOI: 10.1016/j.yjmcc.2022.01.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 01/03/2022] [Accepted: 01/09/2022] [Indexed: 12/13/2022]
Abstract
Dilated cardiomyopathy (DCM) is a heritable and genetically heterogenous disease often idiopathic and a leading cause of heart failure with high morbidity and mortality. DCM caused by RNA binding motif protein 20 (RBM20) mutations is diverse and needs a more complete mechanistic understanding. RBM20 mutation S637G (S639G in mice) is linked to severe DCM and early death in human patients. In this study, we generated a RBM20 S639G mutation knock-in (KI) mouse model to validate the function of S639G mutation and examine the underlying mechanisms. KI mice exhibited severe DCM and premature death with a ~ 50% mortality in two months old homozygous (HM) mice. KI mice had enlarged atria and increased ANP and BNP biomarkers. The S639G mutation promoted RBM20 trafficking and ribonucleoprotein (RNP) granules in the sarcoplasm. RNA Seq data revealed differentially expressed and spliced genes were associated with arrhythmia, cardiomyopathy, and sudden death. KI mice also showed a reduction of diastolic stiffness and impaired contractility at both the left ventricular (LV) chamber and cardiomyocyte levels. Our results indicate that the RBM20 S639G mutation leads to RNP granules causing severe heart failure and early death and this finding strengthens the novel concept that RBM20 cardiomyopathy is a RNP granule disease.
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Affiliation(s)
- Chunyan Wang
- Department of Animal and Dairy Sciences, University of Wisconsin, Madison, WI 53706, USA
| | - Yanghai Zhang
- Department of Animal and Dairy Sciences, University of Wisconsin, Madison, WI 53706, USA
| | - Mei Methawasin
- Department of Cellular and Molecular Medicine, University of Arizona, Tucson, AZ 85724, USA
| | - Camila Urbano Braz
- Department of Animal and Dairy Sciences, University of Wisconsin, Madison, WI 53706, USA
| | - Jeffrey Gao-Hu
- Department of Animal and Dairy Sciences, University of Wisconsin, Madison, WI 53706, USA
| | - Betty Yang
- Department of Animal and Dairy Sciences, University of Wisconsin, Madison, WI 53706, USA
| | - Joshua Strom
- Department of Cellular and Molecular Medicine, University of Arizona, Tucson, AZ 85724, USA
| | - Jochen Gohlke
- Department of Cellular and Molecular Medicine, University of Arizona, Tucson, AZ 85724, USA
| | - Timothy Hacker
- Division of Cardiovascular Medicine, Department of Medicine, University of Wisconsin School of Medicine and Public Health, Madison, WI 53706, USA
| | - Hasan Khatib
- Department of Animal and Dairy Sciences, University of Wisconsin, Madison, WI 53706, USA
| | - Henk Granzier
- Department of Cellular and Molecular Medicine, University of Arizona, Tucson, AZ 85724, USA
| | - Wei Guo
- Department of Animal and Dairy Sciences, University of Wisconsin, Madison, WI 53706, USA.
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I536T variant of RBM20 affects splicing of cardiac structural proteins that are causative for developing dilated cardiomyopathy. J Mol Med (Berl) 2022; 100:1741-1754. [PMID: 36198914 PMCID: PMC9691496 DOI: 10.1007/s00109-022-02262-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Revised: 09/20/2022] [Accepted: 09/22/2022] [Indexed: 01/05/2023]
Abstract
RBM20 is one of the genes predisposing to dilated cardiomyopathy (DCM). Variants in the RS domain have been reported in many DCM patients, but the pathogenicity of variants within the RNA-recognition motif remains unknown. Two human patients with the I536T-RBM20 variant without an apparent DCM phenotype were identified in sudden death cohorts. A splicing reporter assay was performed, and an I538T knock-in mouse model (Rbm20I538T) was generated to determine the significance of this variant. The reporter assay demonstrated that the human I536T variant affected the TTN splicing pattern compared to wild-type. In the mouse experiments, Rbm20I538T mice showed different splicing patterns in Ttn, Ldb3, Camk2d, and Ryr2. The expressions of Casq1, Mybpc2, and Myot were upregulated in Rbm20I538T mice, but Rbm20I538T mice showed neither DCM nor cardiac dysfunction on histopathological examination and ultrasound echocardiography. The I536T-RBM20 (I538T-Rbm20) variant changes gene splicing and affects gene expression, but the splicing and expression changes in Ttn and Ca handling genes such as Casq1, Camk2d, and Ryr2 do not cause DCM morphology in the mouse model. KEY MESSAGES: • Two human patients with the I536T-RBM20 variant without a DCM phenotype were identified. • A splicing reporter assay demonstrated that the variant affected the TTN splicing. • Rbm20I538T mice showed neither DCM nor cardiac dysfunction. • Rbm20I538T mice showed different splicing patterns and the gene expressions.
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9
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Fenix AM, Miyaoka Y, Bertero A, Blue SM, Spindler MJ, Tan KKB, Perez-Bermejo JA, Chan AH, Mayerl SJ, Nguyen TD, Russell CR, Lizarraga PP, Truong A, So PL, Kulkarni A, Chetal K, Sathe S, Sniadecki NJ, Yeo GW, Murry CE, Conklin BR, Salomonis N. Gain-of-function cardiomyopathic mutations in RBM20 rewire splicing regulation and re-distribute ribonucleoprotein granules within processing bodies. Nat Commun 2021; 12:6324. [PMID: 34732726 PMCID: PMC8566601 DOI: 10.1038/s41467-021-26623-y] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2021] [Accepted: 09/22/2021] [Indexed: 12/16/2022] Open
Abstract
Mutations in the cardiac splicing factor RBM20 lead to malignant dilated cardiomyopathy (DCM). To understand the mechanism of RBM20-associated DCM, we engineered isogenic iPSCs with DCM-associated missense mutations in RBM20 as well as RBM20 knockout (KO) iPSCs. iPSC-derived engineered heart tissues made from these cell lines recapitulate contractile dysfunction of RBM20-associated DCM and reveal greater dysfunction with missense mutations than KO. Analysis of RBM20 RNA binding by eCLIP reveals a gain-of-function preference of mutant RBM20 for 3' UTR sequences that are shared with amyotrophic lateral sclerosis (ALS) and processing-body associated RNA binding proteins (FUS, DDX6). Deep RNA sequencing reveals that the RBM20 R636S mutant has unique gene, splicing, polyadenylation and circular RNA defects that differ from RBM20 KO. Super-resolution microscopy verifies that mutant RBM20 maintains very limited nuclear localization potential; rather, the mutant protein associates with cytoplasmic processing bodies (DDX6) under basal conditions, and with stress granules (G3BP1) following acute stress. Taken together, our results highlight a pathogenic mechanism in cardiac disease through splicing-dependent and -independent pathways.
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Affiliation(s)
- Aidan M Fenix
- Department of Laboratory Medicine and Pathology, University of Washington, 1959 NE Pacific Street, Seattle, WA, 98195, USA
- Center for Cardiovascular Biology, University of Washington, 850 Republican Street, Brotman Building, Seattle, WA, 98109, USA
- Institute for Stem Cell and Regenerative Medicine, University of Washington, 850 Republican Street, Seattle, WA, 98109, USA
| | - Yuichiro Miyaoka
- Regenerative Medicine Project, Tokyo Metropolitan Institute of Medical Science, Tokyo, 156-8506, Japan
- Gladstone Institutes, 1650 Owens St, San Francisco, CA, 94158, USA
| | - Alessandro Bertero
- Department of Laboratory Medicine and Pathology, University of Washington, 1959 NE Pacific Street, Seattle, WA, 98195, USA
- Center for Cardiovascular Biology, University of Washington, 850 Republican Street, Brotman Building, Seattle, WA, 98109, USA
- Institute for Stem Cell and Regenerative Medicine, University of Washington, 850 Republican Street, Seattle, WA, 98109, USA
| | - Steven M Blue
- Department of Cellular and Molecular Medicine, Stem Cell Program, and Institute for Genomic Medicine, University of California San Diego, La Jolla, CA, 92093, USA
| | | | - Kenneth K B Tan
- Gladstone Institutes, 1650 Owens St, San Francisco, CA, 94158, USA
| | | | - Amanda H Chan
- Gladstone Institutes, 1650 Owens St, San Francisco, CA, 94158, USA
| | - Steven J Mayerl
- Gladstone Institutes, 1650 Owens St, San Francisco, CA, 94158, USA
| | - Trieu D Nguyen
- Gladstone Institutes, 1650 Owens St, San Francisco, CA, 94158, USA
| | | | | | - Annie Truong
- Gladstone Institutes, 1650 Owens St, San Francisco, CA, 94158, USA
| | - Po-Lin So
- Gladstone Institutes, 1650 Owens St, San Francisco, CA, 94158, USA
| | - Aishwarya Kulkarni
- Department of Electrical Engineering and Computer Science, University of Cincinnati, Cincinnati, OH, 45221, USA
- Division of Biomedical Informatics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, 45229, USA
| | - Kashish Chetal
- Division of Biomedical Informatics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, 45229, USA
| | - Shashank Sathe
- Department of Cellular and Molecular Medicine, Stem Cell Program, and Institute for Genomic Medicine, University of California San Diego, La Jolla, CA, 92093, USA
| | - Nathan J Sniadecki
- Department of Laboratory Medicine and Pathology, University of Washington, 1959 NE Pacific Street, Seattle, WA, 98195, USA
- Center for Cardiovascular Biology, University of Washington, 850 Republican Street, Brotman Building, Seattle, WA, 98109, USA
- Institute for Stem Cell and Regenerative Medicine, University of Washington, 850 Republican Street, Seattle, WA, 98109, USA
- Department of Mechanical Engineering, University of Washington, 3720 15th Avenue NE, Seattle, WA, 98105, USA
- Department of Bioengineering, University of Washington, 3720 15th Avenue NE, Seattle, WA, 98105, USA
| | - Gene W Yeo
- Department of Cellular and Molecular Medicine, Stem Cell Program, and Institute for Genomic Medicine, University of California San Diego, La Jolla, CA, 92093, USA
| | - Charles E Murry
- Department of Laboratory Medicine and Pathology, University of Washington, 1959 NE Pacific Street, Seattle, WA, 98195, USA.
- Center for Cardiovascular Biology, University of Washington, 850 Republican Street, Brotman Building, Seattle, WA, 98109, USA.
- Institute for Stem Cell and Regenerative Medicine, University of Washington, 850 Republican Street, Seattle, WA, 98109, USA.
- Department of Bioengineering, University of Washington, 3720 15th Avenue NE, Seattle, WA, 98105, USA.
- Department of Medicine/Cardiology, University of Washington, 1959 NE Pacific Street, Seattle, WA, 98195, USA.
- Sana Biotechnology, 188 E Blaine Street, Seattle, WA, 98102, USA.
| | - Bruce R Conklin
- Gladstone Institutes, 1650 Owens St, San Francisco, CA, 94158, USA.
- Department of Medicine, Cellular and Molecular Pharmacology, and Ophthalmology, University of California San Francisco, San Francisco, CA, 94158, USA.
| | - Nathan Salomonis
- Division of Biomedical Informatics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, 45229, USA.
- Department of Pediatrics, University of Cincinnati, Cincinnati, OH, 45229, USA.
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10
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Crocini C, Gotthardt M. Cardiac sarcomere mechanics in health and disease. Biophys Rev 2021; 13:637-652. [PMID: 34745372 PMCID: PMC8553709 DOI: 10.1007/s12551-021-00840-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Accepted: 08/27/2021] [Indexed: 12/23/2022] Open
Abstract
The sarcomere is the fundamental structural and functional unit of striated muscle and is directly responsible for most of its mechanical properties. The sarcomere generates active or contractile forces and determines the passive or elastic properties of striated muscle. In the heart, mutations in sarcomeric proteins are responsible for the majority of genetically inherited cardiomyopathies. Here, we review the major determinants of cardiac sarcomere mechanics including the key structural components that contribute to active and passive tension. We dissect the molecular and structural basis of active force generation, including sarcomere composition, structure, activation, and relaxation. We then explore the giant sarcomere-resident protein titin, the major contributor to cardiac passive tension. We discuss sarcomere dynamics exemplified by the regulation of titin-based stiffness and the titin life cycle. Finally, we provide an overview of therapeutic strategies that target the sarcomere to improve cardiac contraction and filling.
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Affiliation(s)
- Claudia Crocini
- Max Delbrück Center for Molecular Medicine in the Helmholtz Association (MDC), Neuromuscular and Cardiovascular Cell Biology, Berlin, Germany
- German Center for Cardiovascular Research (DZHK) Partner Site Berlin, Berlin, Germany
- BioFrontiers Institute & Department of Molecular and Cellular Development, University of Colorado Boulder, Boulder, USA
| | - Michael Gotthardt
- Max Delbrück Center for Molecular Medicine in the Helmholtz Association (MDC), Neuromuscular and Cardiovascular Cell Biology, Berlin, Germany
- German Center for Cardiovascular Research (DZHK) Partner Site Berlin, Berlin, Germany
- Charité-Universitätsmedizin Berlin, 10117 Berlin, Germany
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11
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RBM20-Related Cardiomyopathy: Current Understanding and Future Options. J Clin Med 2021; 10:jcm10184101. [PMID: 34575212 PMCID: PMC8468976 DOI: 10.3390/jcm10184101] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Revised: 09/07/2021] [Accepted: 09/08/2021] [Indexed: 12/13/2022] Open
Abstract
Splice regulators play an essential role in the transcriptomic diversity of all eukaryotic cell types and organ systems. Recent evidence suggests a contribution of splice-regulatory networks in many diseases, such as cardiomyopathies. Adaptive splice regulators, such as RNA-binding motif protein 20 (RBM20) determine the physiological mRNA landscape formation, and rare variants in the RBM20 gene explain up to 6% of genetic dilated cardiomyopathy (DCM) cases. With ample knowledge from RBM20-deficient mice, rats, swine and induced pluripotent stem cells (iPSCs), the downstream targets and quantitative effects on splicing are now well-defined and the prerequisites for corrective therapeutic approaches are set. This review article highlights some of the recent advances in the field, ranging from aspects of granule formation to 3D genome architectures underlying RBM20-related cardiomyopathy. Promising therapeutic strategies are presented and put into context with the pathophysiological characteristics of RBM20-related diseases.
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12
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Abstract
PURPOSE OF REVIEW This review aims to give an update on recent findings related to the cardiac splicing factor RNA-binding motif protein 20 (RBM20) and RBM20 cardiomyopathy, a form of dilated cardiomyopathy caused by mutations in RBM20. RECENT FINDINGS While most research on RBM20 splicing targets has focused on titin (TTN), multiple studies over the last years have shown that other splicing targets of RBM20 including Ca2+/calmodulin-dependent kinase IIδ (CAMK2D) might be critically involved in the development of RBM20 cardiomyopathy. In this regard, loss of RBM20 causes an abnormal intracellular calcium handling, which may relate to the arrhythmogenic presentation of RBM20 cardiomyopathy. In addition, RBM20 presents clinically in a highly gender-specific manner, with male patients suffering from an earlier disease onset and a more severe disease progression. Further research on RBM20, and treatment of RBM20 cardiomyopathy, will need to consider both the multitude and relative contribution of the different splicing targets and related pathways, as well as gender differences.
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Malignant Arrhythmogenic Role Associated with RBM20: A Comprehensive Interpretation Focused on a Personalized Approach. J Pers Med 2021; 11:jpm11020130. [PMID: 33671899 PMCID: PMC7918949 DOI: 10.3390/jpm11020130] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 02/08/2021] [Accepted: 02/10/2021] [Indexed: 12/17/2022] Open
Abstract
The RBM20 gene encodes the muscle-specific splicing factor RNA-binding motif 20, a regulator of heart-specific alternative splicing. Nearly 40 potentially deleterious variants in RBM20 have been reported in the last ten years, being found to be associated with highly arrhythmogenic events in familial dilated cardiomyopathy. Frequently, malignant arrhythmias can be a primary manifestation of disease. The early recognition of arrhythmic genotypes is crucial in avoiding lethal episodes, as it may have an impact on the adoption of personalized preventive measures. Our study performs a comprehensive update of data concerning rare variants in RBM20 that are associated with malignant arrhythmogenic phenotypes with a focus on personalized medicine.
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Hey TM, Rasmussen TB, Madsen T, Aagaard MM, Harbo M, Mølgaard H, Nielsen SK, Haas J, Meder B, Møller JE, Eiskjær H, Mogensen J. Clinical and Genetic Investigations of 109 Index Patients With Dilated Cardiomyopathy and 445 of Their Relatives. Circ Heart Fail 2020; 13:e006701. [PMID: 33019804 DOI: 10.1161/circheartfailure.119.006701] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND It was the aim to investigate the frequency and genetic basis of dilated cardiomyopathy (DCM) among relatives of index patients with unexplained heart failure at a tertiary referral center. METHODS Clinical investigations were performed in 109 DCM index patients and 445 of their relatives. All index patients underwent genetic investigations of 76 disease-associated DCM genes. A family history of DCM occurred in 11% (n=12) while clinical investigations identified familial DCM in a total of 32% (n=35). One-fifth of all relatives (n=95) had DCM of whom 60% (n=57) had symptoms of heart failure at diagnosis, whereas 40% (n=38) were asymptomatic. Symptomatic relatives had a shorter event-free survival than asymptomatic DCM relatives (P<0.001). RESULTS Genetic investigations identified 43 pathogenic (n=27) or likely pathogenic (n=16) variants according to the American College of Medical Genetics and Genomics and the Association for Molecular Pathology criteria. Forty-four percent (n=48/109) of index patients carried a pathogenic/likely pathogenic variant of whom 36% (n=27/74) had sporadic DCM, whereas 60% (21/35) were familial cases. Thirteen of the pathogenic/likely pathogenic variants were also present in ≥7 affected individuals and thereby considered to be of sufficient high confidence for use in predictive genetic testing. CONCLUSIONS A family history of DCM identified only 34% (n=12/35) of hereditary DCM, whereas systematic clinical screening identified the remaining 66% (n=23) of DCM families. This emphasized the importance of clinical investigations to identify familial DCM. The high number of pathogenic/likely pathogenic variants identified in familial DCM provides a firm basis for offering genetic investigations in affected families. This should also be considered in sporadic cases since adequate family evaluation may not always be possible and the results of the genetic investigations may carry prognostic information with an impact on individual management.
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Affiliation(s)
- Thomas M Hey
- Department of Cardiology, Odense University Hospital, Denmark (T.M.H., S.K.N., J.E.M., J.M.)
- Odense Patient Data Explorative Network (OPEN), Odense University Hospital, Denmark (T.M.H., .K.N., J.E.M., J.M.)
| | - Torsten B Rasmussen
- Department of Cardiology, Aarhus University Hospital, Denmark (T.B.R., H.M., H.E.)
| | - Trine Madsen
- Department of Cardiology Aalborg University Hospital, Denmark (T.M.)
| | | | - Maria Harbo
- Department of Clinical Genetics, Vejle Hospital, Denmark (M.H., M.M.A.)
| | - Henning Mølgaard
- Department of Cardiology, Aarhus University Hospital, Denmark (T.B.R., H.M., H.E.)
| | - Søren K Nielsen
- Department of Cardiology, Odense University Hospital, Denmark (T.M.H., S.K.N., J.E.M., J.M.)
- Odense Patient Data Explorative Network (OPEN), Odense University Hospital, Denmark (T.M.H., .K.N., J.E.M., J.M.)
| | - Jan Haas
- Institue for Cardiomyopathies Heidelberg, Department of Internal Medicine III (J.H., B.M.), University of Heidelberg, Germany
- DZHK (German Centre for Cardiovascular Research), Germany (J.H., B.M.)
| | - Benjamin Meder
- Institue for Cardiomyopathies Heidelberg, Department of Internal Medicine III (J.H., B.M.), University of Heidelberg, Germany
- Klaus Tschira Institute für Computational Cardiology (B.M.), University of Heidelberg, Germany
- DZHK (German Centre for Cardiovascular Research), Germany (J.H., B.M.)
| | - Jacob E Møller
- Department of Cardiology, Odense University Hospital, Denmark (T.M.H., S.K.N., J.E.M., J.M.)
- Odense Patient Data Explorative Network (OPEN), Odense University Hospital, Denmark (T.M.H., .K.N., J.E.M., J.M.)
| | - Hans Eiskjær
- Department of Cardiology, Aarhus University Hospital, Denmark (T.B.R., H.M., H.E.)
| | - Jens Mogensen
- Department of Cardiology, Odense University Hospital, Denmark (T.M.H., S.K.N., J.E.M., J.M.)
- Odense Patient Data Explorative Network (OPEN), Odense University Hospital, Denmark (T.M.H., .K.N., J.E.M., J.M.)
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15
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Upadhyay SK, Mackereth CD. Structural basis of UCUU RNA motif recognition by splicing factor RBM20. Nucleic Acids Res 2020; 48:4538-4550. [PMID: 32187365 PMCID: PMC7192616 DOI: 10.1093/nar/gkaa168] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Revised: 02/28/2020] [Accepted: 03/07/2020] [Indexed: 12/16/2022] Open
Abstract
The vertebrate splicing factor RBM20 (RNA binding motif protein 20) regulates protein isoforms important for heart development and function, with mutations in the gene linked to cardiomyopathy. Previous studies have identified the four nucleotide RNA motif UCUU as a common element in pre-mRNA targeted by RBM20. Here, we have determined the structure of the RNA Recognition Motif (RRM) domain from mouse RBM20 bound to RNA containing a UCUU sequence. The atomic details show that the RRM domain spans a larger region than initially proposed in order to interact with the complete UCUU motif, with a well-folded C-terminal helix encoded by exon 8 critical for high affinity binding. This helix only forms upon binding RNA with the final uracil, and removing the helix reduces affinity as well as specificity. We therefore find that RBM20 uses a coupled folding-binding mechanism by the C-terminal helix to specifically recognize the UCUU RNA motif.
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Affiliation(s)
| | - Cameron D Mackereth
- Univ. Bordeaux, Institut Européen de Chimie et Biologie, 2 rue Robert Escarpit, 33607 Pessac Cedex, France.,Inserm U1212, CNRS UMR5320, ARNA Laboratory, 146 rue Léo Saignat, 33076 Bordeaux Cedex, France
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16
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Gao C, Wang Y. mRNA Metabolism in Cardiac Development and Disease: Life After Transcription. Physiol Rev 2020; 100:673-694. [PMID: 31751167 PMCID: PMC7327233 DOI: 10.1152/physrev.00007.2019] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Revised: 09/06/2019] [Accepted: 10/30/2019] [Indexed: 02/06/2023] Open
Abstract
The central dogma of molecular biology illustrates the importance of mRNAs as critical mediators between genetic information encoded at the DNA level and proteomes/metabolomes that determine the diverse functional outcome at the cellular and organ levels. Although the total number of protein-producing (coding) genes in the mammalian genome is ~20,000, it is evident that the intricate processes of cardiac development and the highly regulated physiological regulation in the normal heart, as well as the complex manifestation of pathological remodeling in a diseased heart, would require a much higher degree of complexity at the transcriptome level and beyond. Indeed, in addition to an extensive regulatory scheme implemented at the level of transcription, the complexity of transcript processing following transcription is dramatically increased. RNA processing includes post-transcriptional modification, alternative splicing, editing and transportation, ribosomal loading, and degradation. While transcriptional control of cardiac genes has been a major focus of investigation in recent decades, a great deal of progress has recently been made in our understanding of how post-transcriptional regulation of mRNA contributes to transcriptome complexity. In this review, we highlight some of the key molecular processes and major players in RNA maturation and post-transcriptional regulation. In addition, we provide an update to the recent progress made in the discovery of RNA processing regulators implicated in cardiac development and disease. While post-transcriptional modulation is a complex and challenging problem to study, recent technological advancements are paving the way for a new era of exciting discoveries and potential clinical translation in the context of cardiac biology and heart disease.
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Affiliation(s)
- Chen Gao
- Departments of Anesthesiology, Medicine, and Physiology, David Geffen School of Medicine, University of California at Los Angeles, Los Angeles, California
| | - Yibin Wang
- Departments of Anesthesiology, Medicine, and Physiology, David Geffen School of Medicine, University of California at Los Angeles, Los Angeles, California
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17
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Sun Q, Guo J, Hao C, Guo R, Hu X, Chen Y, Yang W, Li W, Feng Y. Whole-exome sequencing reveals two de novo variants in the RBM20 gene in two Chinese patients with left ventricular non-compaction cardiomyopathy. Pediatr Investig 2020; 4:11-16. [PMID: 32851336 PMCID: PMC7331393 DOI: 10.1002/ped4.12183] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Accepted: 01/31/2020] [Indexed: 11/12/2022] Open
Abstract
IMPORTANCE Pathogenic variants in the RBM20 gene are associated with aggressive dilated cardiomyopathy (DCM). Recently, RBM20 was found to be associated with left ventricular non-compaction cardiomyopathy (LVNC). Thus far, only five families with LVNC have been reported to carry variants in RBM20. It remains unknown whether the variants in RBM20 associated with DCM can also cause LVNC. OBJECTIVE To elucidate the causative RBM20 variant in two unrelated patients with both LVNC and DCM, and to identify the clinical characteristics associated with variants in RBM20. METHODS Trio whole-exome sequencing (WES) was performed. Variants were filtered and classified in accordance with the guidelines of the American College of Medical Genetics and Genomics (ACMG). RESULTS We identified two distinct de novo variants in RBM20 (one per patient) in these two patients with LVNC. Both variants have been reported in patients with DCM, without the LVNC phenotype. Patient 1 was an 11-year-old girl who had DCM, LVNC, and heart failure; the ratio of noncompacted-to-compacted myocardium was 2.7:1. A de novo heterozygous variant c.1907G>A (p.Arg636His) in exon 9 was identified in this patient. Patient 2 was a 13-year-old boy who had clinical phenotypes identical to those of Patient 1; the ratio of noncompacted-to-compacted myocardium was 3.2:1 in this patient. WES revealed a de novo heterozygous variant c.1909A>G (p.Ser637Gly) in exon 9. Both variants were previously characterized as pathogenic, and our study classified them as pathogenic variants based on the ACMG guidelines. INTERPRETATION We found that two patients with LVNC had variants in RBM20. Our results extended the clinical spectrum of the two RBM20 variants and illustrated that the same variant in RBM20 can cause DCM, with or without the LVNC phenotype.
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Affiliation(s)
- Qiqing Sun
- Department of CardiologyChildren’s Hospital Affiliated to Zhengzhou University, Henan Children’s Hospital, Zhengzhou Children’s HospitalZhengzhouChina
| | - Jun Guo
- Beijing Key Laboratory for Genetics of Birth Defects, Beijing Pediatric Research Institute; MOE Key Laboratory of Major Diseases in Children; Genetics and Birth Defects Control Center, Beijing Children’s HospitalCapital Medical University, National Center for Children’s HealthBeijingChina
- Henan Key Laboratory of Pediatric Inherited & Metabolic DiseasesHenan Children’s HospitalZhengzhou Hospital of Beijing Children’s HospitalZhengzhouChina
| | - Chanjuan Hao
- Beijing Key Laboratory for Genetics of Birth Defects, Beijing Pediatric Research Institute; MOE Key Laboratory of Major Diseases in Children; Genetics and Birth Defects Control Center, Beijing Children’s HospitalCapital Medical University, National Center for Children’s HealthBeijingChina
- Henan Key Laboratory of Pediatric Inherited & Metabolic DiseasesHenan Children’s HospitalZhengzhou Hospital of Beijing Children’s HospitalZhengzhouChina
| | - Ruolan Guo
- Beijing Key Laboratory for Genetics of Birth Defects, Beijing Pediatric Research Institute; MOE Key Laboratory of Major Diseases in Children; Genetics and Birth Defects Control Center, Beijing Children’s HospitalCapital Medical University, National Center for Children’s HealthBeijingChina
- Henan Key Laboratory of Pediatric Inherited & Metabolic DiseasesHenan Children’s HospitalZhengzhou Hospital of Beijing Children’s HospitalZhengzhouChina
| | - Xuyun Hu
- Beijing Key Laboratory for Genetics of Birth Defects, Beijing Pediatric Research Institute; MOE Key Laboratory of Major Diseases in Children; Genetics and Birth Defects Control Center, Beijing Children’s HospitalCapital Medical University, National Center for Children’s HealthBeijingChina
- Henan Key Laboratory of Pediatric Inherited & Metabolic DiseasesHenan Children’s HospitalZhengzhou Hospital of Beijing Children’s HospitalZhengzhouChina
| | - Yuanying Chen
- Beijing Key Laboratory for Genetics of Birth Defects, Beijing Pediatric Research Institute; MOE Key Laboratory of Major Diseases in Children; Genetics and Birth Defects Control Center, Beijing Children’s HospitalCapital Medical University, National Center for Children’s HealthBeijingChina
- Henan Key Laboratory of Pediatric Inherited & Metabolic DiseasesHenan Children’s HospitalZhengzhou Hospital of Beijing Children’s HospitalZhengzhouChina
| | - Weili Yang
- Henan Key Laboratory of Pediatric Inherited & Metabolic DiseasesHenan Children’s HospitalZhengzhou Hospital of Beijing Children’s HospitalZhengzhouChina
| | - Wei Li
- Beijing Key Laboratory for Genetics of Birth Defects, Beijing Pediatric Research Institute; MOE Key Laboratory of Major Diseases in Children; Genetics and Birth Defects Control Center, Beijing Children’s HospitalCapital Medical University, National Center for Children’s HealthBeijingChina
- Henan Key Laboratory of Pediatric Inherited & Metabolic DiseasesHenan Children’s HospitalZhengzhou Hospital of Beijing Children’s HospitalZhengzhouChina
| | - Yingjun Feng
- Department of CardiologyChildren’s Hospital Affiliated to Zhengzhou University, Henan Children’s Hospital, Zhengzhou Children’s HospitalZhengzhouChina
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18
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Gaertner A, Klauke B, Brodehl A, Milting H. RBM20 mutations in left ventricular non-compaction cardiomyopathy. Pediatr Investig 2020; 4:61-63. [PMID: 32851345 PMCID: PMC7331358 DOI: 10.1002/ped4.12184] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Affiliation(s)
- Anna Gaertner
- Heart and Diabetes Center NRWUniversity Hospital of the Ruhr‐University Bochum, Clinic of Thoracic and Cardiovascular Surgery, Erich and Hanna Klessmann Institute for Cardiovascular Research and DevelopmentGeorgstrasse 11D‐32545Bad OeynhausenGermany
| | - Bärbel Klauke
- Heart and Diabetes Center NRWUniversity Hospital of the Ruhr‐University Bochum, Clinic of Thoracic and Cardiovascular Surgery, Erich and Hanna Klessmann Institute for Cardiovascular Research and DevelopmentGeorgstrasse 11D‐32545Bad OeynhausenGermany
| | - Andreas Brodehl
- Heart and Diabetes Center NRWUniversity Hospital of the Ruhr‐University Bochum, Clinic of Thoracic and Cardiovascular Surgery, Erich and Hanna Klessmann Institute for Cardiovascular Research and DevelopmentGeorgstrasse 11D‐32545Bad OeynhausenGermany
| | - Hendrik Milting
- Heart and Diabetes Center NRWUniversity Hospital of the Ruhr‐University Bochum, Clinic of Thoracic and Cardiovascular Surgery, Erich and Hanna Klessmann Institute for Cardiovascular Research and DevelopmentGeorgstrasse 11D‐32545Bad OeynhausenGermany
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Hey TM, Rasmussen TB, Madsen T, Aagaard MM, Harbo M, Mølgaard H, Møller JE, Eiskjær H, Mogensen J. Pathogenic RBM20-Variants Are Associated With a Severe Disease Expression in Male Patients With Dilated Cardiomyopathy. Circ Heart Fail 2020; 12:e005700. [PMID: 30871348 DOI: 10.1161/circheartfailure.118.005700] [Citation(s) in RCA: 51] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Background As pathogenic variants in the gene for RBM20 appear with a frequency of 6% among Danish patients with dilated cardiomyopathy (DCM), it was the aim to investigate the associated disease expression in affected families. Methods and Results Clinical investigations were routinely performed in DCM index-patients and their relatives. In addition, ≥76 recognized and likely DCM-genes were investigated. DNA-sequence-variants within RBM20 were considered suitable for genetic testing when they fulfilled the criteria of (1) being pathogenic according to the American College of Medical Genetics and Genomics-classification, (2) appeared with an allele frequency of <1:10.000, and (3) segregated with DCM in ≥7 affected individuals. A total of 80 individuals from 15 families carried 5 different pathogenic RBM20-variants considered suitable for genetic testing. The penetrance was 66% (53/80) and age-dependent. Males were both significantly younger and had lower ejection fraction at diagnosis than females (age, 29±11 versus 48±12 years; P<0.01; ejection fraction, 29±13% versus 38±9%; P<0.01). Furthermore, 11 of 31 affected males needed a cardiac transplant while none of 22 affected females required this treatment ( P<0.001). Thirty percent of RBM20-carriers with DCM died suddenly or experienced severe ventricular arrhythmias although no adverse events were identified among healthy RBM20-carriers with a normal cardiac investigation. The event-free survival of male RBM20-carriers was significantly shorter compared with female carriers ( P<0.001). Conclusions The disease expression associated with pathogenic RBM20-variants was severe especially in males. The findings of the current study suggested that close clinical follow-up of RBM20-carriers is important which may ensure early detection of disease development and thereby improve management.
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Affiliation(s)
- Thomas Morris Hey
- Department of Cardiology, Odense University Hospital, Denmark (T.M.H., J.E.M., J.M.)
- Faculty of Health Sciences, University of Southern Denmark, Odense (T.M.H., J.E.M., J.M.)
- Odense Patient Data Explorative Network (OPEN), University of Southern Denmark, Odense (T.M.H., J.E.M., J.M.)
| | - Torsten B Rasmussen
- Department of Cardiology, Aarhus University Hospital, Denmark (T.B.R., H.M., H.E.)
| | - Trine Madsen
- Department of Cardiology, Aalborg University Hospital, Denmark (T.M.)
| | - Mads Malik Aagaard
- Department of Clinical Genetics, Hospital Lillebaelt, Vejle, Denmark (M.M.A., M.H.)
| | - Maria Harbo
- Department of Clinical Genetics, Hospital Lillebaelt, Vejle, Denmark (M.M.A., M.H.)
| | - Henning Mølgaard
- Department of Cardiology, Aarhus University Hospital, Denmark (T.B.R., H.M., H.E.)
| | - Jacob E Møller
- Department of Cardiology, Odense University Hospital, Denmark (T.M.H., J.E.M., J.M.)
- Faculty of Health Sciences, University of Southern Denmark, Odense (T.M.H., J.E.M., J.M.)
- Odense Patient Data Explorative Network (OPEN), University of Southern Denmark, Odense (T.M.H., J.E.M., J.M.)
| | - Hans Eiskjær
- Department of Cardiology, Aarhus University Hospital, Denmark (T.B.R., H.M., H.E.)
| | - Jens Mogensen
- Department of Cardiology, Odense University Hospital, Denmark (T.M.H., J.E.M., J.M.)
- Faculty of Health Sciences, University of Southern Denmark, Odense (T.M.H., J.E.M., J.M.)
- Odense Patient Data Explorative Network (OPEN), University of Southern Denmark, Odense (T.M.H., J.E.M., J.M.)
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20
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Jaouadi H, Bouyacoub Y, Chabrak S, Kraoua L, Zaroui A, Elouej S, Nagara M, Dallali H, Delague V, Levy N, Benkhalifa R, Mechmeche R, Zaffran S, Abdelhak S. Multiallelic rare variants support an oligogenic origin of sudden cardiac death in the young. Herz 2020; 46:94-102. [PMID: 31970460 DOI: 10.1007/s00059-019-04883-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Revised: 09/20/2019] [Accepted: 12/06/2019] [Indexed: 12/16/2022]
Abstract
Unexplained sudden death in the young is cardiovascular in most cases. Structural and conduction defects in cardiac-related genes can conspire to underlie sudden cardiac death. Here we report a clinical investigation and an extensive genetic assessment of a Tunisian family with sudden cardiac death in young members. In order to identify the family-genetic basis of sudden cardiac death, we performed Whole Exome Sequencing (WES), read depth copy-number-variation (CNV) screening and segregation analysis. We identify 6 ultra-rare pathogenic heterozygous variants in OBSCN, RYR2, DSC2, AKAP9, CACNA1C and RBM20 genes, and one homozygous splicing variant in TECRL gene consistent with an oligogenic model of inheritance. CNV analysis did not reveal any causative CNV consistent with the family phenotype. Overall, our results are highly suggestive for a cumulative effect of heterozygous missense variants as disease causation and to account for a greater disease severity among offspring. Our study further confirms the complexity of the inheritance of sudden cardiac death and highlights the utility of family-based WES and segregation analysis in the identification of family specific mutations within different cardiac genes pathways.
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Affiliation(s)
- Hager Jaouadi
- Biomedical Genomics and Oncogenetics Laboratory LR16IPT05, Institut Pasteur de Tunis, Université Tunis El Manar, 13 Place Pasteur, BP74-1002, Tunis, belvédère, Tunisia.
| | - Yosra Bouyacoub
- Biomedical Genomics and Oncogenetics Laboratory LR16IPT05, Institut Pasteur de Tunis, Université Tunis El Manar, 13 Place Pasteur, BP74-1002, Tunis, belvédère, Tunisia
| | - Sonia Chabrak
- Department of Cardiology, La Rabta Hospital, Tunis, Tunisia.,Faculty of Medicine of Tunis, Université Tunis El Manar, Tunis, Tunisia
| | - Lilia Kraoua
- Department of Congenital and Hereditary Diseases, Charles Nicolle Hospital, Tunis, Tunisia
| | - Amira Zaroui
- Faculty of Medicine of Tunis, Université Tunis El Manar, Tunis, Tunisia
| | - Sahar Elouej
- Aix Marseille University, INSERM, U1251, Marseille Medical Genetics, Marseille, France
| | - Majdi Nagara
- Biomedical Genomics and Oncogenetics Laboratory LR16IPT05, Institut Pasteur de Tunis, Université Tunis El Manar, 13 Place Pasteur, BP74-1002, Tunis, belvédère, Tunisia
| | - Hamza Dallali
- Biomedical Genomics and Oncogenetics Laboratory LR16IPT05, Institut Pasteur de Tunis, Université Tunis El Manar, 13 Place Pasteur, BP74-1002, Tunis, belvédère, Tunisia
| | - Valérie Delague
- Aix Marseille University, INSERM, U1251, Marseille Medical Genetics, Marseille, France
| | - Nicolas Levy
- Aix Marseille University, INSERM, U1251, Marseille Medical Genetics, Marseille, France
| | - Rym Benkhalifa
- Venoms and Therapeutic Biomolecules Laboratory LR16IPT08, Institut Pasteur de Tunis, Tunis, Tunisia
| | - Rachid Mechmeche
- Department of Cardiology, La Rabta Hospital, Tunis, Tunisia.,Faculty of Medicine of Tunis, Université Tunis El Manar, Tunis, Tunisia
| | - Stéphane Zaffran
- Aix Marseille University, INSERM, U1251, Marseille Medical Genetics, Marseille, France
| | - Sonia Abdelhak
- Biomedical Genomics and Oncogenetics Laboratory LR16IPT05, Institut Pasteur de Tunis, Université Tunis El Manar, 13 Place Pasteur, BP74-1002, Tunis, belvédère, Tunisia
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21
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Genetic variations in olfactory receptor gene OR2AG2 in a large multigenerational family with asthma. Sci Rep 2019; 9:19029. [PMID: 31836740 PMCID: PMC6911056 DOI: 10.1038/s41598-019-54718-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2019] [Accepted: 11/13/2019] [Indexed: 01/23/2023] Open
Abstract
It is estimated from twin studies that heritable factors account for at-least half of asthma-risk, of which genetic variants identified through population studies explain only a small fraction. Multi-generation large families with high asthma prevalence can serve as a model to identify highly penetrant genetic variants in closely related individuals that are missed by population studies. To achieve this, a four-generation Indian family with asthma was identified and recruited for examination and genetic testing. Twenty subjects representing all generations were selected for whole genome genotyping, of which eight were subjected to exome sequencing. Non-synonymous and deleterious variants, segregating with the affected individuals, were identified by exome sequencing. A prioritized deleterious missense common variant in the olfactory receptor gene OR2AG2 that segregated with a risk haplotype in asthma, was validated in an asthma cohort of different ethnicity. Phenotypic tests were conducted to verify expected deficits in terms of reduced ability to sense odors. Pathway-level relevance to asthma biology was tested in model systems and unrelated human lung samples. Our study suggests that OR2AG2 and other olfactory receptors may contribute to asthma pathophysiology. Genetic studies on large families of interest can lead to efficient discovery.
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22
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Gaertner A, Brodehl A, Milting H. Screening for mutations in human cardiomyopathy- is RBM24 a new but rare disease gene? Protein Cell 2019; 10:393-394. [PMID: 30421357 PMCID: PMC6538575 DOI: 10.1007/s13238-018-0590-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Affiliation(s)
- Anna Gaertner
- Erich and Hanna Klessmann Institute, Heart and Diabetes Center NRW, University Hospital of the Ruhr-University Bochum, Georgstrasse 11, 32545, Bad Oeynhausen, Germany.
| | - Andreas Brodehl
- Erich and Hanna Klessmann Institute, Heart and Diabetes Center NRW, University Hospital of the Ruhr-University Bochum, Georgstrasse 11, 32545, Bad Oeynhausen, Germany
| | - Hendrik Milting
- Erich and Hanna Klessmann Institute, Heart and Diabetes Center NRW, University Hospital of the Ruhr-University Bochum, Georgstrasse 11, 32545, Bad Oeynhausen, Germany.
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23
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Yamamoto T, Miura A, Itoh K, Takeshima Y, Nishio H. RNA sequencing reveals abnormal LDB3 splicing in sudden cardiac death. Forensic Sci Int 2019; 302:109906. [DOI: 10.1016/j.forsciint.2019.109906] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Accepted: 07/21/2019] [Indexed: 02/07/2023]
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24
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Pantou MP, Gourzi P, Gkouziouta A, Tsiapras D, Zygouri C, Constantoulakis P, Adamopoulos S, Degiannis D. Phenotypic Heterogeneity within Members of a Family Carrying the Same RBM20 Mutation R634W. Cardiology 2018; 141:150-155. [PMID: 30557877 DOI: 10.1159/000494453] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Accepted: 10/11/2018] [Indexed: 11/19/2022]
Abstract
OBJECTIVE We present the genotypic and phenotypic characterization of a family displaying dilated cardiomyopathy (DCM). METHODS The proband and his relatives underwent full cardiological assessment. Genetic analysis of the proband was performed with the use of next-generation sequencing technology. RESULTS In this study, we present 6 members of a family carrying the RBM20 mutation NM_001134363.2:c.1900C>T. The proband was initially diagnosed with DCM at the age of 18 years and received an implantable cardioverter defibrillator (ICD) due to ventricular arrhythmias. His brother, carrier of the mutation, has been diagnosed with borderline left ventricular function. The mutation was shown to be of paternal origin, but their father remains asymptomatic with a mild DCM, while his electrocardiogram at the initial evaluation showed a right bundle branch block pattern. The mutation was also detected in the index case's aunt who was resuscitated from sudden cardiac death. Her echocardiography revealed early stages of DCM and a bicuspid aortic valve. Her children are both carriers of the mutation. Her daughter is unaffected, but her son has an ICD implanted due to sustained ventricular tachycardia and presents early signs of DCM. CONCLUSION Our findings are the first report of co-segregation of the mutation in 6 family members, supporting its pathogenic role.
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Affiliation(s)
- Malena P Pantou
- Molecular Immunopathology and Histocompatibility Unit, Division of Molecular Genetics, Onassis Cardiac Surgery Center, Athens, Greece
| | - Polyxeni Gourzi
- Molecular Immunopathology and Histocompatibility Unit, Division of Molecular Genetics, Onassis Cardiac Surgery Center, Athens, Greece,
| | - Aggeliki Gkouziouta
- Heart Failure, MCS and Transplant Unit, Onassis Cardiac Surgery Center, Athens, Greece
| | | | - Christianna Zygouri
- Department of Molecular Genetics, BioAnalytica-Genotypes S.A., Athens, Greece
| | | | - Stamatis Adamopoulos
- Heart Failure, MCS and Transplant Unit, Onassis Cardiac Surgery Center, Athens, Greece
| | - Dimitrios Degiannis
- Molecular Immunopathology and Histocompatibility Unit, Division of Molecular Genetics, Onassis Cardiac Surgery Center, Athens, Greece
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25
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Watanabe T, Kimura A, Kuroyanagi H. Alternative Splicing Regulator RBM20 and Cardiomyopathy. Front Mol Biosci 2018; 5:105. [PMID: 30547036 PMCID: PMC6279932 DOI: 10.3389/fmolb.2018.00105] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Accepted: 11/09/2018] [Indexed: 12/17/2022] Open
Abstract
RBM20 is a vertebrate-specific RNA-binding protein with two zinc finger (ZnF) domains, one RNA-recognition motif (RRM)-type RNA-binding domain and an arginine/serine (RS)-rich region. RBM20 has initially been identified as one of dilated cardiomyopathy (DCM)-linked genes. RBM20 is a regulator of heart-specific alternative splicing and Rbm20ΔRRM mice lacking the RRM domain are defective in the splicing regulation. The Rbm20ΔRRM mice, however, do not exhibit a characteristic DCM-like phenotype such as dilatation of left ventricles or systolic dysfunction. Considering that most of the RBM20 mutations identified in familial DCM cases were heterozygous missense mutations in an arginine-serine-arginine-serine-proline (RSRSP) stretch whose phosphorylation is crucial for nuclear localization of RBM20, characterization of a knock-in animal model is awaited. One of the major targets for RBM20 is the TTN gene, which is comprised of the largest number of exons in mammals. Alternative splicing of the TTN gene is exceptionally complicated and RBM20 represses >160 of its consecutive exons, yet detailed mechanisms for such extraordinary regulation are to be elucidated. The TTN gene encodes the largest known protein titin, a multi-functional sarcomeric structural protein specific to striated muscles. As titin is the most important factor for passive tension of cardiomyocytes, extensive heart-specific and developmentally regulated alternative splicing of the TTN pre-mRNA by RBM20 plays a critical role in passive stiffness and diastolic function of the heart. In disease models with diastolic dysfunctions, the phenotypes were rescued by increasing titin compliance through manipulation of the Ttn pre-mRNA splicing, raising RBM20 as a potential therapeutic target.
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Affiliation(s)
- Takeshi Watanabe
- Laboratory of Gene Expression, Medical Research Institute, Tokyo Medical and Dental University (TMDU), Tokyo, Japan.,Department of Psychosomatic Dentistry, Graduate School of Medical and Dental Science, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - Akinori Kimura
- Division of Pathology, Department of Molecular Pathogenesis, Medical Research Institute, Tokyo Medical and Dental University (TMDU), Tokyo, Japan.,Laboratory for Integrated Research Projects on Intractable Diseases Advanced Technology Laboratories, Medical Research Institute, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - Hidehito Kuroyanagi
- Laboratory of Gene Expression, Medical Research Institute, Tokyo Medical and Dental University (TMDU), Tokyo, Japan.,Laboratory for Integrated Research Projects on Intractable Diseases Advanced Technology Laboratories, Medical Research Institute, Tokyo Medical and Dental University (TMDU), Tokyo, Japan.,Department of Microbiology, Immunology and Molecular Genetics, University of California, Los Angeles, Los Angeles, CA, United States
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26
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PRMT1 Deficiency in Mouse Juvenile Heart Induces Dilated Cardiomyopathy and Reveals Cryptic Alternative Splicing Products. iScience 2018; 8:200-213. [PMID: 30321814 PMCID: PMC6197527 DOI: 10.1016/j.isci.2018.09.023] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Revised: 09/25/2018] [Accepted: 09/26/2018] [Indexed: 12/11/2022] Open
Abstract
Protein arginine methyltransferase 1 (PRMT1) catalyzes the asymmetric dimethylation of arginine residues in proteins and methylation of various RNA-binding proteins and is associated with alternative splicing in vitro. Although PRMT1 has essential in vivo roles in embryonic development, CNS development, and skeletal muscle regeneration, the functional importance of PRMT1 in the heart remains to be elucidated. Here, we report that juvenile cardiomyocyte-specific PRMT1-deficient mice develop severe dilated cardiomyopathy and exhibit aberrant cardiac alternative splicing. Furthermore, we identified previously undefined cardiac alternative splicing isoforms of four genes (Asb2, Fbxo40, Nrap, and Eif4a2) in PRMT1-cKO mice and revealed that eIF4A2 protein isoforms translated from alternatively spliced mRNA were differentially ubiquitinated and degraded by the ubiquitin-proteasome system. These findings highlight the essential roles of PRMT1 in cardiac homeostasis and alternative splicing regulation. PRMT1 deficiency in cardiomyocytes causes dilated cardiomyopathy in juvenile mice PRMT1-deficient heart shows abnormal alternative splicing patterns Previously undefined cardiac splicing events are revealed by transcriptome analysis eIF4A2 isoforms are differentially ubiquitinated and degraded
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27
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RNA binding protein 24 deletion disrupts global alternative splicing and causes dilated cardiomyopathy. Protein Cell 2018; 10:405-416. [PMID: 30267374 PMCID: PMC6538757 DOI: 10.1007/s13238-018-0578-8] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Accepted: 08/24/2018] [Indexed: 01/08/2023] Open
Abstract
RNA splicing contributes to a broad spectrum of post-transcriptional gene regulation during normal development, as well as pathological manifestation of heart diseases. However, the functional role and regulation of splicing in heart failure remain poorly understood. RNA binding protein (RBP), a major component of the splicing machinery, is a critical factor in this process. RNA binding motif protein 24 (RBM24) is a tissue-specific RBP which is highly expressed in human and mouse heart. Previous studies demonstrated the functional role of RBM24 in the embryonic heart development. However, the role of RBM24 in postnatal heart development and heart disease has not been investigated. In this paper, using conditional RBM24 knockout mice, we demonstrated that ablation of RBM24 in postnatal heart led to rapidly progressive dilated cardiomyopathy (DCM), heart failure, and postnatal lethality. Global splicing profiling revealed that RBM24 regulated a network of genes related to cardiac function and diseases. Knockout of RBM24 resulted in misregulation of these splicing transitions which contributed to the subsequent development of cardiomyopathy. Notably, our analysis identified RBM24 as a splice factor that determined the splicing switch of a subset of genes in the sacomeric Z-disc complex, including Titin, the major disease gene of DCM and heart failure. Together, this study identifies regulation of RNA splicing by RBM24 as a potent player in remodeling of heart during postnatal development, and provides novel mechanistic insights to the pathogenesis of DCM.
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28
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Zahr HC, Jaalouk DE. Exploring the Crosstalk Between LMNA and Splicing Machinery Gene Mutations in Dilated Cardiomyopathy. Front Genet 2018; 9:231. [PMID: 30050558 PMCID: PMC6052891 DOI: 10.3389/fgene.2018.00231] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2018] [Accepted: 06/11/2018] [Indexed: 12/18/2022] Open
Abstract
Mutations in the LMNA gene, which encodes for the nuclear lamina proteins lamins A and C, are responsible for a diverse group of diseases known as laminopathies. One type of laminopathy is Dilated Cardiomyopathy (DCM), a heart muscle disease characterized by dilation of the left ventricle and impaired systolic function, often leading to heart failure and sudden cardiac death. LMNA is the second most commonly mutated gene in DCM. In addition to LMNA, mutations in more than 60 genes have been associated with DCM. The DCM-associated genes encode a variety of proteins including transcription factors, cytoskeletal, Ca2+-regulating, ion-channel, desmosomal, sarcomeric, and nuclear-membrane proteins. Another important category among DCM-causing genes emerged upon the identification of DCM-causing mutations in RNA binding motif protein 20 (RBM20), an alternative splicing factor that is chiefly expressed in the heart. In addition to RBM20, several essential splicing factors were validated, by employing mouse knock out models, to be embryonically lethal due to aberrant cardiogenesis. Furthermore, heart-specific deletion of some of these splicing factors was found to result in aberrant splicing of their targets and DCM development. In addition to splicing alterations, advances in next generation sequencing highlighted the association between splice-site mutations in several genes and DCM. This review summarizes LMNA mutations and splicing alterations in DCM and discusses how the interaction between LMNA and splicing regulators could possibly explain DCM disease mechanisms.
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Affiliation(s)
| | - Diana E. Jaalouk
- Department of Biology, Faculty of Arts and Sciences, American University of Beirut, Beirut, Lebanon
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29
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Guo W, Zhu C, Yin Z, Wang Q, Sun M, Cao H, Greaser ML. Splicing Factor RBM20 Regulates Transcriptional Network of Titin Associated and Calcium Handling Genes in The Heart. Int J Biol Sci 2018; 14:369-380. [PMID: 29725258 PMCID: PMC5930469 DOI: 10.7150/ijbs.24117] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Accepted: 02/27/2018] [Indexed: 01/28/2023] Open
Abstract
RNA binding motif 20 (RBM20) regulates pre-mRNA splicing of over thirty genes, among which titin is a major target. With RBM20 expression, titin expresses a larger isoform at fetal stage to a smaller isoform at adult resulting from alternative splicing, while, without RBM20, titin expresses exclusively a larger isoform throughout all ages. In addition to splicing regulation, it is unknown whether RBM20 also regulates gene expression. In this study, we employed Rbm20 knockout rats to investigate gene expression profile using Affymetrix expression array. We compared wild type to Rbm20 knockout at day1, 20 and 49. Bioinformatics analysis showed RBM20 regulates fewer genes expression at younger age and more at older age and commonly expressed genes have the same trends. GSEA indicated up-regulated genes are associated with heart failure. We examined titin binding partners. All titin direct binding partners are up-regulated and their increased expression is associated with dilated cardiomyopathy. Particularly, we found that genes involving calcium handling and muscle contraction are changed by RBM20. Intracellular calcium level measurement with individual cardiomyocytes further confirmed that changes of these proteins impact calcium handling. Selected genes from titin binding partners and calcium handling were validated with QPCR and western blotting. These data demonstrate that RBM20 regulates gene splicing as well as gene expression. Altered gene expression by RBM20 influences protein-protein interaction, calcium releasing and thus muscle contraction. Our results first reported gene expression impacted by RBM20 with heart maturation, and provided new insights into the role of RBM20 in the progression of heart failure.
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Affiliation(s)
- Wei Guo
- Animal Science, University of Wyoming, Laramie, WY 82071, USA.,Center for Cardiovascular Research and Alternative Medicine, University of Wyoming, Laramie, WY 82071, USA
| | - Chaoqun Zhu
- Animal Science, University of Wyoming, Laramie, WY 82071, USA.,Center for Cardiovascular Research and Alternative Medicine, University of Wyoming, Laramie, WY 82071, USA
| | - Zhiyong Yin
- Animal Science, University of Wyoming, Laramie, WY 82071, USA.,Department of Cardiology, Xi Jing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Qiurong Wang
- Animal Science, University of Wyoming, Laramie, WY 82071, USA.,Center for Cardiovascular Research and Alternative Medicine, University of Wyoming, Laramie, WY 82071, USA
| | - Mingming Sun
- Animal Science, University of Wyoming, Laramie, WY 82071, USA.,Center for Cardiovascular Research and Alternative Medicine, University of Wyoming, Laramie, WY 82071, USA
| | - Huojun Cao
- Iowa Institute for Oral Health Research, College of Dentistry.,Craniofacial Anomalies Research Center, Carver College of Medicine, The University of Iowa, Iowa City, IA 52242, USA
| | - Marion L Greaser
- Animal Science, University of Wisconsin-Madison, Madison, WI 53705, USA
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30
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Streckfuss-Bömeke K, Tiburcy M, Fomin A, Luo X, Li W, Fischer C, Özcelik C, Perrot A, Sossalla S, Haas J, Vidal RO, Rebs S, Khadjeh S, Meder B, Bonn S, Linke WA, Zimmermann WH, Hasenfuss G, Guan K. Severe DCM phenotype of patient harboring RBM20 mutation S635A can be modeled by patient-specific induced pluripotent stem cell-derived cardiomyocytes. J Mol Cell Cardiol 2017; 113:9-21. [PMID: 28941705 DOI: 10.1016/j.yjmcc.2017.09.008] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/09/2017] [Revised: 09/01/2017] [Accepted: 09/19/2017] [Indexed: 10/18/2022]
Abstract
The ability to generate patient-specific induced pluripotent stem cells (iPSCs) provides a unique opportunity for modeling heart disease in vitro. In this study, we generated iPSCs from a patient with dilated cardiomyopathy (DCM) caused by a missense mutation S635A in RNA-binding motif protein 20 (RBM20) and investigated the functionality and cell biology of cardiomyocytes (CMs) derived from patient-specific iPSCs (RBM20-iPSCs). The RBM20-iPSC-CMs showed abnormal distribution of sarcomeric α-actinin and defective calcium handling compared to control-iPSC-CMs, suggesting disorganized myofilament structure and altered calcium machinery in CMs of the RBM20 patient. Engineered heart muscles (EHMs) from RBM20-iPSC-CMs showed that not only active force generation was impaired in RBM20-EHMs but also passive stress of the tissue was decreased, suggesting a higher visco-elasticity of RBM20-EHMs. Furthermore, we observed a reduced titin (TTN) N2B-isoform expression in RBM20-iPSC-CMs by demonstrating a reduction of exon skipping in the PEVK region of TTN and an inhibition of TTN isoform switch. In contrast, in control-iPSC-CMs both TTN isoforms N2B and N2BA were expressed, indicating that the TTN isoform switch occurs already during early cardiogenesis. Using next generation RNA sequencing, we mapped transcriptome and splicing target profiles of RBM20-iPSC-CMs and identified different cardiac gene networks in response to the analyzed RBM20 mutation in cardiac-specific processes. These findings shed the first light on molecular mechanisms of RBM20-dependent pathological cardiac remodeling leading to DCM. Our data demonstrate that iPSC-CMs coupled with EHMs provide a powerful tool for evaluating disease-relevant functional defects and for a deeper mechanistic understanding of alternative splicing-related cardiac diseases.
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Affiliation(s)
- Katrin Streckfuss-Bömeke
- Department of Cardiology and Pneumology, Universitätsmedizin Göttingen, Germany; DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Germany
| | - Malte Tiburcy
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Germany; Institute of Pharmacology and Toxicology, Universitätsmedizin Göttingen, Germany
| | - Andrey Fomin
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Germany; Department of Cardiovascular Physiology, Ruhr University Bochum, Germany
| | - Xiaojing Luo
- Institute of Pharmacology and Toxicology, Technische Universität Dresden, Germany
| | - Wener Li
- Institute of Pharmacology and Toxicology, Technische Universität Dresden, Germany
| | - Claudia Fischer
- Department of Cardiology and Pneumology, Universitätsmedizin Göttingen, Germany; DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Germany
| | - Cemil Özcelik
- Cardiovascular Genetics, Experimental and Clinical Research Center, Charité-Universitätsmedizin Berlin, Germany; Medizinischen Klinik I Kardiologie, Gastroenterologie und Diabetologie, Knappschaftskrankenhaus Recklingshausen, Germany
| | - Andreas Perrot
- Cardiovascular Genetics, Experimental and Clinical Research Center, Charité-Universitätsmedizin Berlin, Germany
| | - Samuel Sossalla
- Department of Cardiology and Pneumology, Universitätsmedizin Göttingen, Germany; DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Germany; Department of Internal Medicine 2 - Cardiology, University Medical Center Regensburg, Germany
| | - Jan Haas
- Department of Cardiology, University of Heidelberg, Germany; DZHK, Partner Site Heidelberg, Germany
| | | | - Sabine Rebs
- Department of Cardiology and Pneumology, Universitätsmedizin Göttingen, Germany
| | - Sara Khadjeh
- Department of Cardiology and Pneumology, Universitätsmedizin Göttingen, Germany; DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Germany
| | - Benjamin Meder
- Department of Cardiology, University of Heidelberg, Germany; DZHK, Partner Site Heidelberg, Germany
| | - Stefan Bonn
- German Center for Neurodegenerative Diseases, Göttingen and Tübingen, Germany; Institute of Medical Systems Biology, Center for Molecular Neurobiology, University Clinic Hamburg-Eppendorf, Hamburg, Germany
| | - Wolfgang A Linke
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Germany; Department of Cardiovascular Physiology, Ruhr University Bochum, Germany
| | - Wolfram-Hubertus Zimmermann
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Germany; Institute of Pharmacology and Toxicology, Universitätsmedizin Göttingen, Germany
| | - Gerd Hasenfuss
- Department of Cardiology and Pneumology, Universitätsmedizin Göttingen, Germany; DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Germany
| | - Kaomei Guan
- Department of Cardiology and Pneumology, Universitätsmedizin Göttingen, Germany; Institute of Pharmacology and Toxicology, Technische Universität Dresden, Germany.
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Burke MA, Cook SA, Seidman JG, Seidman CE. Clinical and Mechanistic Insights Into the Genetics of Cardiomyopathy. J Am Coll Cardiol 2017; 68:2871-2886. [PMID: 28007147 DOI: 10.1016/j.jacc.2016.08.079] [Citation(s) in RCA: 204] [Impact Index Per Article: 29.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2016] [Revised: 08/01/2016] [Accepted: 08/02/2016] [Indexed: 12/19/2022]
Abstract
Over the last quarter-century, there has been tremendous progress in genetics research that has defined molecular causes for cardiomyopathies. More than a thousand mutations have been identified in many genes with varying ontologies, therein indicating the diverse molecules and pathways that cause hypertrophic, dilated, restrictive, and arrhythmogenic cardiomyopathies. Translation of this research to the clinic via genetic testing can precisely group affected patients according to molecular etiology, and identify individuals without evidence of disease who are at high risk for developing cardiomyopathy. These advances provide insights into the earliest manifestations of cardiomyopathy and help to define the molecular pathophysiological basis for cardiac remodeling. Although these efforts remain incomplete, new genomic technologies and analytic strategies provide unparalleled opportunities to fully explore the genetic architecture of cardiomyopathies. Such data hold the promise that mutation-specific pathophysiology will uncover novel therapeutic targets, and herald the beginning of precision therapy for cardiomyopathy patients.
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Affiliation(s)
- Michael A Burke
- Division of Cardiology, Emory University School of Medicine, Atlanta, Georgia; Department of Genetics, Harvard Medical School, Boston, Massachusetts
| | - Stuart A Cook
- National Heart & Lung Institute, Imperial College London, London, United Kingdom; National Heart Centre Singapore, Singapore; Duke-National University of Singapore, Singapore
| | | | - Christine E Seidman
- Department of Genetics, Harvard Medical School, Boston, Massachusetts; Division of Cardiovascular Medicine, Brigham and Women's Hospital, Boston, Massachusetts; Howard Hughes Medical Institute, Chevy Chase, Maryland.
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32
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Alternative splicing as a regulator of development and tissue identity. Nat Rev Mol Cell Biol 2017; 18:437-451. [PMID: 28488700 DOI: 10.1038/nrm.2017.27] [Citation(s) in RCA: 788] [Impact Index Per Article: 112.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Alternative splicing of eukaryotic transcripts is a mechanism that enables cells to generate vast protein diversity from a limited number of genes. The mechanisms and outcomes of alternative splicing of individual transcripts are relatively well understood, and recent efforts have been directed towards studying splicing networks. It has become apparent that coordinated splicing networks regulate tissue and organ development, and that alternative splicing has important physiological functions in different developmental processes in humans.
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33
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D'Souza M, Sulakhe D, Wang S, Xie B, Hashemifar S, Taylor A, Dubchak I, Conrad Gilliam T, Maltsev N. Strategic Integration of Multiple Bioinformatics Resources for System Level Analysis of Biological Networks. Methods Mol Biol 2017; 1613:85-99. [PMID: 28849559 DOI: 10.1007/978-1-4939-7027-8_5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Recent technological advances in genomics allow the production of biological data at unprecedented tera- and petabyte scales. Efficient mining of these vast and complex datasets for the needs of biomedical research critically depends on a seamless integration of the clinical, genomic, and experimental information with prior knowledge about genotype-phenotype relationships. Such experimental data accumulated in publicly available databases should be accessible to a variety of algorithms and analytical pipelines that drive computational analysis and data mining.We present an integrated computational platform Lynx (Sulakhe et al., Nucleic Acids Res 44:D882-D887, 2016) ( http://lynx.cri.uchicago.edu ), a web-based database and knowledge extraction engine. It provides advanced search capabilities and a variety of algorithms for enrichment analysis and network-based gene prioritization. It gives public access to the Lynx integrated knowledge base (LynxKB) and its analytical tools via user-friendly web services and interfaces. The Lynx service-oriented architecture supports annotation and analysis of high-throughput experimental data. Lynx tools assist the user in extracting meaningful knowledge from LynxKB and experimental data, and in the generation of weighted hypotheses regarding the genes and molecular mechanisms contributing to human phenotypes or conditions of interest. The goal of this integrated platform is to support the end-to-end analytical needs of various translational projects.
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Affiliation(s)
- Mark D'Souza
- Department of Human Genetics, University of Chicago, 920 E. 58th Street, Chicago, IL, 60637, USA.
- Argonne National Laboratory, Building 221, Room: A142, 9700 South Cass Avenue, Argonne, IL, 60439, USA.
| | - Dinanath Sulakhe
- Department of Human Genetics, University of Chicago, 920 E. 58th Street, Chicago, IL, 60637, USA
- Computation Institute, University of Chicago, 5735 S. Ellis Avenue, Chicago, IL, 60637, USA
| | - Sheng Wang
- Department of Human Genetics, University of Chicago, 920 E. 58th Street, Chicago, IL, 60637, USA
- Toyota Technological Institute at Chicago, 6045 S. Kenwood Avenue, Chicago, IL, 60637, USA
| | - Bing Xie
- Department of Human Genetics, University of Chicago, 920 E. 58th Street, Chicago, IL, 60637, USA
- Department of Computer Science, Illinois Institute of Technology, Chicago, IL, 60616, USA
| | - Somaye Hashemifar
- Toyota Technological Institute at Chicago, 6045 S. Kenwood Avenue, Chicago, IL, 60637, USA
| | - Andrew Taylor
- Department of Human Genetics, University of Chicago, 920 E. 58th Street, Chicago, IL, 60637, USA
| | - Inna Dubchak
- Genomics Division, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America, Department of Energy Joint Genome Institute, Walnut Creek, CA, USA
| | - T Conrad Gilliam
- Department of Human Genetics, University of Chicago, 920 E. 58th Street, Chicago, IL, 60637, USA
- Computation Institute, University of Chicago, 5735 S. Ellis Avenue, Chicago, IL, 60637, USA
| | - Natalia Maltsev
- Department of Human Genetics, University of Chicago, 920 E. 58th Street, Chicago, IL, 60637, USA
- Computation Institute, University of Chicago, 5735 S. Ellis Avenue, Chicago, IL, 60637, USA
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34
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Kayvanpour E, Sedaghat-Hamedani F, Amr A, Lai A, Haas J, Holzer DB, Frese KS, Keller A, Jensen K, Katus HA, Meder B. Genotype-phenotype associations in dilated cardiomyopathy: meta-analysis on more than 8000 individuals. Clin Res Cardiol 2016; 106:127-139. [DOI: 10.1007/s00392-016-1033-6] [Citation(s) in RCA: 99] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Accepted: 08/23/2016] [Indexed: 02/06/2023]
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35
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Chami N, Chen MH, Slater AJ, Eicher JD, Evangelou E, Tajuddin SM, Love-Gregory L, Kacprowski T, Schick UM, Nomura A, Giri A, Lessard S, Brody JA, Schurmann C, Pankratz N, Yanek LR, Manichaikul A, Pazoki R, Mihailov E, Hill WD, Raffield LM, Burt A, Bartz TM, Becker DM, Becker LC, Boerwinkle E, Bork-Jensen J, Bottinger EP, O'Donoghue ML, Crosslin DR, de Denus S, Dubé MP, Elliott P, Engström G, Evans MK, Floyd JS, Fornage M, Gao H, Greinacher A, Gudnason V, Hansen T, Harris TB, Hayward C, Hernesniemi J, Highland HM, Hirschhorn JN, Hofman A, Irvin MR, Kähönen M, Lange E, Launer LJ, Lehtimäki T, Li J, Liewald DCM, Linneberg A, Liu Y, Lu Y, Lyytikäinen LP, Mägi R, Mathias RA, Melander O, Metspalu A, Mononen N, Nalls MA, Nickerson DA, Nikus K, O'Donnell CJ, Orho-Melander M, Pedersen O, Petersmann A, Polfus L, Psaty BM, Raitakari OT, Raitoharju E, Richard M, Rice KM, Rivadeneira F, Rotter JI, Schmidt F, Smith AV, Starr JM, Taylor KD, Teumer A, Thuesen BH, Torstenson ES, Tracy RP, Tzoulaki I, Zakai NA, Vacchi-Suzzi C, van Duijn CM, van Rooij FJA, Cushman M, Deary IJ, Velez Edwards DR, Vergnaud AC, Wallentin L, Waterworth DM, White HD, Wilson JG, Zonderman AB, Kathiresan S, Grarup N, Esko T, Loos RJF, Lange LA, Faraday N, Abumrad NA, Edwards TL, Ganesh SK, Auer PL, Johnson AD, Reiner AP, Lettre G. Exome Genotyping Identifies Pleiotropic Variants Associated with Red Blood Cell Traits. Am J Hum Genet 2016; 99:8-21. [PMID: 27346685 PMCID: PMC5005438 DOI: 10.1016/j.ajhg.2016.05.007] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Accepted: 05/03/2016] [Indexed: 11/24/2022] Open
Abstract
Red blood cell (RBC) traits are important heritable clinical biomarkers and modifiers of disease severity. To identify coding genetic variants associated with these traits, we conducted meta-analyses of seven RBC phenotypes in 130,273 multi-ethnic individuals from studies genotyped on an exome array. After conditional analyses and replication in 27,480 independent individuals, we identified 16 new RBC variants. We found low-frequency missense variants in MAP1A (rs55707100, minor allele frequency [MAF] = 3.3%, p = 2 × 10(-10) for hemoglobin [HGB]) and HNF4A (rs1800961, MAF = 2.4%, p < 3 × 10(-8) for hematocrit [HCT] and HGB). In African Americans, we identified a nonsense variant in CD36 associated with higher RBC distribution width (rs3211938, MAF = 8.7%, p = 7 × 10(-11)) and showed that it is associated with lower CD36 expression and strong allelic imbalance in ex vivo differentiated human erythroblasts. We also identified a rare missense variant in ALAS2 (rs201062903, MAF = 0.2%) associated with lower mean corpuscular volume and mean corpuscular hemoglobin (p < 8 × 10(-9)). Mendelian mutations in ALAS2 are a cause of sideroblastic anemia and erythropoietic protoporphyria. Gene-based testing highlighted three rare missense variants in PKLR, a gene mutated in Mendelian non-spherocytic hemolytic anemia, associated with HGB and HCT (SKAT p < 8 × 10(-7)). These rare, low-frequency, and common RBC variants showed pleiotropy, being also associated with platelet, white blood cell, and lipid traits. Our association results and functional annotation suggest the involvement of new genes in human erythropoiesis. We also confirm that rare and low-frequency variants play a role in the architecture of complex human traits, although their phenotypic effect is generally smaller than originally anticipated.
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Affiliation(s)
- Nathalie Chami
- Department of Medicine, Université de Montréal, Montréal, QC H3T 1J4, Canada; Montreal Heart Institute, Montréal, QC H1T 1C8, Canada
| | - Ming-Huei Chen
- Population Sciences Branch, National Heart, Lung, and Blood Institute, The Framingham Heart Study, Framingham, MA 01702, USA
| | - Andrew J Slater
- Genetics Target Sciences, GlaxoSmithKline, Research Triangle Park, NC 27709, USA; OmicSoft Corporation, Cary, NC 27513, USA
| | - John D Eicher
- Population Sciences Branch, National Heart, Lung, and Blood Institute, The Framingham Heart Study, Framingham, MA 01702, USA
| | - Evangelos Evangelou
- Department of Epidemiology and Biostatistics, MRC-PHE Centre for Environment and Health, School of Public Health, Imperial College London, London W2 1PG, UK; Department of Hygiene and Epidemiology, University of Ioannina Medical School, Ioannina 45110, Greece
| | - Salman M Tajuddin
- Laboratory of Epidemiology and Population Sciences, National Institute on Aging, NIH, Baltimore, MD 21224, USA
| | - Latisha Love-Gregory
- Department of Medicine, Center of Human Nutrition, Washington University School of Medicine, St Louis, MO 63110, USA
| | - Tim Kacprowski
- Department of Functional Genomics, Interfaculty Institute for Genetics and Functional Genomics, University Medicine, Greifswald and Ernst-Mortiz-Arndt University Greifswald, Greifswald 17475, Germany; DZHK (German Centre for Cardiovascular Research), partner site Greifswald, Greifswald QA, Germany
| | - Ursula M Schick
- The Charles Bronfman Institute for Personalized Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10069, USA
| | - Akihiro Nomura
- Center for Human Genetic Research, Massachusetts General Hospital, Boston, MA 02114, USA; Program in Medical and Population Genetics, Broad Institute, Cambridge, MA 02142, USA; Cardiovascular Research Center, Massachusetts General Hospital, Boston, MA 02114, USA; Department of Medicine, Harvard Medical School, Boston, MA 02115, USA; Division of Cardiovascular Medicine, Kanazawa University, Graduate School of Medical Science, Kanazawa, Ishikawa 9200942, Japan
| | - Ayush Giri
- Division of Epidemiology, Department of Medicine, Institute for Medicine and Public Health, Vanderbilt Genetics Institute, Vanderbilt University, Nashville, TN 37235, USA
| | - Samuel Lessard
- Department of Medicine, Université de Montréal, Montréal, QC H3T 1J4, Canada; Montreal Heart Institute, Montréal, QC H1T 1C8, Canada
| | - Jennifer A Brody
- Department of Medicine, University of Washington, Seattle, WA 98101, USA
| | - Claudia Schurmann
- The Charles Bronfman Institute for Personalized Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10069, USA; The Genetics of Obesity and Related Metabolic Traits Program, Icahn School of Medicine at Mount Sinai, New York, NY 10069, USA
| | - Nathan Pankratz
- Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN 55454, USA
| | - Lisa R Yanek
- Department of Medicine/Division of General Internal Medicine, Johns Hopkins University, School of Medicine, Baltimore, MD 21205, USA
| | - Ani Manichaikul
- Center for Public Health Genomics, University of Virginia, Charlottesville, VA 22908, USA
| | - Raha Pazoki
- Department of Epidemiology, Erasmus, MC Rotterdam 3000, the Netherlands
| | - Evelin Mihailov
- Estonian Genome Center, University of Tartu, Tartu 51010, Estonia
| | - W David Hill
- Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh EH8 9JZ, UK; Department of Psychology, University of Edinburgh, Edinburgh EH8 9JZ, UK
| | - Laura M Raffield
- Department of Genetics, University of North Carolina, Chapel Hill, NC 27514, USA
| | - Amber Burt
- Division of Medical Genetics, Department of Medicine, University of Washington, Seattle, WA 98195, USA
| | - Traci M Bartz
- Department of Biostatistics, University of Washington, Seattle, WA 98195, USA
| | - Diane M Becker
- Department of Medicine/Division of General Internal Medicine, Johns Hopkins University, School of Medicine, Baltimore, MD 21205, USA
| | - Lewis C Becker
- Department of Medicine/Divisions of Cardiology and General Internal Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Eric Boerwinkle
- Human Genetics Center, School of Public Health, University of Texas Health Science Center at Houston, Houston, TX 77030, USA; Human Genome Sequencing Center, Baylor College of Medicine, Houston, TX 77030, USA
| | - Jette Bork-Jensen
- The Novo Nordisk Foundation, Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen 2100, Denmark
| | - Erwin P Bottinger
- The Charles Bronfman Institute for Personalized Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10069, USA
| | - Michelle L O'Donoghue
- TIMI Study Group, Cardiovascular Division, Brigham and Women's Hospital, Boston, MA 02115, USA
| | - David R Crosslin
- Department of Biomedical Informatics and Medical Education, University of Washington, Seattle, WA 98195, USA
| | - Simon de Denus
- Montreal Heart Institute, Montréal, QC H1T 1C8, Canada; Faculty of Pharmacy, Université de Montréal, Montréal, QC H3T 1J4, Canada
| | - Marie-Pierre Dubé
- Department of Medicine, Université de Montréal, Montréal, QC H3T 1J4, Canada; Montreal Heart Institute, Montréal, QC H1T 1C8, Canada
| | - Paul Elliott
- Department of Epidemiology and Biostatistics, MRC-PHE Centre for Environment and Health, School of Public Health, Imperial College London, London W2 1PG, UK
| | - Gunnar Engström
- Department of Clinical Sciences, Malmö, Lund University, Malmö 221 00, Sweden; Skåne University Hospital, Malmö 222 41, Sweden
| | - Michele K Evans
- Laboratory of Epidemiology and Population Sciences, National Institute on Aging, NIH, Baltimore, MD 21224, USA
| | - James S Floyd
- Department of Medicine, University of Washington, Seattle, WA 98101, USA
| | - Myriam Fornage
- Institute of Molecular Medicine, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA
| | - He Gao
- Department of Epidemiology and Biostatistics, MRC-PHE Centre for Environment and Health, School of Public Health, Imperial College London, London W2 1PG, UK
| | - Andreas Greinacher
- Institute for Immunology and Transfusion Medicine, University Medicine Greifswald, Greifswald 17475, Germany
| | - Vilmundur Gudnason
- Icelandic Heart Association, 201 Kopavogur, Iceland; Faculty of Medicine, University of Iceland, 101 Reykjavik, Iceland
| | - Torben Hansen
- The Novo Nordisk Foundation, Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen 2100, Denmark
| | - Tamara B Harris
- Laboratory of Epidemiology, Demography, and Biometry, National Institute on Aging, Intramural Research Program, NIH, Bethesda, MD 20892, USA
| | - Caroline Hayward
- MRC Human Genetics Unit, Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh EH4 2XU, UK
| | - Jussi Hernesniemi
- Department of Clinical Chemistry, Fimlab Laboratories, Tampere 33520, Finland; Department of Clinical Chemistry, University of Tampere School of Medicine, Tampere 33014, Finland; University of Tampere, School of Medicine, Tampere 33014, Finland
| | - Heather M Highland
- Human Genetics Center, School of Public Health, University of Texas Health Science Center at Houston, Houston, TX 77030, USA; Department of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27514, USA
| | - Joel N Hirschhorn
- Program in Medical and Population Genetics, Broad Institute, Cambridge, MA 02142, USA; Department of Endocrinology, Boston Children's Hospital, Boston, MA 02115, USA
| | - Albert Hofman
- Department of Epidemiology, Erasmus, MC Rotterdam 3000, the Netherlands; Department of Epidemiology, Harvard TH Chan School of Public Health, Boston, MA 02115, USA
| | - Marguerite R Irvin
- Department of Epidemiology, School of Public Health, University of Alabama at Birmingham, Birmingham, AL 35233, USA
| | - Mika Kähönen
- Department of Clinical Physiology, Tampere University Hospital, Tampere 33521, Finland; Department of Clinical Physiology, University of Tampere School of Medicine, Tampere 33014, Finland
| | - Ethan Lange
- Departments of Genetics and Biostatistics, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Lenore J Launer
- Laboratory of Epidemiology, Demography, and Biometry, National Institute on Aging, Intramural Research Program, NIH, Bethesda, MD 20892, USA
| | - Terho Lehtimäki
- Department of Clinical Chemistry, Fimlab Laboratories, Tampere 33520, Finland; Department of Clinical Chemistry, University of Tampere School of Medicine, Tampere 33014, Finland
| | - Jin Li
- Department of Medicine, Division of Cardiovascular Medicine, Stanford University, School of Medicine, Palo Alto, CA 94305, USA
| | - David C M Liewald
- Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh EH8 9JZ, UK; Department of Psychology, University of Edinburgh, Edinburgh EH8 9JZ, UK
| | - Allan Linneberg
- Research Centre for Prevention and Health, The Capital Region of Denmark, Copenhagen 2600, Denmark; Department of Clinical Experimental Research, Rigshospitalet, Glostrup 2100, Denmark; Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen 2200, Denmark
| | - Yongmei Liu
- Center for Human Genetics, Division of Public Health Sciences, Wake Forest School of Medicine, Winston-Salem, NC 27157, USA
| | - Yingchang Lu
- The Charles Bronfman Institute for Personalized Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10069, USA; The Genetics of Obesity and Related Metabolic Traits Program, Icahn School of Medicine at Mount Sinai, New York, NY 10069, USA
| | - Leo-Pekka Lyytikäinen
- Department of Clinical Chemistry, Fimlab Laboratories, Tampere 33520, Finland; Department of Clinical Chemistry, University of Tampere School of Medicine, Tampere 33014, Finland
| | - Reedik Mägi
- Estonian Genome Center, University of Tartu, Tartu 51010, Estonia
| | - Rasika A Mathias
- Department of Medicine, Divisions of Allergy and Clinical Immunology and General Internal Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Olle Melander
- Department of Clinical Sciences, Malmö, Lund University, Malmö 221 00, Sweden; Skåne University Hospital, Malmö 222 41, Sweden
| | - Andres Metspalu
- Estonian Genome Center, University of Tartu, Tartu 51010, Estonia
| | - Nina Mononen
- Department of Clinical Chemistry, Fimlab Laboratories, Tampere 33520, Finland; Department of Clinical Chemistry, University of Tampere School of Medicine, Tampere 33014, Finland
| | - Mike A Nalls
- Laboratory of Neurogenetics, National Institute on Aging, NIH, Bethesda, MD 20892, USA
| | - Deborah A Nickerson
- Department of Genome Sciences, University of Washington, Seattle, WA 98105, USA
| | - Kjell Nikus
- University of Tampere, School of Medicine, Tampere 33014, Finland; Department of Cardiology, Heart Center, Tampere University Hospital, Tampere 33521, Finland
| | - Chris J O'Donnell
- Population Sciences Branch, National Heart, Lung, and Blood Institute, The Framingham Heart Study, Framingham, MA 01702, USA; Cardiology Section and Center for Population Genomics, Boston Veteran's Administration (VA) Healthcare, Boston, MA 02118, USA
| | - Marju Orho-Melander
- Department of Clinical Sciences, Malmö, Lund University, Malmö 221 00, Sweden; Skåne University Hospital, Malmö 222 41, Sweden
| | - Oluf Pedersen
- The Novo Nordisk Foundation, Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen 2100, Denmark
| | - Astrid Petersmann
- Institute of Clinical Chemistry and Laboratory Medicine, University Medicine Greifswald, Greifswald 17475, Germany
| | - Linda Polfus
- Human Genetics Center, School of Public Health, University of Texas Health Science Center at Houston, Houston, TX 77030, USA
| | - Bruce M Psaty
- Cardiovascular Health Research Unit, Departments of Medicine Epidemiology and Health Services, University of Washington, Seattle, WA 98101, USA; Group Health Research Institute, Group Health Cooperative, Seattle, WA 98101, USA
| | - Olli T Raitakari
- Department of Clinical Physiology and Nuclear Medicine, Turku University Hospital, Turku 20521, Finland; Research Centre of Applied and Preventive Cardiovascular Medicine, University of Turku, Turku 20520, Finland
| | - Emma Raitoharju
- Department of Clinical Chemistry, Fimlab Laboratories, Tampere 33520, Finland; Department of Clinical Chemistry, University of Tampere School of Medicine, Tampere 33014, Finland
| | - Melissa Richard
- Institute of Molecular Medicine, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA
| | - Kenneth M Rice
- Department of Biostatistics, University of Washington, Seattle, WA 98195, USA
| | - Fernando Rivadeneira
- Department of Epidemiology, Erasmus, MC Rotterdam 3000, the Netherlands; Department of Internal Medicine, Erasmus MC, Rotterdam 3000, the Netherlands; Netherlands Consortium for Healthy Ageing (NCHA), Rotterdam 3015, the Netherlands
| | - Jerome I Rotter
- Institute for Translational Genomics and Population Sciences, Los Angeles Biomedical Research Institute, Torrance, CA 90502, USA; Department of Pediatrics, Harbor-UCLA Medical Center, Torrance, CA 90502, USA
| | - Frank Schmidt
- Department of Functional Genomics, Interfaculty Institute for Genetics and Functional Genomics, University Medicine, Greifswald and Ernst-Mortiz-Arndt University Greifswald, Greifswald 17475, Germany
| | - Albert Vernon Smith
- Icelandic Heart Association, 201 Kopavogur, Iceland; Faculty of Medicine, University of Iceland, 101 Reykjavik, Iceland
| | - John M Starr
- Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh EH8 9JZ, UK; Alzheimer Scotland Research Centre, Edinburgh EH8 9JZ, UK
| | - Kent D Taylor
- Institute for Translational Genomics and Population Sciences, Los Angeles Biomedical Research Institute, Torrance, CA 90502, USA; Department of Pediatrics, Harbor-UCLA Medical Center, Torrance, CA 90502, USA
| | - Alexander Teumer
- Institute for Community Medicine, University Medicine Greifswald, Greifswald 17475, Germany
| | - Betina H Thuesen
- Research Centre for Prevention and Health, The Capital Region of Denmark, Copenhagen 2600, Denmark
| | - Eric S Torstenson
- Division of Epidemiology, Department of Medicine, Institute for Medicine and Public Health, Vanderbilt Genetics Institute, Vanderbilt University, Nashville, TN 37235, USA
| | - Russell P Tracy
- Departments of Pathology and Laboratory Medicine and Biochemistry, University of Vermont College of Medicine, Colchester, VT 05446, USA
| | - Ioanna Tzoulaki
- Department of Epidemiology and Biostatistics, MRC-PHE Centre for Environment and Health, School of Public Health, Imperial College London, London W2 1PG, UK; Department of Hygiene and Epidemiology, University of Ioannina Medical School, Ioannina 45110, Greece
| | - Neil A Zakai
- Departments of Medicine and Pathology, University of Vermont College of Medicine, Burlington, VT 05405, USA
| | - Caterina Vacchi-Suzzi
- Department of Family Population and Preventive Medicine, Stony Brook University, Stony Brook, NY 11794, USA
| | | | | | - Mary Cushman
- Departments of Medicine and Pathology, University of Vermont College of Medicine, Burlington, VT 05405, USA
| | - Ian J Deary
- Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh EH8 9JZ, UK; Department of Psychology, University of Edinburgh, Edinburgh EH8 9JZ, UK
| | - Digna R Velez Edwards
- Vanderbilt Epidemiology Center, Department of Obstetrics & Gynecology, Institute for Medicine and Public Health, Vanderbilt Genetics Institute, Vanderbilt University, Nashville, TN 37203, USA
| | - Anne-Claire Vergnaud
- Department of Epidemiology and Biostatistics, MRC-PHE Centre for Environment and Health, School of Public Health, Imperial College London, London W2 1PG, UK
| | - Lars Wallentin
- Department of Medical Sciences, Cardiology and Uppsala Clinical Research Center, Uppsala University, Uppsala 751 85, Sweden
| | - Dawn M Waterworth
- Genetics Target Sciences, GlaxoSmithKline, King of Prussia, PA 19406, USA
| | - Harvey D White
- Green Lane Cardiovascular Service, Auckland City Hospital and University of Auckland, Auckland 1142, New Zealand
| | - James G Wilson
- Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, MS 39216, USA
| | - Alan B Zonderman
- Laboratory of Epidemiology and Population Sciences, National Institute on Aging, NIH, Baltimore, MD 21224, USA
| | - Sekar Kathiresan
- Center for Human Genetic Research, Massachusetts General Hospital, Boston, MA 02114, USA; Program in Medical and Population Genetics, Broad Institute, Cambridge, MA 02142, USA; Cardiovascular Research Center, Massachusetts General Hospital, Boston, MA 02114, USA; Department of Medicine, Harvard Medical School, Boston, MA 02115, USA
| | - Niels Grarup
- The Novo Nordisk Foundation, Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen 2100, Denmark
| | - Tõnu Esko
- Program in Medical and Population Genetics, Broad Institute, Cambridge, MA 02142, USA; Estonian Genome Center, University of Tartu, Tartu 51010, Estonia
| | - Ruth J F Loos
- The Charles Bronfman Institute for Personalized Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10069, USA; The Genetics of Obesity and Related Metabolic Traits Program, Icahn School of Medicine at Mount Sinai, New York, NY 10069, USA; The Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10069, USA
| | - Leslie A Lange
- Department of Genetics, University of North Carolina, Chapel Hill, NC 27514, USA
| | - Nauder Faraday
- Department of Anesthesiology & Critical Care Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Nada A Abumrad
- Department of Medicine, Center of Human Nutrition, Washington University School of Medicine, St Louis, MO 63110, USA
| | - Todd L Edwards
- Division of Epidemiology, Department of Medicine, Institute for Medicine and Public Health, Vanderbilt Genetics Institute, Vanderbilt University, Nashville, TN 37235, USA
| | - Santhi K Ganesh
- Departments of Internal Medicine and Human Genetics, University of Michigan, Ann Arbor, MI 48108, USA
| | - Paul L Auer
- Zilber School of Public Health, University of Wisconsin-Milwaukee, Milwaukee, WI 53205, USA
| | - Andrew D Johnson
- Population Sciences Branch, National Heart, Lung, and Blood Institute, The Framingham Heart Study, Framingham, MA 01702, USA
| | - Alexander P Reiner
- Department of Epidemiology, University of Washington, Seattle, WA 98195, USA; Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.
| | - Guillaume Lettre
- Department of Medicine, Université de Montréal, Montréal, QC H3T 1J4, Canada; Montreal Heart Institute, Montréal, QC H1T 1C8, Canada.
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Wyles SP, Hrstka SC, Reyes S, Terzic A, Olson TM, Nelson TJ. Pharmacological Modulation of Calcium Homeostasis in Familial Dilated Cardiomyopathy: An In Vitro Analysis From an RBM20 Patient-Derived iPSC Model. Clin Transl Sci 2016; 9:158-67. [PMID: 27105042 PMCID: PMC4902766 DOI: 10.1111/cts.12393] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Accepted: 03/22/2016] [Indexed: 12/16/2022] Open
Abstract
For inherited cardiomyopathies, abnormal sensitivity to intracellular calcium (Ca(2+) ), incurred from genetic mutations, initiates subsequent molecular events leading to pathological remodeling. Here, we characterized the effect of β-adrenergic stress in familial dilated cardiomyopathy (DCM) using human-induced pluripotent stem cell (hiPSC)-derived cardiomyocytes (CMs) from a patient with RBM20 DCM. Our findings suggest that β-adrenergic stimulation accelerated defective Ca(2+) homeostasis, apoptotic changes, and sarcomeric disarray in familial DCM hiPSC-CMs. Furthermore, pharmacological modulation of abnormal Ca(2+) handling by pretreatment with β-blocker, carvedilol, or Ca(2+) -channel blocker, verapamil, significantly decreased the area under curve, reduced percentage of disorganized cells, and decreased terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate nick-end labeling (TUNEL)-positive apoptotic loci in familial DCM hiPSC-CMs after β-adrenergic stimulation. These translational data provide patient-based in vitro analysis of β-adrenergic stress in RBM20-deficient familial DCM hiPSC-CMs and evaluation of therapeutic interventions to modify heart disease progression, which may be personalized, but more importantly generalized in the clinic.
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Affiliation(s)
- S P Wyles
- Center for Clinical and Translational Sciences, Mayo Clinic, Rochester, Minnesota, USA.,Center for Regenerative Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - S C Hrstka
- Division of Cardiovascular Diseases, Mayo Clinic, Rochester, Minnesota, USA.,Division of General Internal Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - S Reyes
- Division of Cardiovascular Diseases, Mayo Clinic, Rochester, Minnesota, USA.,Division of General Internal Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - A Terzic
- Center for Regenerative Medicine, Mayo Clinic, Rochester, Minnesota, USA.,Division of Cardiovascular Diseases, Mayo Clinic, Rochester, Minnesota, USA.,Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, Minnesota, USA.,Department of Medical Genetics, Mayo Clinic, Rochester, Minnesota, USA
| | - T M Olson
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, Minnesota, USA.,Division of Pediatric Cardiology, Mayo Clinic, Rochester, Minnesota, USA.,Cardiovascular Genetics Research Laboratory, Mayo Clinic, Rochester, Minnesota, USA
| | - T J Nelson
- Center for Clinical and Translational Sciences, Mayo Clinic, Rochester, Minnesota, USA.,Center for Regenerative Medicine, Mayo Clinic, Rochester, Minnesota, USA.,Division of General Internal Medicine, Mayo Clinic, Rochester, Minnesota, USA.,Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, Minnesota, USA.,Transplant Center, Mayo Clinic, Rochester, Minnesota, USA
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37
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Ladd AN. New Insights Into the Role of RNA-Binding Proteins in the Regulation of Heart Development. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2016; 324:125-85. [PMID: 27017008 DOI: 10.1016/bs.ircmb.2015.12.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The regulation of gene expression during development takes place both at the transcriptional and posttranscriptional levels. RNA-binding proteins (RBPs) regulate pre-mRNA processing, mRNA localization, stability, and translation. Many RBPs are expressed in the heart and have been implicated in heart development, function, or disease. This chapter will review the current knowledge about RBPs in the developing heart, focusing on those that regulate posttranscriptional gene expression. The involvement of RBPs at each stage of heart development will be considered in turn, including the establishment of specific cardiac cell types and formation of the primitive heart tube, cardiac morphogenesis, and postnatal maturation and aging. The contributions of RBPs to cardiac birth defects and heart disease will also be considered in these contexts. Finally, the interplay between RBPs and other regulatory factors in the developing heart, such as transcription factors and miRNAs, will be discussed.
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Affiliation(s)
- A N Ladd
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, United States of America.
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38
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Wyles SP, Li X, Hrstka SC, Reyes S, Oommen S, Beraldi R, Edwards J, Terzic A, Olson TM, Nelson TJ. Modeling structural and functional deficiencies of RBM20 familial dilated cardiomyopathy using human induced pluripotent stem cells. Hum Mol Genet 2015; 25:254-65. [PMID: 26604136 DOI: 10.1093/hmg/ddv468] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2015] [Accepted: 11/09/2015] [Indexed: 12/16/2022] Open
Abstract
Dilated cardiomyopathy (DCM) is a leading cause of heart failure. In families with autosomal-dominant DCM, heterozygous missense mutations were identified in RNA-binding motif protein 20 (RBM20), a spliceosome protein induced during early cardiogenesis. Dermal fibroblasts from two unrelated patients harboring an RBM20 R636S missense mutation were reprogrammed to human induced pluripotent stem cells (hiPSCs) and differentiated to beating cardiomyocytes (CMs). Stage-specific transcriptome profiling identified differentially expressed genes ranging from angiogenesis regulator to embryonic heart transcription factor as initial molecular aberrations. Furthermore, gene expression analysis for RBM20-dependent splice variants affected sarcomeric (TTN and LDB3) and calcium (Ca(2+)) handling (CAMK2D and CACNA1C) genes. Indeed, RBM20 hiPSC-CMs exhibited increased sarcomeric length (RBM20: 1.747 ± 0.238 µm versus control: 1.404 ± 0.194 µm; P < 0.0001) and decreased sarcomeric width (RBM20: 0.791 ± 0.609 µm versus control: 0.943 ± 0.166 µm; P < 0.0001). Additionally, CMs showed defective Ca(2+) handling machinery with prolonged Ca(2+) levels in the cytoplasm as measured by greater area under the curve (RBM20: 814.718 ± 94.343 AU versus control: 206.941 ± 22.417 AU; P < 0.05) and higher Ca(2+) spike amplitude (RBM20: 35.281 ± 4.060 AU versus control:18.484 ± 1.518 AU; P < 0.05). β-adrenergic stress induced with 10 µm norepinephrine demonstrated increased susceptibility to sarcomeric disorganization (RBM20: 86 ± 10.5% versus control: 40 ± 7%; P < 0.001). This study features the first hiPSC model of RBM20 familial DCM. By monitoring human cardiac disease according to stage-specific cardiogenesis, this study demonstrates RBM20 familial DCM is a developmental disorder initiated by molecular defects that pattern maladaptive cellular mechanisms of pathological cardiac remodeling. Indeed, hiPSC-CMs recapitulate RBM20 familial DCM phenotype in a dish and establish a tool to dissect disease-relevant defects in RBM20 splicing as a global regulator of heart function.
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Affiliation(s)
- Saranya P Wyles
- Center for Clinical and Translational Sciences, Center for Regenerative Medicine
| | - Xing Li
- Department of Health Sciences Research, Division of Biomedical Statistics and Informatics
| | | | | | - Saji Oommen
- Division of General Internal Medicine, Department of Molecular Pharmacology and Experimental Therapeutics
| | - Rosanna Beraldi
- Children's Hospital Research Center, Sanford Research, Sioux Falls, SD 57104, USA
| | | | - Andre Terzic
- Center for Regenerative Medicine, Division of Cardiovascular Diseases, Department of Molecular Pharmacology and Experimental Therapeutics, Department of Medical Genetics
| | - Timothy M Olson
- Department of Molecular Pharmacology and Experimental Therapeutics, Division of Pediatric Cardiology, Cardiovascular Genetics Research Laboratory and
| | - Timothy J Nelson
- Center for Regenerative Medicine, Division of General Internal Medicine, Department of Molecular Pharmacology and Experimental Therapeutics, Division of Pediatric Cardiology, Transplant Center, Mayo Clinic, Rochester, MN 55905, USA and
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Next generation sequencing in cardiomyopathy: towards personalized genomics and medicine. Mol Biol Rep 2015; 41:4881-8. [PMID: 24908287 DOI: 10.1007/s11033-014-3418-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Next generation sequencing (NGS) is perhaps one of the most exciting advances in the field of life sciences and biomedical research in the last decade. With the availability of massive parallel sequencing, human DNA blueprint can be decoded to explore the hidden information with reduced time and cost. This technology has been used to understand the genetic aspects of various diseases including cardiomyopathies. Mutations for different cardiomyopathies have been identified and cataloging mutations on phenotypic basis are underway and are expected to lead to new discoveries that may translate to novel diagnostic, prognostic and therapeutic targets. With ease in handling NGS, cost effectiveness and fast data output, NGS is now considered as a diagnostic tool for cardiomyopathy by providing targeted gene sequencing. In addition to the number of genetic variants that are identified in cardiomyopathies, there is a need of quicker and easy way to screen multiple genes associated with the disease. In this review, an attempt has been made to explain the NGS technology, methods and applications in cardiomyopathies and their perspective in clinical practice and challenges which are to be addressed.
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40
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QU XINKAI, YUAN FANG, LI RUOGU, XU LEI, JING WEIFENG, LIU HUA, XU YINGJIA, ZHANG MIN, LIU XU, FANG WEIYI, YANG YIQING, QIU XINGBIAO. Prevalence and spectrum of LRRC10 mutations associated with idiopathic dilated cardiomyopathy. Mol Med Rep 2015; 12:3718-3724. [DOI: 10.3892/mmr.2015.3843] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Accepted: 05/01/2015] [Indexed: 11/06/2022] Open
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Abstract
PURPOSE OF REVIEW Detection of high-impact variants on lipid traits is complicated by complex genetic architecture. Although genome-wide association studies (GWAS) successfully identified many novel genes associated with lipid traits, it was less successful in identifying variants with a large impact on the phenotype. This is not unexpected, as the more common variants detectable by GWAS typically have small effects. The availability of large familial datasets and sequence data has changed the paradigm for successful genomic discovery of the novel genes and pathogenic variants underlying lipid disorders. RECENT FINDINGS Novel loci with large effects have been successfully mapped in families, and next-generation sequencing allowed for the identification of the underlying lipid-associated variants of large effect size. The success of this strategy relies on the simplification of the underlying genetic variation by focusing on large single families segregating extreme lipid phenotypes. SUMMARY Rare, high-impact variants are expected to have large effects and be more relevant for medical and pharmaceutical applications. Family data have many advantages over population-based data because they allow for the efficient detection of high-impact variants with an exponentially smaller sample size and increased power for follow-up studies.
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Affiliation(s)
- Elisabeth Rosenthal
- Department of Medicine (Medical Genetics), University of Washington, Seattle, Seattle, Washington, USA
| | - Elizabeth Blue
- Department of Medicine (Medical Genetics), University of Washington, Seattle, Seattle, Washington, USA
| | - Gail P. Jarvik
- Department of Medicine (Medical Genetics), University of Washington, Seattle, Seattle, Washington, USA
- Department of Genome Sciences, University of Washington, Seattle, Seattle, Washington, USA
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Cieply B, Carstens RP. Functional roles of alternative splicing factors in human disease. WILEY INTERDISCIPLINARY REVIEWS-RNA 2015; 6:311-26. [PMID: 25630614 PMCID: PMC4671264 DOI: 10.1002/wrna.1276] [Citation(s) in RCA: 101] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Revised: 12/17/2014] [Accepted: 12/18/2014] [Indexed: 12/13/2022]
Abstract
Alternative splicing (AS) is an important mechanism used to generate greater transcriptomic and proteomic diversity from a finite genome. Nearly all human gene transcripts are alternatively spliced and can produce protein isoforms with divergent and even antagonistic properties that impact cell functions. Many AS events are tightly regulated in a cell-type or tissue-specific manner, and at different developmental stages. AS is regulated by RNA-binding proteins, including cell- or tissue-specific splicing factors. In the past few years, technological advances have defined genome-wide programs of AS regulated by increasing numbers of splicing factors. These splicing regulatory networks (SRNs) consist of transcripts that encode proteins that function in coordinated and related processes that impact the development and phenotypes of different cell types. As such, it is increasingly recognized that disruption of normal programs of splicing regulated by different splicing factors can lead to human diseases. We will summarize examples of diseases in which altered expression or function of splicing regulatory proteins has been implicated in human disease pathophysiology. As the role of AS continues to be unveiled in human disease and disease risk, it is hoped that further investigations into the functions of numerous splicing factors and their regulated targets will enable the development of novel therapies that are directed at specific AS events as well as the biological pathways they impact. WIREs RNA 2015, 6:311–326. doi: 10.1002/wrna.1276 For further resources related to this article, please visit the http://wires.wiley.com/remdoi.cgi?doi=10.1002/wrna.1276WIREs website. Conflict of interest: The authors have declared no conflicts of interest for this article.
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Affiliation(s)
- Benjamin Cieply
- Departments of Medicine (Renal) and Genetics, University of Pennsylvania, Perelman School of Medicine, Philadelphia, PA, USA
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43
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Nonsense Mutations in BAG3 are Associated With Early-Onset Dilated Cardiomyopathy in French Canadians. Can J Cardiol 2014; 30:1655-61. [DOI: 10.1016/j.cjca.2014.09.030] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2014] [Revised: 09/10/2014] [Accepted: 09/25/2014] [Indexed: 01/04/2023] Open
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Affiliation(s)
- Ali J Marian
- From the Institute of Molecular Medicine, Center for Cardiovascular Genetic Research, University of Texas Health Science Center, Houston.
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45
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Khuansuwan S, Gamse JT. Identification of differentially expressed genes during development of the zebrafish pineal complex using RNA sequencing. Dev Biol 2014; 395:144-53. [PMID: 25173875 DOI: 10.1016/j.ydbio.2014.08.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Revised: 07/17/2014] [Accepted: 08/17/2014] [Indexed: 02/03/2023]
Abstract
We describe a method for isolating RNA suitable for high-throughput RNA sequencing (RNA-seq) from small numbers of fluorescently labeled cells isolated from live zebrafish (Danio rerio) embryos without using costly, commercially available columns. This method ensures high cell viability after dissociation and suspension of cells and gives a very high yield of intact RNA. We demonstrate the utility of our new protocol by isolating RNA from fluorescence activated cell sorted (FAC sorted) pineal complex neurons in wild-type and tbx2b knockdown embryos at 24 hours post-fertilization. Tbx2b is a transcription factor required for pineal complex formation. We describe a bioinformatics pipeline used to analyze differential expression following high-throughput sequencing and demonstrate the validity of our results using in situ hybridization of differentially expressed transcripts. This protocol brings modern transcriptome analysis to the study of small cell populations in zebrafish.
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Affiliation(s)
- Sataree Khuansuwan
- Department of Biological Sciences, Vanderbilt University, Nashville, TN, USA
| | - Joshua T Gamse
- Department of Biological Sciences, Vanderbilt University, Nashville, TN, USA.
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46
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47
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Weeke P, Muhammad R, Delaney JT, Shaffer C, Mosley JD, Blair M, Short L, Stubblefield T, Roden DM, Darbar D. Whole-exome sequencing in familial atrial fibrillation. Eur Heart J 2014; 35:2477-83. [PMID: 24727801 DOI: 10.1093/eurheartj/ehu156] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
AIMS Positional cloning and candidate gene approaches have shown that atrial fibrillation (AF) is a complex disease with familial aggregation. Here, we employed whole-exome sequencing (WES) in AF kindreds to identify variants associated with familial AF. METHODS AND RESULTS WES was performed on 18 individuals in six modestly sized familial AF kindreds. After filtering very rare variants by multiple metrics, we identified 39 very rare and potentially pathogenic variants [minor allele frequency (MAF) ≤0.04%] in genes not previously associated with AF. Despite stringent filtering >1 very rare variants in the 5/6 of the kindreds were identified, whereas no plausible variants contributing to familial AF were found in 1/6 of the kindreds. Two candidate AF variants in the calcium channel subunit genes (CACNB2 and CACNA2D4) were identified in two separate families using expression data and predicted function. CONCLUSION By coupling family data with exome sequencing, we identified multiple very rare potentially pathogenic variants in five of six families, suggestive of a complex disease mechanism, whereas none were identified in the remaining AF pedigree. This study highlights some important limitations and challenges associated with performing WES in AF including the importance of having large well-curated multi-generational pedigrees, the issue of potential AF misclassification, and limitations of WES technology when applied to a complex disease.
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Affiliation(s)
- Peter Weeke
- Division of Clinical Pharmacology, Vanderbilt University, Nashville, TN, USA Department of Cardiology, Copenhagen University Hospital, Gentofte, Denmark
| | - Raafia Muhammad
- Division of Clinical Pharmacology, Vanderbilt University, Nashville, TN, USA
| | - Jessica T Delaney
- Division of Clinical Pharmacology, Vanderbilt University, Nashville, TN, USA
| | - Christian Shaffer
- Division of Clinical Pharmacology, Vanderbilt University, Nashville, TN, USA
| | - Jonathan D Mosley
- Division of Clinical Pharmacology, Vanderbilt University, Nashville, TN, USA
| | - Marcia Blair
- Division of Clinical Pharmacology, Vanderbilt University, Nashville, TN, USA
| | - Laura Short
- Division of Clinical Pharmacology, Vanderbilt University, Nashville, TN, USA
| | - Tanya Stubblefield
- Division of Clinical Pharmacology, Vanderbilt University, Nashville, TN, USA
| | - Dan M Roden
- Division of Clinical Pharmacology, Vanderbilt University, Nashville, TN, USA Division of Cardiovascular Medicine, Vanderbilt University School of Medicine, 2215B Garland Avenue, Room 1285A MRB IV, Nashville 37323-6602, TN, USA
| | - Dawood Darbar
- Division of Clinical Pharmacology, Vanderbilt University, Nashville, TN, USA Division of Cardiovascular Medicine, Vanderbilt University School of Medicine, 2215B Garland Avenue, Room 1285A MRB IV, Nashville 37323-6602, TN, USA
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Puckelwartz MJ, McNally EM. Genetic profiling for risk reduction in human cardiovascular disease. Genes (Basel) 2014; 5:214-34. [PMID: 24705294 PMCID: PMC3978520 DOI: 10.3390/genes5010214] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Revised: 02/26/2014] [Accepted: 02/27/2014] [Indexed: 11/16/2022] Open
Abstract
Cardiovascular disease is a major health concern affecting over 80,000,000 people in the U.S. alone. Heart failure, cardiomyopathy, heart rhythm disorders, atherosclerosis and aneurysm formation have significant heritable contribution. Supported by familial aggregation and twin studies, these cardiovascular diseases are influenced by genetic variation. Family-based linkage studies and population-based genome-wide association studies (GWAS) have each identified genes and variants important for the pathogenesis of cardiovascular disease. The advent of next generation sequencing has ushered in a new era in the genetic diagnosis of cardiovascular disease, and this is especially evident when considering cardiomyopathy, a leading cause of heart failure. Cardiomyopathy is a genetically heterogeneous disorder characterized by morphologically abnormal heart with abnormal function. Genetic testing for cardiomyopathy employs gene panels, and these panels assess more than 50 genes simultaneously. Despite the large size of these panels, the sensitivity for detecting the primary genetic defect is still only approximately 50%. Recently, there has been a shift towards applying broader exome and/or genome sequencing to interrogate more of the genome to provide a genetic diagnosis for cardiomyopathy. Genetic mutations in cardiomyopathy offer the capacity to predict clinical outcome, including arrhythmia risk, and genetic diagnosis often provides an early window in which to institute therapy. This discussion is an overview as to how genomic data is shaping the current understanding and treatment of cardiovascular disease.
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Beraldi R, Li X, Martinez Fernandez A, Reyes S, Secreto F, Terzic A, Olson TM, Nelson TJ. Rbm20-deficient cardiogenesis reveals early disruption of RNA processing and sarcomere remodeling establishing a developmental etiology for dilated cardiomyopathy. Hum Mol Genet 2014; 23:3779-91. [PMID: 24584570 DOI: 10.1093/hmg/ddu091] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Dilated cardiomyopathy (DCM) due to mutations in RBM20, a gene encoding an RNA-binding protein, is associated with high familial penetrance, risk of progressive heart failure and sudden death. Although genetic investigations and physiological models have established the linkage of RBM20 with early-onset DCM, the underlying basis of cellular and molecular dysfunction is undetermined. Modeling human genetics using a high-throughput pluripotent stem cell platform was herein designed to pinpoint the initial transcriptome dysfunction and mechanistic corruption in disease pathogenesis. Tnnt2-pGreenZeo pluripotent stem cells were engineered to knockdown Rbm20 (shRbm20) to determine the cardiac-pathogenic phenotype during cardiac differentiation. Intracellular Ca(2+) transients revealed Rbm20-dependent alteration in Ca(2+) handling, coinciding with known pathological splice variants of Titin and Camk2d genes by Day 24 of cardiogenesis. Ultrastructural analysis demonstrated elongated and thinner sarcomeres in the absence of Rbm20 that is consistent with human cardiac biopsy samples. Furthermore, Rbm20-depleted transcriptional profiling at Day 12 identified Rbm20-dependent dysregulation with 76% of differentially expressed genes linked to known cardiac pathology ranging from primordial Nkx2.5 to mature cardiac Tnnt2 as the initial molecular aberrations. Notably, downstream consequences of Rbm20-depletion at Day 24 of differentiation demonstrated significant dysregulation of extracellular matrix components such as the anomalous overexpression of the Vtn gene. By using the pluripotent stem cell platform to model human cardiac disease according to a stage-specific cardiogenic roadmap, we established a new paradigm of familial DCM pathogenesis as a developmental disorder that is patterned during early cardiogenesis and propagated with cellular mechanisms of pathological cardiac remodeling.
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Affiliation(s)
| | - Xing Li
- Division of Biomedical Statistics and Informatics, Department of Health Sciences Research
| | | | | | | | - Andre Terzic
- Division of Cardiovascular Diseases, Center of Regenerative Medicine, Division of Pediatric Cardiology, Molecular Pharmacology and Experimental Therapeutics
| | - Timothy M Olson
- Division of Cardiovascular Diseases, Division of Pediatric Cardiology, Molecular Pharmacology and Experimental Therapeutics
| | - Timothy J Nelson
- Center of Regenerative Medicine, Molecular Pharmacology and Experimental Therapeutics, General Internal Medicine and Transplant Center, Mayo Clinic, Rochester, MN 55905, USA
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