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Baudic M, Murata H, Bosada FM, Souto Melo U, Aizawa T, Guedon A, Lindenbaum P, Gourraud JB, Makita N, Mundlos S, Christoffels VM, Makiyama T, Probst V, Schott JJ, Barc J. Syndromic cardiac disorder is associated with a non-coding deletion that induces a 3D chromatin remodeling and PITX2 expression dysregulation. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.2882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
In a first family (family#1), we identified 53 members of whom 17 present a syndromic cardiac disorder characterized by electrical disorders (sinus node dysfunction, atrial fibrillation...) and developmental defects (atrial septal defect, valvopathy, left ventricle non-compaction...) following an autosomal dominant model. Among the affected family members, 6 are implanted with a pacemaker and one experienced a sudden death at 43yo. Despite a strong linkage pointing to the 4q25 region, exome sequencing failed to identify causal variant. Interestingly, 6 additional non-related families presenting the same phenotype have been also identified.
Our aims are to identity the causal mutation and the molecular mechanism underlying this complex cardiac syndrome.
Genetic study has been performed using whole genome sequencing (WGS). Based on transgenic mouse strains, we assessed the impact of Family#1 mutation on the phenotype and on gene expression. Then, we generated human cardiomyocytes derived iPS cells (CM-iPS) isogenic models to evaluate the epigenome (CUT&RUN and ATAC-seq), transcriptome (RNA-seq) and topological associated domain (TAD) remodelling (Hi-C).
By WGS we uncovered a deletion of 15kb in a gene desert area on 4q25, segregating in all affected relatives of Family#1. The 6 other families present overlapping deletions. Mouse model recapitulates the cardiac phenotype and exhibit a dysregulation of Pitx2 expression in cardiac specific compartments. Based on human CM-iPS models, epigenetic data highlight among the 15kb deletion a unique open region containing a CTCF binding site, crucial for delimiting TAD boundaries. Hi-C assay reveals the fusion of 2 TADs and highlights new interactions between PITX2 and atrial specific regulatory elements.
We identified a deletion located within a gene desert area associated with a complex cardiac disorder. The CTCF binding site contained in the deletion seems key in the TAD border. The TAD remodelling leads to new (regulatory) interactions and expression dysregulation of PITX2. We describe a new molecular mechanism implying a yet unidentified non-coding regulatory element of PITX2 and responsible for a complex electrical and developmental cardiac syndrome.
Funding Acknowledgement
Type of funding sources: Public Institution(s). Main funding source(s): Nantes UniversitéFrench national reserch agency (ANR)
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Affiliation(s)
- M Baudic
- Institut du Thorax, Nantes Université, CNRS, INSERM , Nantes , France
| | - H Murata
- Nippon Medical School Hospital, The Department of Cardiovascular Medicine , Tokyo , Japan
| | - F M Bosada
- Amsterdam UMC, University of Amsterdam, Department of Medical Biology , Amsterdam , The Netherlands
| | - U Souto Melo
- Max Planck Institute for Molecular Genetics, RG Development and Disease , Berlin , Germany
| | - T Aizawa
- Kyoto University Graduate School of Medicine, Department of Cardiovascular Medicine , Kyoto , Japan
| | - A Guedon
- Institut du Thorax, Nantes Université, CHU Nantes, CNRS, INSERM , Nantes , France
| | - P Lindenbaum
- Institut du Thorax, Nantes Université, CNRS, INSERM , Nantes , France
| | - J B Gourraud
- Institut du Thorax, Nantes Université, CHU Nantes, CNRS, INSERM , Nantes , France
| | - N Makita
- National Cerebral and Cardiovascular Center, Research Institute and Omics Research Center , Osaka , Japan
| | - S Mundlos
- Max Planck Institute for Molecular Genetics, RG Development and Disease , Berlin , Germany
| | - V M Christoffels
- Amsterdam UMC, University of Amsterdam, Department of Medical Biology , Amsterdam , The Netherlands
| | - T Makiyama
- Kyoto University Graduate School of Medicine, Department of Cardiovascular Medicine , Kyoto , Japan
| | - V Probst
- Institut du Thorax, Nantes Université, CHU Nantes, CNRS, INSERM , Nantes , France
| | - J J Schott
- Institut du Thorax, Nantes Université, CHU Nantes, CNRS, INSERM , Nantes , France
| | - J Barc
- Institut du Thorax, Nantes Université, CNRS, INSERM , Nantes , France
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2
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Delwarde C, Toquet C, Aumond P, Kayvanjoo AH, Foucal A, Le Vely B, Baudic M, Lauzier B, Blandin S, Véziers J, Paul-Gilloteaux P, Lecointe S, Baron E, Massaiu I, Poggio P, Rémy S, Anegon I, Le Marec H, Monassier L, Schott JJ, Mass E, Barc J, Le Tourneau T, Merot J, Capoulade R. Multimodality imaging and transciptomics to phenotype mitral valve dystrophy in a unique knock-in Filamin-A rat model. Cardiovasc Res 2022; 119:759-771. [PMID: 36001550 DOI: 10.1093/cvr/cvac136] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Revised: 06/29/2022] [Accepted: 07/26/2022] [Indexed: 11/12/2022] Open
Abstract
AIMS Degenerative mitral valve dystrophy (MVD) leading to mitral valve prolapse is the most frequent form of MV disease, and there is currently no pharmacological treatment available. The limited understanding of the pathophysiological mechanisms leading to MVD limits our ability to identify therapeutic targets. This study aimed to reveal the main pathophysiological pathways involved in MVD via the multimodality imaging and transcriptomic analysis of the new and unique Knock-In (KI) rat model for the FlnA-P637Q mutation associated-MVD. METHODS AND RESULTS WT and KI rats were evaluated morphologically, functionally, and histologically between 3-week-old and 3-to-6-month-old based on Doppler echocardiography, 3D micro-computed tomography (microCT), and standard histology. RNA-sequencing and Assay for Transposase-Accessible Chromatin (ATAC-seq) were performed on 3-week-old WT and KI mitral valves and valvular cells, respectively, to highlight the main signaling pathways associated with MVD. Echocardiographic exploration confirmed MV elongation (2.0 ± 0.1 mm versus 1.8 ± 0.1, p = 0.001), as well as MV thickening and prolapse in KI animals compared to WT at 3 weeks. 3D MV volume quantified by microCT was significantly increased in KI animals (+58% versus WT, p = 0.02). Histological analyses revealed a myxomatous remodeling in KI MV characterized by proteoglycans accumulation. A persistent phenotype was observed in adult KI rats. Signaling pathways related to extracellular matrix homeostasis, response to molecular stress, epithelial cell migration, endothelial to mesenchymal transition, chemotaxis and immune cell migration, were identified based on RNA-seq analysis. ATAC-seq analysis points to the critical role of TGF-β and inflammation in the disease. CONCLUSION The KI FlnA-P637Q rat model mimics human myxomatous mitral valve dystrophy, offering a unique opportunity to decipher pathophysiological mechanisms related to this disease. Extracellular matrix organization, epithelial cell migration, response to mechanical stress, and a central contribution of immune cells are highlighted as the main signaling pathways leading to myxomatous mitral valve dystrophy. Our findings pave the road to decipher underlying molecular mechanisms and the specific role of distinct cell populations in this context.
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Affiliation(s)
- Constance Delwarde
- Nantes Université, CHU Nantes, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France
| | - Claire Toquet
- Nantes Université, CHU Nantes, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France
| | - Pascal Aumond
- Nantes Université, CHU Nantes, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France
| | - Amir Hossein Kayvanjoo
- Developmental Biology of the Immune System, Life & Medical Sciences (LIMES) Institute, University of Bonn; 53115 Bonn, Germany
| | - Adrien Foucal
- Nantes Université, CHU Nantes, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France
| | - Benjamin Le Vely
- Nantes Université, CHU Nantes, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France
| | - Manon Baudic
- Nantes Université, CHU Nantes, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France
| | - Benjamin Lauzier
- Nantes Université, CHU Nantes, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France
| | - Stéphanie Blandin
- Nantes Université, CHU Nantes, Inserm, CNRS, SFR Santé, Inserm UMS 016, CNRS UAR 3556, F-44000 Nantes, France
| | - Joëlle Véziers
- INSERM, UMR 1229, RMeS, CHU Nantes PHU4 OTONN, Nantes Univ, Nantes, France
| | - Perrine Paul-Gilloteaux
- Nantes Université, CHU Nantes, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France.,Nantes Université, CHU Nantes, Inserm, CNRS, SFR Santé, Inserm UMS 016, CNRS UAR 3556, F-44000 Nantes, France
| | - Simon Lecointe
- Nantes Université, CHU Nantes, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France
| | - Estelle Baron
- Nantes Université, CHU Nantes, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France
| | | | - Paolo Poggio
- Centro Cardiologico Monzino IRCCS, Milano, Italy
| | - Séverine Rémy
- INSERM UMR 1064-CR2TI, Transgenic Rats ImmunoPhenomic, Nantes, France
| | - Ignacio Anegon
- INSERM UMR 1064-CR2TI, Transgenic Rats ImmunoPhenomic, Nantes, France
| | - Hervé Le Marec
- Nantes Université, CHU Nantes, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France
| | - Laurent Monassier
- Laboratoire de Pharmacologie et Toxicologie NeuroCardiovasculaire UR7296, Université de Strasbourg, Strasbourg, France
| | - Jean Jacques Schott
- Nantes Université, CHU Nantes, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France
| | - Elvira Mass
- Developmental Biology of the Immune System, Life & Medical Sciences (LIMES) Institute, University of Bonn; 53115 Bonn, Germany
| | - Julien Barc
- Nantes Université, CHU Nantes, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France
| | - Thierry Le Tourneau
- Nantes Université, CHU Nantes, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France
| | - Jean Merot
- Nantes Université, CHU Nantes, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France
| | - Romain Capoulade
- Nantes Université, CHU Nantes, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France
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3
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Boureau AS, Karakachoff M, Le Scouarnec S, Capoulade R, Cueff C, de Decker L, Senage T, Verhoye JP, Baufreton C, Roussel JC, Dina C, Probst V, Schott JJ, Le Tourneau T. Heritability of aortic valve stenosis and bicuspid enrichment in families with aortic valve stenosis. Int J Cardiol 2022; 359:91-98. [DOI: 10.1016/j.ijcard.2022.04.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Revised: 03/10/2022] [Accepted: 04/08/2022] [Indexed: 11/05/2022]
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4
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Roselli C, Yu M, Nauffal V, Georges A, Yang Q, Love K, Weng LC, Delling FN, Maurya SR, Schrölkamp M, Tfelt-Hansen J, Hagège A, Jeunemaitre X, Debette S, Amouyel P, Guan W, Muehlschlegel JD, Body SC, Shah S, Samad Z, Kyryachenko S, Haynes C, Rienstra M, Le Tourneau T, Probst V, Roussel R, Wijdh-Den Hamer IJ, Siland JE, Knowlton KU, Jacques Schott J, Levine RA, Benjamin EJ, Vasan RS, Horne BD, Muhlestein JB, Benfari G, Enriquez-Sarano M, Natale A, Mohanty S, Trivedi C, Shoemaker MB, Yoneda ZT, Wells QS, Baker MT, Farber-Eger E, Michelena HI, Lundby A, Norris RA, Slaugenhaupt SA, Dina C, Lubitz SA, Bouatia-Naji N, Ellinor PT, Milan DJ. Genome-wide association study reveals novel genetic loci: a new polygenic risk score for mitral valve prolapse. Eur Heart J 2022; 43:1668-1680. [PMID: 35245370 PMCID: PMC9649914 DOI: 10.1093/eurheartj/ehac049] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 08/18/2021] [Accepted: 02/01/2022] [Indexed: 11/12/2022] Open
Abstract
AIMS Mitral valve prolapse (MVP) is a common valvular heart disease with a prevalence of >2% in the general adult population. Despite this high incidence, there is a limited understanding of the molecular mechanism of this disease, and no medical therapy is available for this disease. We aimed to elucidate the genetic basis of MVP in order to better understand this complex disorder. METHODS AND RESULTS We performed a meta-analysis of six genome-wide association studies that included 4884 cases and 434 649 controls. We identified 14 loci associated with MVP in our primary analysis and 2 additional loci associated with a subset of the samples that additionally underwent mitral valve surgery. Integration of epigenetic, transcriptional, and proteomic data identified candidate MVP genes including LMCD1, SPTBN1, LTBP2, TGFB2, NMB, and ALPK3. We created a polygenic risk score (PRS) for MVP and showed an improved MVP risk prediction beyond age, sex, and clinical risk factors. CONCLUSION We identified 14 genetic loci that are associated with MVP. Multiple analyses identified candidate genes including two transforming growth factor-β signalling molecules and spectrin β. We present the first PRS for MVP that could eventually aid risk stratification of patients for MVP screening in a clinical setting. These findings advance our understanding of this common valvular heart disease and may reveal novel therapeutic targets for intervention.
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Affiliation(s)
- Carolina Roselli
- Cardiovascular Disease Initiative, The Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA,Department of Cardiology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Mengyao Yu
- Université de Paris, PARCC, Inserm, F-75015 Paris, France
| | - Victor Nauffal
- Cardiovascular Disease Initiative, The Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA,Division of Cardiovascular Medicine, Brigham and Women’s Hospital, Boston, MA, USA
| | - Adrien Georges
- Université de Paris, PARCC, Inserm, F-75015 Paris, France
| | - Qiong Yang
- School of Public Health, Boston University, Boston, MA, USA
| | - Katie Love
- Cardiovascular Research Center, Massachusetts General Hospital, Boston, MA, USA
| | - Lu Chen Weng
- Cardiovascular Disease Initiative, The Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA,Cardiovascular Research Center, Massachusetts General Hospital, Boston, MA, USA
| | - Francesca N Delling
- Division of Cardiology, University of California San Francisco, San Francisco, CA, USA
| | - Svetlana R Maurya
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, København 2200, Denmark
| | - Maren Schrölkamp
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, København 2200, Denmark
| | - Jacob Tfelt-Hansen
- Department of Cardiology, The Heart Centre, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark,Department of Forensic Medicine, Faculty of Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Albert Hagège
- Université de Paris, PARCC, Inserm, F-75015 Paris, France,Assistance Publique–Hôpitaux de Paris, Departments of Cardiology and Genetics, Hôpital Européen Georges Pompidou, 75015 Paris, France
| | - Xavier Jeunemaitre
- Université de Paris, PARCC, Inserm, F-75015 Paris, France,Assistance Publique–Hôpitaux de Paris, Departments of Cardiology and Genetics, Hôpital Européen Georges Pompidou, 75015 Paris, France
| | - Stéphanie Debette
- Bordeaux Population Health Research Center, Inserm Center U1219, University of Bordeaux, Bordeaux, France,Department of Neurology, Bordeaux University Hospital, Inserm U1219, Bordeaux, France
| | - Philippe Amouyel
- Univ. Lille, Inserm, Centre Hosp. Univ Lille, Institut Pasteur de Lille, UMR1167 – RID-AGE- Risk factors and molecular determinants of aging-related diseases, F-59000 Lille, France
| | - Wyliena Guan
- Cardiovascular Disease Initiative, The Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA,Cardiovascular Research Center, Massachusetts General Hospital, Boston, MA, USA,Demoulas Center for Cardiac Arrhythmias, Massachusetts General Hospital, Boston, MA, USA
| | - Jochen D Muehlschlegel
- Department of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women’s Hospital, Boston, MA, USA
| | - Simon C Body
- Department of Anesthesiology, Boston University School of Medicine, Boston, MA, USA
| | - Svati Shah
- Duke Molecular Physiology Institute, Duke University, Durham, NC, USA,Division of Cardiology, Department of Medicine, Duke University School of Medicine, Durham, NC, USA
| | - Zainab Samad
- Division of Cardiology, Department of Medicine, Duke University School of Medicine, Durham, NC, USA,Department of Medicine, Aga Khan University, Karachi, Pakistan
| | | | - Carol Haynes
- Duke Molecular Physiology Institute, Duke University, Durham, NC, USA
| | - Michiel Rienstra
- Department of Cardiology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Thierry Le Tourneau
- l’institut du thorax, INSERM, CNRS, Univ Nantes, CHU Nantes, Nantes, France,l’institut du thorax, CHU Nantes, Nantes, France
| | - Vincent Probst
- l’institut du thorax, INSERM, CNRS, Univ Nantes, CHU Nantes, Nantes, France
| | - Ronan Roussel
- Cordeliers Research Centre, ImMeDiab Team, INSERM, Université de Paris, Paris, France,Hôpital Bichat-Claude-Bernard, APHP, Department of Diabetology, Paris, France
| | - Inez J Wijdh-Den Hamer
- Department of Cardiothoracic Surgery, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Joylene E Siland
- Department of Cardiology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Kirk U Knowlton
- Intermountain Medical Center Heart Institute, Salt Lake City, UT, USA,Division of Cardiovascular Medicine, Department of Medicine, University of California San Diego, San Diego, CA, USA
| | | | - Robert A Levine
- Cardiac Ultrasound Laboratory, Harvard Medical School, Massachusetts General Hospital, Boston, MA, USA
| | - Emelia J Benjamin
- National Heart, Lung, and Blood Institute’s and Boston University’s, The Framingham Heart Study, Framingham, MA, USA,Section of Cardiovascular Medicine, Boston University School of Medicine, Boston, MA, USA,Department of Epidemiology, Boston University School of Public Health, Boston, MA, USA
| | - Ramachandran S Vasan
- School of Public Health, Boston University, Boston, MA, USA,National Heart, Lung, and Blood Institute’s and Boston University’s, The Framingham Heart Study, Framingham, MA, USA,School of Medicine, Boston University, Boston, MA, USA
| | - Benjamin D Horne
- Intermountain Medical Center Heart Institute, Salt Lake City, UT, USA,Division of Cardiovascular Medicine, Department of Medicine, Stanford University, Stanford, CA, USA
| | - Joseph B Muhlestein
- Intermountain Medical Center Heart Institute, Salt Lake City, UT, USA,Cardiology Division, Department of Internal Medicine, University of Utah, Salt Lake City, UT, USA
| | - Giovanni Benfari
- Department of Cardiovascular Medicine, Mayo Clinic, Rochester, MN, USA
| | | | - Andrea Natale
- Texas Cardiac Arrhythmia Institute, St David’s Medical Center, Austin, TX, USA
| | - Sanghamitra Mohanty
- Texas Cardiac Arrhythmia Institute, St David’s Medical Center, Austin, TX, USA
| | - Chintan Trivedi
- Texas Cardiac Arrhythmia Institute, St David’s Medical Center, Austin, TX, USA
| | - Moore B Shoemaker
- Department of Medicine, Division of Cardiovascular Diseases, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Zachary T Yoneda
- Department of Medicine, Division of Cardiovascular Diseases, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Quinn S Wells
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA,Department of Pharmacology, Vanderbilt University Medical Center, Nashville, TN, USA,Department of Biomedical Informatics, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Michael T Baker
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Eric Farber-Eger
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | | | - Alicia Lundby
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, København 2200, Denmark,The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, København 2200, Denmark
| | - Russell A Norris
- Cardiovascular Developmental Biology Center, Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC, USA
| | | | | | | | | | - Patrick T Ellinor
- Corresponding authors. Tel: +1 617 459 4688, (D.J.M.); Tel: +1 617 724 8729, (P.T.E.)
| | - David J Milan
- Corresponding authors. Tel: +1 617 459 4688, (D.J.M.); Tel: +1 617 724 8729, (P.T.E.)
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5
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Delwarde C, Aumond P, Toquet C, Lauzier B, Veziers J, Blandin S, Kayvanjoo A, Mass E, Remy S, Anegon I, Schott JJ, Le Tourneau T, Merot J, Capoulade R. Functional, structural and molecular characterization of a new mitral valve prolapse animal model: the FLNA-P637Q KI rat. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.1559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Introduction
Mitral Valve Prolapse (MVP) affects 3% of the population and is characterized by a heterogeneous mitral leaflet remodeling. The pathophysiological mechanisms involved in MVP development are not fully understood, the only therapeutic option remains the surgical valve replacement. We previously identified FLNA as the first gene causing MVP and recently generated a unique knock-in rat model for the FLNA-P637Q mutation that now paves the road to study the molecular mechanisms involved in MVP development.
Purpose
The aim of our study was to characterize the morphological, functional and molecular expression of the valvular disease in our unique KI rat model.
Methods
5 wild-type (WT) and 10 KI rats were evaluated at 3, 6 and 13 weeks. Comprehensive 2D echocardiography was performed to determine valve function and morphology. 3D quantitative analysis of the mitral valve (MV) remodelling was done using micro computed tomography (microCT). MV tissue composition was analysed based on histological and immunohistochemistry. Transcriptomic comparison was performed using RNA-sequencing approach.
Results
Based on the qualitative echocardiographic assessment of the valve, a high genotype-phenotype concordance was established for WT and KI animals (100%, 93% and 100% matching for each time points). The anterior leaflet was longer in KI comparatively to WT rats (+12 to +14% increase at all time points (p<0.01)). Increased lengths corroborated the increased leaflets volume assessed by microCT analysis (+20 to +58% in KI compared to WT all time points (p<0.05)). Histological and immunohistological analyses (leaflet's thickening, hypercellularity, proteoglycans accumulation without calcification) pointed out towards a myxomatous valve disease. The differential gene expression profile established by RNAseq analysis revealed that inflammation, epithelial cell migration or mechanical transduction pathways were specifically activated in KI valves. Genes such as Itgb2 (+1.30x), Ccl12 (+2.44x), Ccl2 (+1.79x), Ccl28 (+1.53x), Ccl7 (+2.95x), S100a8 (+8.40x) or S100a9 (+2.67x) were significantly upregulated in the GO:0060326 “cell chemotaxis”, p=2.31x10–5. In the GO:0043542 “endothelial cell migration”, p=1.59x10–6, Klf4 (+1.31x) and Tgfbr1 (+1.21x) were upregulated. Genes part of the GO:0048771 “tissue remodelling” (p=5.52x10–5) were also found upregulated.
Conclusion
These results establish that our unique KI FLNA-P637Q rat develops a myxomatous MV dystrophy comparable to the one described in MVP patients and thus constitutes a pertinent model to study the pathophysiological molecular mechanisms associated with MVP development. Our results point to molecular pathways including inflammation and epithelial activation, which constitute potential therapeutic targets.
Funding Acknowledgement
Type of funding sources: Public Institution(s). Main funding source(s): Connect Talent
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Affiliation(s)
- C Delwarde
- Institut du Thorax, Inserm UMR 1087, Nantes, France
| | - P Aumond
- Institut du Thorax, Inserm UMR 1087, Nantes, France
| | - C Toquet
- Université de Nantes, CHU Nantes, CNRS, INSERM, l'institut du thorax, Nantes, France
| | - B Lauzier
- Institut du Thorax, Inserm UMR 1087, Nantes, France
| | - J Veziers
- Regenerative Medicine and Skeleton, UMR 1229, Nantes, France
| | - S Blandin
- SFR-Santé, INSERM, CNRS, UNIV Nantes, CHU Nantes, Nantes, France
| | - A Kayvanjoo
- Life and Medical Sciences Institute, Bonn, Germany
| | - E Mass
- Life and Medical Sciences Institute, Bonn, Germany
| | - S Remy
- Centre de Recherche en Transplantation et Immunologie, UMR1064, Nantes, France
| | - I Anegon
- Centre de Recherche en Transplantation et Immunologie, UMR1064, Nantes, France
| | - J J Schott
- Institut du Thorax, Inserm UMR 1087, Nantes, France
| | - T Le Tourneau
- Université de Nantes, CHU Nantes, CNRS, INSERM, l'institut du thorax, Nantes, France
| | - J Merot
- Institut du Thorax, Inserm UMR 1087, Nantes, France
| | - R Capoulade
- Institut du Thorax, Inserm UMR 1087, Nantes, France
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6
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Ghidoni A, Elliott PM, Syrris P, Calkins H, James CA, Judge DP, Murray B, Barc J, Probst V, Schott JJ, Song JP, Hauer RNW, Hoorntje ET, van Tintelen JP, Schulze-Bahr E, Hamilton RM, Mittal K, Semsarian C, Behr ER, Ackerman MJ, Basso C, Parati G, Gentilini D, Kotta MC, Mayosi BM, Schwartz PJ, Crotti L. Cadherin 2-Related Arrhythmogenic Cardiomyopathy: Prevalence and Clinical Features. Circ Genom Precis Med 2021; 14:e003097. [PMID: 33566628 DOI: 10.1161/circgen.120.003097] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
BACKGROUND Arrhythmogenic cardiomyopathy (ACM) is an inherited cardiac disease characterized by fibrofatty replacement of the right and left ventricle, often causing ventricular dysfunction and life-threatening arrhythmias. Variants in desmosomal genes account for up to 60% of cases. Our objective was to establish the prevalence and clinical features of ACM stemming from pathogenic variants in the nondesmosomal cadherin 2 (CDH2), a novel genetic substrate of ACM. METHODS A cohort of 500 unrelated patients with a definite diagnosis of ACM and no disease-causing variants in the main ACM genes was assembled. Genetic screening of CDH2 was performed through next-generation or Sanger sequencing. Whenever possible, cascade screening was initiated in the families of CDH2-positive probands, and clinical evaluation was performed. RESULTS Genetic screening of CDH2 led to the identification of 7 rare variants: 5, identified in 6 probands, were classified as pathogenic or likely pathogenic. The previously established p.D407N pathogenic variant was detected in 2 additional probands. Probands and family members with pathogenic/likely pathogenic variants in CDH2 were clinically evaluated, and along with previously published cases, altogether contributed to the identification of gene-specific features (13 cases from this cohort and 11 previously published, for a total of 9 probands and 15 family members). Ventricular arrhythmic events occurred in most CDH2-positive subjects (20/24, 83%), while the occurrence of heart failure was rare (2/24, 8.3%). Among probands, sustained ventricular tachycardia and sudden cardiac death occurred in 5/9 (56%). CONCLUSIONS In this worldwide cohort of previously genotype-negative ACM patients, the prevalence of probands with CDH2 pathogenic/likely pathogenic variants was 1.2% (6/500). Our data show that this cohort of CDH2-ACM patients has a high incidence of ventricular arrhythmias, while evolution toward heart failure is rare.
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Affiliation(s)
- Alice Ghidoni
- Center for Cardiac Arrhythmias of Genetic Origin (A.G., M.-C.K., P.J.S., L.C.), Istituto Auxologico Italiano, IRCCS, Milan, Italy
| | - Perry M Elliott
- Center for Heart Muscle Disease, Institute of Cardiovascular Science, University College London, United Kingdom (P.M.E., P.S.)
| | - Petros Syrris
- Center for Heart Muscle Disease, Institute of Cardiovascular Science, University College London, United Kingdom (P.M.E., P.S.)
| | - Hugh Calkins
- Division of Cardiology, Department of Medicine, Johns Hopkins University, Baltimore, MD (H.C., C.A.J., B.M.)
| | - Cynthia A James
- Division of Cardiology, Department of Medicine, Johns Hopkins University, Baltimore, MD (H.C., C.A.J., B.M.)
| | - Daniel P Judge
- Medical University of South Carolina, Charleston, SC (D.P.J.)
| | - Brittney Murray
- Division of Cardiology, Department of Medicine, Johns Hopkins University, Baltimore, MD (H.C., C.A.J., B.M.)
| | - Julien Barc
- Université de Nantes (J.B.), CNRS, Inserm, l'Institut du Thorax, France
| | - Vincent Probst
- Université de Nantes, CHU Nantes (V.P., J.J.S.), CNRS, Inserm, l'Institut du Thorax, France.,Member of the European Reference Network for Rare, Low Prevalence and Complex Diseases of the Heart-ERN GUARD-Heart (V.P., E.S.-B., E.R.B., C.B., P.J.S., L.C.)
| | - Jean Jacques Schott
- Université de Nantes, CHU Nantes (V.P., J.J.S.), CNRS, Inserm, l'Institut du Thorax, France
| | - Jiang-Ping Song
- State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, China (J.-P.S.)
| | - Richard N W Hauer
- Netherlands Heart Institute (R.N.W.H., E.T.H., J.P.v.T.), University Medical Center Utrecht.,Department of Cardiology (R.N.W.H.), University Medical Center Utrecht
| | - Edgar T Hoorntje
- Netherlands Heart Institute (R.N.W.H., E.T.H., J.P.v.T.), University Medical Center Utrecht.,Department of Genetics, University Medical Center Groningen, University of Groningen, the Netherlands (E.T.H.)
| | - J Peter van Tintelen
- Netherlands Heart Institute (R.N.W.H., E.T.H., J.P.v.T.), University Medical Center Utrecht.,Department of Genetics (J.P.v.T.), University Medical Center Utrecht
| | - Eric Schulze-Bahr
- Member of the European Reference Network for Rare, Low Prevalence and Complex Diseases of the Heart-ERN GUARD-Heart (V.P., E.S.-B., E.R.B., C.B., P.J.S., L.C.).,Institute for Genetics of Heart Diseases (IfGH), University Hospital Münster, Germany (E.S.-B.)
| | | | - Kirti Mittal
- Hospital for Sick Children, Toronto, ON, Canada (R.M.H., K.M.)
| | - Christopher Semsarian
- Agnes Ginges Centre for Molecular Cardiology at Centenary Institute, The University of Sydney, NSW, Australia (C.S.)
| | - Elijah R Behr
- Member of the European Reference Network for Rare, Low Prevalence and Complex Diseases of the Heart-ERN GUARD-Heart (V.P., E.S.-B., E.R.B., C.B., P.J.S., L.C.).,Cardiology Clinical Academic Group, Institute of Molecular and Clinical Sciences, St George's University of London, St George's University Hospitals NHS Foundation Trust, London, United Kingdom (E.R.B.)
| | - Michael J Ackerman
- Departments of Cardiovascular Medicine (Division of Heart Rhythm Services, Windland Smith Rice Genetic Heart Rhythm Clinic), Pediatric and Adolescent Medicine (Division of Pediatric Cardiology), and Molecular Pharmacology and Experimental Therapeutics (Windland Smith Rice Sudden Death Genomics Laboratory), Mayo Clinic, Rochester, MN (M.J.A.)
| | - Cristina Basso
- Member of the European Reference Network for Rare, Low Prevalence and Complex Diseases of the Heart-ERN GUARD-Heart (V.P., E.S.-B., E.R.B., C.B., P.J.S., L.C.).,Cardiovascular Pathology Unit, Department of Cardiac, Thoracic and Vascular Sciences, University and Hospital of Padua, Italy (C.B.)
| | - Gianfranco Parati
- Istituto Auxologico Italiano, IRCCS, Cardiomyopathies Unit, Department of Cardiovascular, Neural and Metabolic Sciences, San Luca Hospital, Milan (G.P., L.C.).,Department of Medicine and Surgery, University of Milano-Bicocca, Milan, Italy (G.P., L.C.)
| | - Davide Gentilini
- Bioinformatics and Statistical Genomics Unit (D.G.), Istituto Auxologico Italiano, IRCCS, Milan, Italy.,Department of Brain and Behavioural Sciences, University of Pavia, Italy (D.G.)
| | - Maria-Christina Kotta
- Center for Cardiac Arrhythmias of Genetic Origin (A.G., M.-C.K., P.J.S., L.C.), Istituto Auxologico Italiano, IRCCS, Milan, Italy
| | - Bongani M Mayosi
- Department of Medicine, Hatter Institute for Cardiovascular Research in Africa, Groote Schuur Hospital and Division of Cardiology, Faculty of Health Sciences, University of Cape Town, South Africa (B.M.M.)
| | - Peter J Schwartz
- Center for Cardiac Arrhythmias of Genetic Origin (A.G., M.-C.K., P.J.S., L.C.), Istituto Auxologico Italiano, IRCCS, Milan, Italy.,Member of the European Reference Network for Rare, Low Prevalence and Complex Diseases of the Heart-ERN GUARD-Heart (V.P., E.S.-B., E.R.B., C.B., P.J.S., L.C.)
| | - Lia Crotti
- Center for Cardiac Arrhythmias of Genetic Origin (A.G., M.-C.K., P.J.S., L.C.), Istituto Auxologico Italiano, IRCCS, Milan, Italy.,Member of the European Reference Network for Rare, Low Prevalence and Complex Diseases of the Heart-ERN GUARD-Heart (V.P., E.S.-B., E.R.B., C.B., P.J.S., L.C.).,Istituto Auxologico Italiano, IRCCS, Cardiomyopathies Unit, Department of Cardiovascular, Neural and Metabolic Sciences, San Luca Hospital, Milan (G.P., L.C.).,Department of Medicine and Surgery, University of Milano-Bicocca, Milan, Italy (G.P., L.C.)
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7
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Perrot N, Thériault S, Rigade S, Chen HY, Dina C, Martinsson A, Boekholdt SM, Capoulade R, Le Tourneau T, Messika-Zeitoun D, Engert JC, Wareham NJ, Clavel MA, Pibarot P, Smith JG, Schott JJ, Mathieu P, Bossé Y, Thanassoulis G, Arsenault BJ. Lipoprotein-associated phospholipase A2 activity, genetics and calcific aortic valve stenosis in humans. Heart 2020; 106:1407-1412. [PMID: 32636298 DOI: 10.1136/heartjnl-2020-316722] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Revised: 05/18/2020] [Accepted: 05/26/2020] [Indexed: 11/03/2022] Open
Abstract
BACKGROUND Lipoprotein-associated phospholipase A2 (Lp-PLA2) activity has been shown to predict calcific aortic valve stenosis (CAVS) outcomes. Our objective was to test the association between plasma Lp-PLA2 activity and genetically elevated Lp-PLA2 mass/activity with CAVS in humans. METHODS AND RESULTS Lp-PLA2 activity was measured in 890 patients undergoing cardiac surgery, including 476 patients undergoing aortic valve replacement for CAVS and 414 control patients undergoing coronary artery bypass grafting. After multivariable adjustment, Lp-PLA2 activity was positively associated with the presence of CAVS (OR=1.21 (95% CI 1.04 to 1.41) per SD increment). We selected four single nucleotide polymorphisms (SNPs) at the PLA2G7 locus associated with either Lp-PLA2 mass or activity (rs7756935, rs1421368, rs1805017 and rs4498351). Genetic association studies were performed in eight cohorts: Quebec-CAVS (1009 cases/1017 controls), UK Biobank (1350 cases/349 043 controls), European Prospective Investigation into Cancer and Nutrition-Norfolk (504 cases/20 307 controls), Genetic Epidemiology Research on Aging (3469 cases/51 723 controls), Malmö Diet and Cancer Study (682 cases/5963 controls) and three French cohorts (3123 cases/6532 controls), totalling 10 137 CAVS cases and 434 585 controls. A fixed-effect meta-analysis using the inverse-variance weighted method revealed that none of the four SNPs was associated with CAVS (OR=0.99 (95% CI 0.96 to 1.02, p=0.55) for rs7756935, 0.97 (95% CI 0.93 to 1.01, p=0.11) for rs1421368, 1.00 (95% CI 1.00 to 1.01, p=0.29) for rs1805017, and 1.00 (95% CI 0.97 to 1.04, p=0.87) for rs4498351). CONCLUSIONS Higher Lp-PLA2 activity is significantly associated with the presence of CAVS and might represent a biomarker of CAVS in patients with heart disease. Results of our genetic association study suggest that Lp-PLA2 is however unlikely to represent a causal risk factor or therapeutic target for CAVS.
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Affiliation(s)
- Nicolas Perrot
- Centre de recherche de l'Institut universitaire de cardiologie et de pneumologie de Québec, Québec city, Québec, Canada.,Department of Medicine, Faculty of Medicine, Université Laval, Québec City, Québec, Canada
| | - Sébastien Thériault
- Centre de recherche de l'Institut universitaire de cardiologie et de pneumologie de Québec, Québec city, Québec, Canada.,Department of Molecular Biology, Medical Biochemistry and Pathology, Faculty of Medicine, Université Laval, Québec City, Québec, Canada
| | - Sidwell Rigade
- l'institut du thorax, INSERM, CNRS, UNIV Nantes, CHU Nantes, Nantes, France
| | - Hao Yu Chen
- McGill University Health Center Research Institute, Montreal, Quebec, Canada
| | - Christian Dina
- l'institut du thorax, INSERM, CNRS, UNIV Nantes, CHU Nantes, Nantes, France
| | - Andreas Martinsson
- Department of Cardiology, Clinical Sciences, Lund University, Lund, Sweden.,Department of Cardiology, Sahlgrenska universitetssjukhuset, Goteborg, Sweden
| | - S Matthijs Boekholdt
- Department of Cardiology, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | - Romain Capoulade
- l'institut du thorax, INSERM, CNRS, UNIV Nantes, CHU Nantes, Nantes, France
| | - Thierry Le Tourneau
- Ultrasound and Cardiology Departments, University Hospital, Institut du Thorax, Nantes, France
| | - David Messika-Zeitoun
- University of Ottawa Heart Institute, APHP, Bichat Hospital, Ottawa, Ontario, Canada
| | - James C Engert
- McGill University Health Center Research Institute, Montreal, Quebec, Canada
| | - Nicholas J Wareham
- Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK
| | - Marie-Annick Clavel
- Centre de recherche de l'Institut universitaire de cardiologie et de pneumologie de Québec, Québec city, Québec, Canada.,Department of Medicine, Faculty of Medicine, Université Laval, Québec City, Québec, Canada
| | - Philippe Pibarot
- Centre de recherche de l'Institut universitaire de cardiologie et de pneumologie de Québec, Québec city, Québec, Canada.,Department of Medicine, Faculty of Medicine, Université Laval, Québec City, Québec, Canada
| | - J Gustav Smith
- Department of Cardiology, Clinical Sciences, Lund University, Lund, Sweden.,Wallenberg Center for Molecular Medicine and Lund University Diabetes Center, Lund University, Lund, Sweden
| | | | - Patrick Mathieu
- Centre de recherche de l'Institut universitaire de cardiologie et de pneumologie de Québec, Québec city, Québec, Canada.,Department of Surgery, Faculty of Medicine, Université Laval, Québec City, Quebec, Canada
| | - Yohan Bossé
- Centre de recherche de l'Institut universitaire de cardiologie et de pneumologie de Québec, Québec city, Québec, Canada.,Department of Molecular Medicine, Faculty of Medicine, Université Laval, Québec City, Quebec, Canada
| | - George Thanassoulis
- McGill University Health Center Research Institute, Montreal, Quebec, Canada
| | - Benoit J Arsenault
- Centre de recherche de l'Institut universitaire de cardiologie et de pneumologie de Québec, Québec city, Québec, Canada .,Department of Medicine, Faculty of Medicine, Université Laval, Québec City, Québec, Canada
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8
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Le Tourneau T, Cueff C, Marrec M, Piriou N, Capoulade R, Le Scouarnec S, Merot J, Schott JJ. P756 Paradoxycal restricted motion in diastole associated to mitral valve prolapse/dystrophy: a frequent finding. Eur Heart J Cardiovasc Imaging 2020. [DOI: 10.1093/ehjci/jez319.419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Funding Acknowledgements
PHRCI mitral 2012
Background
Filamin-A mitral valve prolapse/dystrophy (FLNA-MVP) phenotype associates moderate MVP and a paradoxical restricted motion in diastole.
Purpose
We aimed to assess the association of MVP with restricted motion in diastole in MVP patients (restricted MVP).
Methods
We prospectively enrolled 433 MVP probands (57 ± 16 years). Patients underwent a clinical examination and a comprehensive echocardiographic analysis of mitral valve apparatus.
Results Among the 433 probands, 27 (6.2%, 95% CI 3.9-8.5) had both a MVP and a doming aspect in diastole. Patients with restricted MVP exhibited shorter posterior chordae tendinaes (24.8 ± 6.3 vs 27.2 ± 5.9 mm, P = 0.037), and a shorter distance between papillary muscle (PM) tips and mitral annulus (anterior PM: P = 0.0001; posterior PM: P = 0.009). Anterior mitral valve leaflet was lengthened (15.5 ± 2.4 vs 14.3 ± 2.6 mm/m², P = 0.018), but leaflet thickness, leaflet prolapse, and mitral valve annulus did not differ between the 2 groups. Bicuspid aortic valve was more frequent in patients with restricted phenotype (14.8 vs 2.9%, P < 0.05). Familial recurrence of restricted MVP was identified even in the absence of Filamin-A mutation.
Conclusion
Restricted MVP is a quite frequent finding in MVP patients and is associated with PM tips location closer to mitral annulus. Restricted MVP can be regarded as a third type of MVP beside myxomatous Barlow disease and fibro-elastic deficiency MVP.
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Affiliation(s)
| | - C Cueff
- Institut du Thorax, Inserm UMR 1087, Nantes, France
| | - M Marrec
- Institut du Thorax, Inserm UMR 1087, Nantes, France
| | - N Piriou
- Institut du Thorax, Inserm UMR 1087, Nantes, France
| | - R Capoulade
- Institut du Thorax, Inserm UMR 1087, Nantes, France
| | | | - J Merot
- Institut du Thorax, Inserm UMR 1087, Nantes, France
| | - J J Schott
- Institut du Thorax, Inserm UMR 1087, Nantes, France
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9
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Murata H, Lindenbaum P, Le Scouarnec S, Baron E, Rajalu A, Kyndt F, Deleuze JF, Le Marec H, Probst V, Shimizu W, Redon R, Schott JJ. P2864A novel mechanism of sinus node dysfunction: intergenic deletion between PITX2 and ANK2 disrupts chromatin structure in pacemaker cell differentiation. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz748.1173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Genetics of sinus node dysfunction (SND) remains poorly understood with few genes identified (HCN4, SCN5A, GJA5, KCNQ1, MYH6 and ANK2) and further genetic heterogeneity.
Purpose
We report two families with SND segregating with an intergenic deletion associated with long-range cis-regulatory elements (CREs) of PITX2.
Methods
We applied 30x whole genome sequencing (WGS) to two French families in which exome sequencing did not allow to detect the causing genes of SND and analyzed them bioinformatically.
Results
We first applied WGS to a 4-generation family presenting 16 patients with SND, atrial fibrillation and/or repolarization abnormalities and identified a 15-Kb deletion within a 16.5-cM linkage interval (Zmax = 5.9, θ = 0) on chromosome 4q25. We also applied WGS on a second family presenting 5 patients with SND and identified a 91-Kb deletion overlapping the initial deletion. This intergenic deletion, which was located between PITX2 and ANK2 and contained a binding motif of CCCTC-binding factor (CTCF), was segregating in all patients and was not found in 855 French control genomes. CTCF functions as a genome organizer mediating genomic interactions between genes and CREs. To clarify a possible regulatory function of the 1.5-Mb intergenic region containing the deletion, we interrogated 3 epigenetic databases. High-throughput chromosome conformation capture (Hi-C) (1) revealed that this intergenic region was placed in a topologically associating domain (TAD) containing PITX2. Chromatin interaction analysis by paired-end tag (ChIA-PET) of CTCF (2) suggested several possible functional chromatin loops in the TAD. Of them, a CTCF-mediated chromatin loop corresponding to a 300-Kb genomic region was clarified as a possible CRE using histone modification data from Roadmap. The region ranging between the intra-deletion CTCF motif and another distal motif was repressed in H3K27me3 profiles of fetal heart, while the region was activated in H3K27ac profiles of H1 ESC-derived mesendoderm.
Conclusion
This CRE may regulate expression of PITX2 and/or ANK2 in pacemaker cell differentiation. Ongoing experiments on patient's iPSC and transgenic mouse will further characterize the disease mechanism.
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Affiliation(s)
- H Murata
- Nippon Medical School, Department of Cardiovascular Medicine, Tokyo, Japan
| | - P Lindenbaum
- Research unit of l'Institut du thorax, Nantes, France
| | | | - E Baron
- Research unit of l'Institut du thorax, Nantes, France
| | - A Rajalu
- Research unit of l'Institut du thorax, Nantes, France
| | - F Kyndt
- Research unit of l'Institut du thorax, Nantes, France
| | - J F Deleuze
- Centre National de Recherche en Génomique Humaine, Paris, France
| | - H Le Marec
- Research unit of l'Institut du thorax, Nantes, France
| | - V Probst
- Research unit of l'Institut du thorax, Nantes, France
| | - W Shimizu
- Nippon Medical School, Department of Cardiovascular Medicine, Tokyo, Japan
| | - R Redon
- Research unit of l'Institut du thorax, Nantes, France
| | - J J Schott
- Research unit of l'Institut du thorax, Nantes, France
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10
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Le Tourneau T, Cueff C, Piriou N, Capoulade R, Le Scouarnec S, Merot J, Schott JJ. P6490Paradoxycal restricted motion in diastole is a frequent finding in mitral valve prolapse/dystrophy patients. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz746.1080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Filamin-A mitral valve prolapse/dystrophy (FLNA-MVP) phenotype associates MVP and a paradoxical restricted motion in diastole.
Purpose
We aim to assess the association of mitral valve prolapse to restricted motion in diastole in MVP patients (restricted MVP).
Methods
We prospectively enrolled 475 MVP probands (64±13 years) and controls relatives. Patients underwent a clinical examination and a comprehensive echocardiographic analysis of mitral valve apparatus.
Results
Among 475 consecutive probands, 48 (10.1%, 95% CI 7.7–13.3) had both a MVP and a doming aspect in diastole. Patients with restricted MVP exhibited shorted chordae tendinaes, and a shorter distance between papillary muscle tip and mitral annulus. Compared with controls, mitral valve leaflets were lenghtened, thickened and mitral valve annulus was enlarged. The prevalence of polyvalvular disease and bicuspid aortic valve was not increased in restricted MVP patients compared with conventional MVP. Familial form of restricted MVP was identified even in the absence of Filamin-A mutation.
Conclusion
Restricted MVP is a quite frequent finding in MVP patients and is associated with unique features of the MV apparatus. Restricted MVP can be regarded as a third type of MVP beside myxomatous Barlow disease and fibro-elastic deficiency MVP.
Acknowledgement/Funding
PHRC I Mitral, Fédération Française de Cardiologie, Fondation Coeur et recherche
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Affiliation(s)
| | - C Cueff
- Institut du Thorax, Inserm UMR 1087, Nantes, France
| | - N Piriou
- Institut du Thorax, Inserm UMR 1087, Nantes, France
| | - R Capoulade
- Institut du Thorax, Inserm UMR 1087, Nantes, France
| | | | - J Merot
- Institut du Thorax, Inserm UMR 1087, Nantes, France
| | - J J Schott
- Institut du Thorax, Inserm UMR 1087, Nantes, France
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11
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Capoulade R, Cueff C, Piriou N, Toquet C, Blandin S, Guimbretiere G, Omen T, Aalberts J, Bernstein D, Bernstein J, Trochu JN, Le Marec H, Merot J, Schott JJ, Le Tourneau T. P5441Aortic valve phenotype associated with filamin-A mutations: a comprehensive echocardiographic and outcomes analyses. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy566.p5441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- R Capoulade
- Research unit of l'Institut du thorax, Nantes, France
| | - C Cueff
- Research unit of l'Institut du thorax, Nantes, France
| | - N Piriou
- Research unit of l'Institut du thorax, Nantes, France
| | - C Toquet
- Research unit of l'Institut du thorax, Nantes, France
| | - S Blandin
- Research unit of l'Institut du thorax, Nantes, France
| | | | - T Omen
- Antonius Hospital, Sneek, Netherlands
| | - J Aalberts
- Congenital Heart Center UMCG, Groningen, Netherlands
| | - D Bernstein
- School of Medicine, Stanford, United States of America
| | - J Bernstein
- School of Medicine, Stanford, United States of America
| | - J N Trochu
- Research unit of l'Institut du thorax, Nantes, France
| | - H Le Marec
- Research unit of l'Institut du thorax, Nantes, France
| | - J Merot
- Research unit of l'Institut du thorax, Nantes, France
| | - J J Schott
- Research unit of l'Institut du thorax, Nantes, France
| | - T Le Tourneau
- Research unit of l'Institut du thorax, Nantes, France
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12
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Therasse D, Sacher F, Petit B, Babuty D, Mabo P, Martins R, Jesel L, Maury P, Pasquie JL, Mansourati J, Dupuis JM, Kyndt F, Thollet A, Guyomarch B, Barc J, Schott JJ, Le Marec H, Redon R, Probst V, Gourraud JB. Sodium-channel blocker challenge in the familial screening of Brugada syndrome: Safety and predictors of positivity. Heart Rhythm 2017; 14:1442-1448. [DOI: 10.1016/j.hrthm.2017.06.031] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Indexed: 10/19/2022]
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13
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Therasse D, Sacher F, Babuty D, Mabo P, Mansourati J, Kyndt F, Redon R, Schott JJ, Barc J, Probst V, Gourraud JB. Value of the sodium-channel blocker challenge in Brugada syndrome. Int J Cardiol 2017; 245:178-180. [PMID: 28784436 DOI: 10.1016/j.ijcard.2017.05.099] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/17/2017] [Revised: 05/29/2017] [Accepted: 05/31/2017] [Indexed: 12/19/2022]
Abstract
AIMS Intravenous drug challenge is frequently performed to unmask Brugada syndrome (BrS). However, its true sensitivity has never been assessed. We used the obligate BrS transmitters in families affected by BrS to evaluate the true accuracy of drug challenge. METHODS All consecutive patients from 2000 to 2014 who underwent drug challenge during familial screening for BrS were included in the study. Obligate BrS transmitters were defined as the presence of a descendant and non-descendant first-degree relative affected by BrS. Two physicians blinded to the clinical and genetic status reviewed the data. RESULTS Among 705 drug challenges performed in 149 families, 50 were performed in obligate transmitters from 42 different families. SCN5A mutations were identified in 20 families. Two obligate transmitters were not carrier of the familial mutation. Based on obligate transmitters, sensitivity was 100% for Ajmaline vs 77% for Flecainide (P=0.002). Based on the presence of the familial SCN5A mutation in all family relatives, sensitivity and specificity of sodium channel blocker challenge were respectively 78% (95/122) and 46% (68/148). During a median follow-up of 91 (26-136) months, 2 ventricular fibrillations occurred in obligate transmitters. CONCLUSION We demonstrated that Ajmaline challenge presents an excellent sensitivity that may rule out the diagnosis of BrS when negative. Conversely, a negative Flecainide challenge may not prevent from Brs inheritance and risk of SCD. This may lead to suggest systematic use of Ajmaline during drug challenge.
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Affiliation(s)
- Dylan Therasse
- CHU Nantes, L'institut du thorax, Service de Cardiologie, Nantes F-44000, France
| | - Frederic Sacher
- CHU Bordeaux, IHU LYRIC, Hôpital cardiologique, Bordeaux, France
| | | | | | | | - Florence Kyndt
- CHU Nantes, L'institut du thorax, Service de Cardiologie, Nantes F-44000, France; CHU Nantes, Service de Génétique Médicale, Nantes F-44000, France
| | - Richard Redon
- CHU Nantes, L'institut du thorax, Service de Cardiologie, Nantes F-44000, France; INSERM, CNRS, UNIV Nantes, L'institut du thorax, Nantes F-44000, France
| | - Jean Jacques Schott
- CHU Nantes, L'institut du thorax, Service de Cardiologie, Nantes F-44000, France; INSERM, CNRS, UNIV Nantes, L'institut du thorax, Nantes F-44000, France
| | - Julien Barc
- INSERM, CNRS, UNIV Nantes, L'institut du thorax, Nantes F-44000, France
| | - Vincent Probst
- CHU Nantes, L'institut du thorax, Service de Cardiologie, Nantes F-44000, France; INSERM, CNRS, UNIV Nantes, L'institut du thorax, Nantes F-44000, France
| | - Jean-Baptiste Gourraud
- CHU Nantes, L'institut du thorax, Service de Cardiologie, Nantes F-44000, France; INSERM, CNRS, UNIV Nantes, L'institut du thorax, Nantes F-44000, France.
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14
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Labbé P, Faure E, Lecointe S, Le Scouarnec S, Kyndt F, Marrec M, Le Tourneau T, Offmann B, Duplaà C, Zaffran S, Schott JJ, Merot J. The alternatively spliced LRRFIP1 Isoform-1 is a key regulator of the Wnt/β-catenin transcription pathway. Biochim Biophys Acta Mol Cell Res 2017; 1864:1142-1152. [PMID: 28322931 DOI: 10.1016/j.bbamcr.2017.03.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Revised: 03/15/2017] [Accepted: 03/17/2017] [Indexed: 01/22/2023]
Abstract
The GC-rich Binding Factor 2/Leucine Rich Repeat in the Flightless 1 Interaction Protein 1 gene (GCF2/LRRFIP1) is predicted to be alternatively spliced in five different isoforms. Although important peptide sequence differences are expected to result from this alternative splicing, to date, only the gene transcription regulator properties of LRRFIP1-Iso5 were unveiled. Based on molecular, cellular and biochemical data, we show here that the five isoforms define two molecular entities with different expression profiles in human tissues, subcellular localizations, oligomerization properties and transcription enhancer properties of the canonical Wnt pathway. We demonstrated that LRRFIP1-Iso3, -4 and -5, which share over 80% sequence identity, are primarily located in the cell cytoplasm and form homo and hetero-multimers between each other. In contrast, LRRFIP1-Iso1 and -2 are primarily located in the cell nucleus in part thanks to their shared C-terminal domain. Furthermore, we showed that LRRFIP1-Iso1 is preferentially expressed in the myocardium and skeletal muscle. Using the in vitro Topflash reporter assay we revealed that among LRRFIP1 isoforms, LRRFIP1-Iso1 is the strongest enhancer of the β-catenin Wnt canonical transcription pathway thanks to a specific N-terminal domain harboring two critical tryptophan residues (W76, 82). In addition, we showed that the Wnt enhancer properties of LRRFIP1-Iso1 depend on its homo-dimerisation which is governed by its specific coiled coil domain. Together our study identified LRRFIP1-Iso1 as a critical regulator of the Wnt canonical pathway with a potential role in myocyte differentiation and myogenesis.
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Affiliation(s)
- Pauline Labbé
- l'institut du thorax, INSERM, CNRS, UNIV Nantes, Nantes, France
| | - Emilie Faure
- Aix Marseille Univ, INSERM, GMGF, Marseille, France
| | | | | | | | | | | | | | - Cécile Duplaà
- INSERM, Biology of Cardiovascular Diseases, U1034, F-33600 Pessac, France
| | | | - Jean Jacques Schott
- l'institut du thorax, INSERM, CNRS, UNIV Nantes, Nantes, France; CHU Nantes, Nantes, France
| | - Jean Merot
- l'institut du thorax, INSERM, CNRS, UNIV Nantes, Nantes, France.
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15
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Huchet F, Kyndt F, Barc J, Thollet A, Charpentier F, Redon R, Schott JJ, le Marec H, Probst V, Gourraud JB. Familial Catecholamine-Induced QT Prolongation in Unexplained Sudden Cardiac Death. J Am Coll Cardiol 2017; 69:1642-1643. [DOI: 10.1016/j.jacc.2017.01.030] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Revised: 01/10/2017] [Accepted: 01/18/2017] [Indexed: 10/19/2022]
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16
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Clerc OF, Lima Da Silva G, Jobbe Duval A, Santoro C, Possner M, Liga R, Fuchs TA, Dougoud S, Stehli J, Vontobel J, Mikulicic F, Kaufmann PA, Gaemperli O, Almeida AMG, David C, Francisco AR, Guimaraes T, Placido R, Menezes M, Pinto FJ, Rimbert A, Cueff C, Lecointe S, Hagege AA, Levine R, Merot J, Le Marec H, Schott JJ, Le Tourneau T, Lembo M, Esposito R, Cocozza S, Ilardi F, Arpino G, De Placido S, De Simone G, Trimarco B, Galderisi M. Young Investigator Award session – Clinical Science442Left bundle branch block and coronary artery disease in coronary ct angiography443Focal myocardial fibrosis and abnormal left ventricular strain in patients with sarcoidosis without clinical evidence of cardiac disease444Arhgap24, a first gene for fibro elastic deficiency mitral valve prolapse? A phenotypic study445Advantage of using ASE/EACVI criteria for detection of subclinical cardiotoxicity in breast cancer patients undergoing anthracycline and trastuzumab therapy. Eur Heart J Cardiovasc Imaging 2015. [DOI: 10.1093/ehjci/jev257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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17
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Therasse D, Simonet F, Dina C, Thollet A, Mabo P, Sacher F, Babuty D, Maury P, Schott JJ, Le Marec H, Redon R, Probst V, Gourraud JB. 0210 : Effect of SCN5A mutations and SCN10A, SCN5A and HEY2 frequent variants on ECG of Brugada patients during ajmaline test. Archives of Cardiovascular Diseases Supplements 2015. [DOI: 10.1016/s1878-6480(15)30108-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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18
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Gourraud JB, Kyndt F, Fouchard S, Rendu E, Jaafar P, Gully C, Gacem K, Dupuis JM, Longueville A, Baron E, Karakachoff M, Cebron JP, Chatel S, Schott JJ, Le Marec H, Probst V. Identification of a strong genetic background for progressive cardiac conduction defect by epidemiological approach. Heart 2012; 98:1305-10. [DOI: 10.1136/heartjnl-2012-301872] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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19
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Kattygnarath D, Maugenre S, Neyroud N, Balse E, Ichai C, Denjoy I, Dilanian G, Martins RP, Fressart V, Berthet M, Schott JJ, Leenhardt A, Probst V, Le Marec H, Hainque B, Coulombe A, Hatem SN, Guicheney P. MOG1: a new susceptibility gene for Brugada syndrome. ACTA ACUST UNITED AC 2011; 4:261-8. [PMID: 21447824 DOI: 10.1161/circgenetics.110.959130] [Citation(s) in RCA: 108] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Brugada syndrome (BrS) is caused mainly by mutations in the SCN5A gene, which encodes the α-subunit of the cardiac sodium channel Na(v)1.5. However, ≈ 20% of probands have SCN5A mutations, suggesting the implication of other genes. MOG1 recently was described as a new partner of Na(v)1.5, playing a potential role in the regulation of its expression and trafficking. We investigated whether mutations in MOG1 could cause BrS. METHODS AND RESULTS MOG1 was screened by direct sequencing in patients with BrS and idiopathic ventricular fibrillation. A missense mutation p.Glu83Asp (E83D) was detected in a symptomatic female patient with a type-1 BrS ECG but not in 281 controls. Wild type (WT)- and mutant E83D-MOG1 were expressed in HEK Na(v)1.5 stable cells and studied using patch-clamp assays. Overexpression of WT-MOG1 alone doubled sodium current (I(Na)) density compared to control conditions (P<0.01). In contrast, overexpression of mutant E83D alone or E83D+WT failed to increase I(Na) (P<0.05), demonstrating the dominant-negative effect of the mutant. Microscopy revealed that Na(v)1.5 channels failed to properly traffic to the cell membrane in the presence of the mutant. Silencing endogenous MOG1 demonstrated a 54% decrease in I(Na) density. CONCLUSIONS Our results support the hypothesis that dominant-negative mutations in MOG1 can impair the trafficking of Na(v)1.5 to the membrane, leading to I(Na) reduction and clinical manifestation of BrS. Moreover, silencing MOG1 reduced I(Na), demonstrating that MOG1 is likely to be important in the surface expression of Na(v)1.5 channels. All together, our data support MOG1 as a new susceptibility gene for BrS.
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20
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Norris RA, Moreno-Rodriguez R, Wessels A, Merot J, Bruneval P, Chester AH, Yacoub MH, Hagège A, Slaugenhaupt SA, Aikawa E, Schott JJ, Lardeux A, Harris BS, Williams LK, Richards A, Levine RA, Markwald RR. Expression of the familial cardiac valvular dystrophy gene, filamin-A, during heart morphogenesis. Dev Dyn 2010; 239:2118-27. [PMID: 20549728 DOI: 10.1002/dvdy.22346] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Myxoid degeneration of the cardiac valves is a common feature in a heterogeneous group of disorders that includes Marfan syndrome and isolated valvular diseases. Mitral valve prolapse is the most common outcome of these and remains one of the most common indications for valvular surgery. While the etiology of the disease is unknown, recent genetic studies have demonstrated that an X-linked form of familial cardiac valvular dystrophy can be attributed to mutations in the Filamin-A gene. Since these inheritable mutations are present from conception, we hypothesize that filamin-A mutations present at the time of valve morphogenesis lead to dysfunction that progresses postnatally to clinically relevant disease. Therefore, by carefully evaluating genetic factors (such as filamin-A) that play a substantial role in MVP, we can elucidate relevant developmental pathways that contribute to its pathogenesis. In order to understand how developmental expression of a mutant protein can lead to valve disease, the spatio-temporal distribution of filamin-A during cardiac morphogenesis must first be characterized. Although previously thought of as a ubiquitously expressed gene, we demonstrate that filamin-A is robustly expressed in non-myocyte cells throughout cardiac morphogenesis including epicardial and endocardial cells, and mesenchymal cells derived by EMT from these two epithelia, as well as mesenchyme of neural crest origin. In postnatal hearts, expression of filamin-A is significantly decreased in the atrioventricular and outflow tract valve leaflets and their suspensory apparatus. Characterization of the temporal and spatial expression pattern of filamin-A during cardiac morphogenesis is a crucial first step in our understanding of how mutations in filamin-A result in clinically relevant valve disease.
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Affiliation(s)
- R A Norris
- Cardiovascular Developmental Biology Center, Department of Regenerative Medicine and Cell Biology, Children's Research Institute, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, USA.
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21
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Haïssaguerre M, Chatel S, Sacher F, Weerasooriya R, Probst V, Loussouarn G, Horlitz M, Liersch R, Schulze-Bahr E, Wilde A, Kääb S, Koster J, Rudy Y, Le Marec H, Schott JJ. Ventricular fibrillation with prominent early repolarization associated with a rare variant of KCNJ8/KATP channel. J Cardiovasc Electrophysiol 2009; 20:93-8. [PMID: 19120683 DOI: 10.1111/j.1540-8167.2008.01326.x] [Citation(s) in RCA: 243] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
BACKGROUND Early repolarization in the inferolateral leads has been recently recognized as a frequent syndrome associated with idiopathic ventricular fibrillation (VF). We report the case of a patient presenting dramatic changes in the ECG in association with recurrent VF in whom a novel genetic variant has been identified. CASE REPORT This young female (14 years) was resuscitated in 2001 following an episode of sudden death due to VF. All examinations including coronary angiogram with ergonovine injection, MRI, and flecainide or isoproterenol infusion were normal. The patient had multiple (>100) recurrences of VF unresponsive to beta-blockers, lidocaine/mexiletine, verapamil, and amiodarone. Recurrences of VF were associated with massive accentuation of the early repolarization pattern at times mimicking acute myocardial ischemia. Coronary angiography during an episode with 1.2 mV J/ST elevation was normal. Isoproterenol infusion acutely suppressed electrical storms, while quinidine eliminated all recurrences of VF and restored a normal ECG over a follow-up of 65 months. Genomic DNA sequencing of K(ATP) channel genes showed missense variant in exon 3 (NC_000012) of the KCNJ8 gene, a subunit of the K(ATP) channel, conferring predisposition to dramatic repolarization changes and ventricular vulnerability.
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22
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Abstract
The pathophysiology of primary Raynaud's phenomenon (Raynaud's disease) remains uncertain but the transmission of this primary microcirculatory dysregulation seems strongly influenced by genetic factors. For a long time, physicians have found that the hereditary factor plays an important role in the genesis of Raynaud's disease. Familial analysis and twin studies have confirmed the role of an hereditary factor. It seems heterogeneous but pedigree analysis indicates the possibility of an autosomal dominant transmission influenced by sex, in some families, allowing an approach called "reverse genetic" based on linkage analysis. Such an approach has focused on few loci but sequencing of candidate genes for genetic mutations remains negative. Given the supposed heterogeneity of the genetic transmission of Raynaud's disease, diversification of strategies in molecular genetics is suitable with reference to techniques applied to multifactorial heredity.
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Affiliation(s)
- M A Pistorius
- Service de Médecine Interne et Vasculaire, CHU Hôtel-Dieu, Place Alexis Ricordeau, 44000 Nantes
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23
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Probst V, Kyndt F, Allouis M, Schott JJ, Le Marec H. [Genetics and cardiac arrhythmias]. Arch Mal Coeur Vaiss 2003; 96:1054-62. [PMID: 14694781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/27/2023]
Abstract
The identification of the first gene locus of hereditary arrhythmias was made over 10 years ago. In the last few years, considerable progress has been made and the number of culprit genes for cardiac arrhythmias has rapidly increased. This has been the fruit of close collaboration between clinicians, geneticists and physiologists. This work has demonstrated the heterogenous nature of genetics of diseases. It has led to a better understanding of underlying physiopathological mechanisms by the study of the relationship between gene and clinical abnormalities. In addition, analysis of phenotypes and genotypes has improved our knowledge of the clinical presentation of diseases and opened up new therapeutic approaches. These new diagnostic methods have enabled preventive measures to be taken to avoid potentially serious arrhythmias. The genetics of cardiac arrhythmias is still in its infancy: many culprit genes remain undetected and their identification should led to considerable progress in the understanding of the physiopathology of arrhythmias and their treatment.
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Affiliation(s)
- V Probst
- Service de cardiologie du CHU de Nantes, hôpital G. & R. Laennec et INSERM U533, boulevard Jacques Monod, 44093 Nantes
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24
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Probst V, Kyndt F, Allouis M, Schott JJ, Le Marec H. [Genetic aspects of cardiac conduction defects]. Arch Mal Coeur Vaiss 2003; 96:1067-73. [PMID: 14694782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/27/2023]
Abstract
Degenerative conduction defects are usually considered to be exaggerated ageing affecting the conduction pathways. For several years familial forms have been described, and a first locus on chromosome 19 and then a first gene, SCN5A on chromosome 3 (coding for the sodium channel alpha subunit), have been identified. Mutations of this gene can lead not only to congenital conduction defects but also to progressive forms of conduction defects similar to Lenègre disease. A third locus on chromosome 16 at 16q23-24 has been identified, as have other families not linked to the loci described previously. Although it now seems clear that conduction defects can have a genetic component, the frequency of the familial forms remains to be determined. Important progress could be made in the understanding of this disease if other implicated genes were identified. It would then become possible to elucidate the different pathophysiological mechanisms responsible for conduction defects.
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Affiliation(s)
- V Probst
- Service de cardiologie du CHU de Nantes, boulevard Jacques Monod, 44093 Nantes
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25
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Smits JPP, Eckardt L, Probst V, Bezzina CR, Schott JJ, Remme CA, Haverkamp W, Breithardt G, Escande D, Schulze-Bahr E, LeMarec H, Wilde AAM. Genotype-phenotype relationship in Brugada syndrome: electrocardiographic features differentiate SCN5A-related patients from non-SCN5A-related patients. J Am Coll Cardiol 2002; 40:350-6. [PMID: 12106943 DOI: 10.1016/s0735-1097(02)01962-9] [Citation(s) in RCA: 243] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
OBJECTIVES We have tested whether a genotype-phenotype relationship exists in Brugada syndrome (BS) by trying to distinguish BS patients with (carriers) and those without (non-carriers) a mutation in the gene encoding the cardiac sodium channel (SCN5A) using clinical parameters. BACKGROUND Brugada syndrome is an inherited cardiac disease characterized by a varying degree of ST-segment elevation in the right precordial leads and (non)specific conduction disorders. In a minority of patients, SCN5A mutations can be found. Genetic heterogeneity has been demonstrated, but other causally related genes await identification. If a genotype-phenotype relationship exists, this might facilitate screening. METHODS In a multi-center study, we have collected data on demographics, clinical history, family history, electrocardiogram (ECG) parameters, His to ventricle interval (HV), and ECG parameters after pharmacologic challenge with I(Na) blocking drugs for BS patients with (n = 23), or those without (n = 54), an identified SCN5A mutation. RESULTS No differences were found in demographics, clinical history, or family history. Carriers had a significantly longer PQ interval on the baseline ECG and a significantly longer HV time. A PQ interval of > or =210 ms and an HV interval > or =60 ms seem to be predictive for the presence of an SCN5A mutation. After I(Na) blocking drugs, carriers had significantly longer PQ and QRS intervals and more increase in QRS duration. CONCLUSIONS We observed significantly longer conduction intervals on baseline ECG in patients with established SCN5A mutations (PQ and HV interval and, upon class I drugs, more QRS increase). These results concur with the observed loss of function of mutated BS-related sodium channels. Brugada syndrome patients with, and those without, an SCN5A mutation can be differentiated by phenotypical differences.
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Affiliation(s)
- Jeroen P P Smits
- Experimental and Molecular Cardiology Group, Academic Medical Center, University of Amsterdam, 1100 DE Amsterdam, The Netherlands
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26
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Le Caignec C, Lefevre M, Schott JJ, Chaventre A, Gayet M, Calais C, Moisan JP. Familial deafness, congenital heart defects, and posterior embryotoxon caused by cysteine substitution in the first epidermal-growth-factor-like domain of jagged 1. Am J Hum Genet 2002; 71:180-6. [PMID: 12022040 PMCID: PMC384977 DOI: 10.1086/341327] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2002] [Accepted: 04/15/2002] [Indexed: 12/15/2022] Open
Abstract
In the present study, we report a kindred with hearing loss, congenital heart defects, and posterior embryotoxon, segregating as autosomal dominant traits. Six of seven available affected patients manifested mild-to-severe combined hearing loss, predominantly affecting middle frequencies. Two patients were diagnosed with vestibular pathology. All patients had congenital heart defects, including tetralogy of Fallot, ventricular septal defect, or isolated peripheral pulmonic stenosis. No individual in this family met diagnostic criteria for any previously described clinical syndrome. A candidate-gene approach was undertaken and culminated in the identification of a novel Jagged 1 (JAG1) missense mutation (C234Y) in the first cysteine of the first epidermal-growth-factor-like repeat domain of the protein. JAG1 is a cell-surface ligand in the Notch signaling pathway. Mutations in JAG1 have been identified in patients with Alagille syndrome. Our findings revealed a unique phenotype with highly penetrant deafness, posterior embryotoxon, and congenital heart defects but with variable expressivity in a large kindred, which demonstrates that mutation in JAG1 can cause hearing loss.
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Affiliation(s)
- C Le Caignec
- Laboratoire d'Etude du Polymorphisme de l'ADN, Faculté de Médecine, Nantes, France.
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27
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Kyndt F, Probst V, Potet F, Demolombe S, Chevallier JC, Baro I, Moisan JP, Boisseau P, Schott JJ, Escande D, Le Marec H. Novel SCN5A mutation leading either to isolated cardiac conduction defect or Brugada syndrome in a large French family. Circulation 2001; 104:3081-6. [PMID: 11748104 DOI: 10.1161/hc5001.100834] [Citation(s) in RCA: 264] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND The SCN5A gene encoding the human cardiac sodium channel alpha subunit plays a key role in cardiac electrophysiology. Mutations in SCN5A lead to a large spectrum of phenotypes, including long-QT syndrome, Brugada syndrome, and isolated progressive cardiac conduction defect (Lenègre disease). METHODS AND RESULTS In the present study, we report the identification of a novel single SCN5A missense mutation causing either Brugada syndrome or an isolated cardiac conduction defect in the same family. A G-to-T mutation at position 4372 was identified by direct sequencing and was predicted to change a glycine for an arginine (G1406R) between the DIII-S5 and DIII-S6 domain of the sodium channel protein. Among 45 family members, 13 were carrying the G1406R SCN5A mutation. Four individuals from 2 family collateral branches showed typical Brugada phenotypes, including ST-segment elevation in the right precordial leads and right bundle branch block. One symptomatic patient with the Brugada phenotype required implantation of a cardioverter-defibrillator. Seven individuals from 3 other family collateral branches had isolated cardiac conduction defects but no Brugada phenotype. Three flecainide test were negative. One patient with an isolated cardiac conduction defect had an episode of syncope and required pacemaker implantation. An expression study of the G1406R-mutated SCN5A showed no detectable Na(+) current but normal protein trafficking. CONCLUSIONS We conclude that the same mutation in the SCN5A gene can lead either to Brugada syndrome or to an isolated cardiac conduction defect. Our findings suggest that modifier gene(s) may influence the phenotypic consequences of a SCN5A mutation.
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Affiliation(s)
- F Kyndt
- Laboratoire de Physiopathologie et de Pharmacologie Cellulaires et Moléculaires, INSERM U533, Paris, France
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28
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Chevalier P, Rodriguez C, Bontemps L, Miquel M, Kirkorian G, Rousson R, Potet F, Schott JJ, Baró I, Touboul P. Non-invasive testing of acquired long QT syndrome: evidence for multiple arrhythmogenic substrates. Cardiovasc Res 2001; 50:386-98. [PMID: 11334843 DOI: 10.1016/s0008-6363(01)00263-2] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND Although well-defined clinically and electrocardiographically, Acquired Long QT Syndrome (LQTS) remains elusive from a pathophysiologic point of view. An increasingly accepted hypothesis is that it represents an attenuated form of Congenital Long QT Syndrome. To test this hypothesis further, we investigated patients with Acquired LQTS, using various investigations that are known to give information in patients with Congenital LQTS. METHODS All the investigations were performed in patients with a history of Acquired Long QT Syndrome, defined by marked transient QT lengthening (QT>600 ms) and/or torsades de pointes. Measurement of the QT interval dispersion, the interlead difference for the QT interval on a 12-lead ECG, was performed in 18 patients and compared with 18 controls, matched for age and sex. To assess sympathetic myocardial innervation, I-123 Meta-iodobenzylguanidine (I-123-MIBG) scintigraphy was performed in 12 patients, together with Thallium scintigraphy, to rule out abnormal myocardial perfusion. Time-frequency analysis of a high-resolution ECG using a wavelet technique, was made for nine patients and compared with 38 healthy controls. Finally, genetic studies were performed prospectively in 16 consecutive patients, to look for HERG, KCNE1, KCNE2 and KCNQ1 mutations. The functional profile of a mutated HERG protein was performed using the patch-clamp technique. RESULTS Compared with the control group, a significant increase in QT dispersion was observed in the patients with a history of Acquired LQTS (55+/-15 vs. 33+/-9 ms, P<0.001). In another group of patients with Acquired LQTS, 123 I-MIBG tomoscintigraphy demonstrated a decrease in the sympathetic myocardial innervation. Time--frequency analysis using wavelet transform, demonstrated an abnormal frequency content within the QRS complexes, in the patients with Acquired LQTS, similar to that found in Congenital LQTS patients. Molecular screening in 16 consecutive patients, identified one patient with a missense mutation on HERG, one of the LQTS genes. Expression of the mutated HERG protein led to altered K(+) channel function. CONCLUSION Our results suggest that Acquired and Congenital Long QT Syndromes have some common features. They allow the mechanism of the clinical heterogeneity, found in both syndromes, to be understood. Further multi-facet approaches are needed to decipher the complex interplay between the main determinants of these arrhythmogenic diseases.
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Affiliation(s)
- P Chevalier
- Département de Cardiologie et de Soins Intensifs, Hôpital Louis Pradel, Lyon, France
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29
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Kasahara H, Lee B, Schott JJ, Benson DW, Seidman JG, Seidman CE, Izumo S. Loss of function and inhibitory effects of human CSX/NKX2.5 homeoprotein mutations associated with congenital heart disease. J Clin Invest 2000; 106:299-308. [PMID: 10903346 PMCID: PMC314312 DOI: 10.1172/jci9860] [Citation(s) in RCA: 126] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2000] [Accepted: 06/12/2000] [Indexed: 11/17/2022] Open
Abstract
CSX/NKX2.5 is an evolutionarily conserved homeodomain-containing (HD-containing) transcription factor that is essential for early cardiac development. Recently, ten different heterozygous CSX/NKX2.5 mutations were found in patients with congenital heart defects that are transmitted in an autosomal dominant fashion. To determine the consequence of these mutations, we analyzed nuclear localization, DNA binding, transcriptional activation, and dimerization of mutant CSX/NKX2.5 proteins. All mutant proteins were translated and located to the nucleus, except one splice-donor site mutant whose protein did not accumulate in the cell. All mutants that had truncation or missense mutations in the HD had severely reduced DNA binding activity and little or no transcriptional activation function. In contrast, mutants with intact HDs exhibit normal DNA binding to the monomeric binding site but had three- to ninefold reduction in DNA binding to the dimeric binding sites. HD missense mutations that preserved homodimerization ability inhibited the activation of atrial natriuretic factor by wild-type CSX/NKX2.5. Although our studies do not characterize the genotype-phenotype relationship of the ten human mutations, they identify specific abnormalities of CSX/NKX2.5 function essential for transactivation of target genes.
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Affiliation(s)
- H Kasahara
- Cardiovascular Division, Beth Israel Deaconess Medical Center, Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
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Trochu JN, Kyndt F, Schott JJ, Gueffet JP, Probst V, Bénichou B, Le Marec H. Clinical characteristics of a familial inherited myxomatous valvular dystrophy mapped to Xq28. J Am Coll Cardiol 2000; 35:1890-7. [PMID: 10841240 DOI: 10.1016/s0735-1097(00)00617-3] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
OBJECTIVES The purpose of this study was to describe the phenotypic characteristics of an inherited myxomatous valvular dystrophy mapped to Xq28. BACKGROUND Myxomatous valve dystrophies are a frequent cause of valvular diseases, the most common being idiopathic mitral valve prolapse. They form a group of heterogeneous diseases difficult to subclassify. The first mapping of the gene for a myxoid valvular dystrophy to Xq28 allowed investigation of the phenotype of affected members in a large family and characterization of the disease. METHODS Among the 318 members in the pedigree, 89 agreed to participate in this study. Phenotypic characteristics were investigated using clinical examination, transthoracic echocardiography and biological analysis (F.VIII activity). Genetic status was based on haplotype analysis. RESULTS Among 46 males, 9 were hemizygous to the mutant allele and had an obvious mitral and/or aortic myxomatous valve defect, and 4 had undergone valvular surgery. All had typical mitral valve prolapse associated in six cases with moderate to severe aortic regurgitation. The valve defect cosegregated with mild hemophilia A (F.VIII activity = 0.32 +/- 0.05). The 37 remaining males had normal valves and normal F.VIII activity. Heterozygous women were identified on the basis of their haplotypes. Among the 17 women heterozygous to the mutant allele, moderate mitral regurgitation was present in 8, associated with mild mitral valve prolapse in 1 and aortic regurgitation in 3, whereas 2 women had isolated mild aortic regurgitant murmur. In heterozygotes, the penetrance value was 0.60 but increased with age. CONCLUSION X-linked myxomatous valvular disease is characterized by mitral valve dystrophy frequently associated with degeneration of the aortic valves affecting males and, to a lower severity, females. The first localization of a gene for myxomatous valvular diseases is the first step for the subclassification of these diseases.
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Affiliation(s)
- J N Trochu
- Clinique Cardiologique et des Maladies Vasculaires, Hôpital G&R Laennec, CHU de Nantes, France
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31
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Bruneau BG, Bao ZZ, Tanaka M, Schott JJ, Izumo S, Cepko CL, Seidman JG, Seidman CE. Cardiac expression of the ventricle-specific homeobox gene Irx4 is modulated by Nkx2-5 and dHand. Dev Biol 2000; 217:266-77. [PMID: 10625552 DOI: 10.1006/dbio.1999.9548] [Citation(s) in RCA: 145] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We report the isolation and characterization of the cDNAs encoded by the murine and human homeobox genes, Irx4 (Iroquois homeobox gene 4). Mouse and human Irx4 proteins are highly conserved (83%) and their 63-aa homeodomain is more than 93% identical to that of the Drosophila Iroquois patterning genes. Human IRX4 maps to chromosome 5p15.3, which is syntenic to murine chromosome 13. Irx4 transcripts are present in the developing central nervous system, skin, and vibrissae, but are predominantly expressed in the cardiac ventricles. In mice at embryonic day (E) 7.5, Irx4 transcripts are found in the chorion and at low levels in a discrete anterior domain of the cardiac primordia. During the formation of the linear heart tube and its subsequent looping (E8.0-8.5), Irx4 expression is restricted to the ventricular segment and is absent from both the posterior (eventual atrial) and the anterior (eventual outflow tract) segments of the heart. Throughout all subsequent stages in which the chambers of the heart become morphologically distinct (E8.5-11) and into adulthood, cardiac Irx4 expression is found exclusively in the ventricular myocardium. Irx4 gene expression was also assessed in embryos with aberrant cardiac development: mice lacking RXRalpha or MEF2c have normal Irx4 expression, but mice lacking the homeobox transcription factor Nkx2-5 (Csx) have markedly reduced levels of Irx4 transcripts. dHand-null embryos initiate Irx4 expression, but cannot maintain normal levels. These data indicate that the homeobox gene Irx4 is likely to be an important mediator of ventricular differentiation during cardiac development, which is downstream of Nkx2-5 and dHand.
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Affiliation(s)
- B G Bruneau
- Department of Genetics, Harvard Medical School, Boston, Massachusetts, 02115, USA
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32
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Schott JJ, Alshinawi C, Kyndt F, Probst V, Hoorntje TM, Hulsbeek M, Wilde AA, Escande D, Mannens MM, Le Marec H. Cardiac conduction defects associate with mutations in SCN5A. Nat Genet 1999; 23:20-1. [PMID: 10471492 DOI: 10.1038/12618] [Citation(s) in RCA: 386] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- J J Schott
- Laboratoire de Physiopathologie et de Pharmacologie Cellulaires et Moléculaires, INSERM CJF96-01, France
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33
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Schott JJ, Benson DW, Basson CT, Pease W, Silberbach GM, Moak JP, Maron BJ, Seidman CE, Seidman JG. Congenital heart disease caused by mutations in the transcription factor NKX2-5. Science 1998; 281:108-11. [PMID: 9651244 DOI: 10.1126/science.281.5373.108] [Citation(s) in RCA: 872] [Impact Index Per Article: 33.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Mutations in the gene encoding the homeobox transcription factor NKX2-5 were found to cause nonsyndromic, human congenital heart disease. A dominant disease locus associated with cardiac malformations and atrioventricular conduction abnormalities was mapped to chromosome 5q35, where NKX2-5, a Drosophila tinman homolog, is located. Three different NKX2-5 mutations were identified. Two are predicted to impair binding of NKX2-5 to target DNA, resulting in haploinsufficiency, and a third potentially augments target-DNA binding. These data indicate that NKX2-5 is important for regulation of septation during cardiac morphogenesis and for maturation and maintenance of atrioventricular node function throughout life.
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Affiliation(s)
- J J Schott
- Department of Genetics and Howard Hughes Medical Institute, Harvard Medical School, Boston, MA 02115, USA
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34
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Lubianca Neto JF, Lu L, Eavey RD, Flores MA, Caldera RM, Sangwatanaroj S, Schott JJ, McDonough B, Santos JI, Seidman CE, Seidman JG. The Bjornstad syndrome (sensorineural hearing loss and pili torti) disease gene maps to chromosome 2q34-36. Am J Hum Genet 1998; 62:1107-12. [PMID: 9545407 PMCID: PMC1377094 DOI: 10.1086/301837] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
We report that the Bjornstad syndrome gene maps to chromosome 2q34-36. The clinical association of sensorineural hearing loss with pili torti (broken, twisted hairs) was described >30 years ago by Bjornstad; subsequently, several small families have been studied. We evaluated a large kindred with Bjornstad syndrome in which eight members inherited pili torti and prelingual sensorineural hearing loss as autosomal recessive traits. A genomewide search using polymorphic loci demonstrated linkage between the disease gene segregating in this kindred and D2S434 (maximum two-point LOD score = 4.98 at theta = 0). Haplotype analysis of recombination events located the disease gene in a 3-cM region between loci D2S1371 and D2S163. We speculate that intermediate filament and intermediate filament-associated proteins are good candidate genes for causing Bjornstad syndrome.
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Affiliation(s)
- J F Lubianca Neto
- Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA 02115, USA
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35
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Kyndt F, Schott JJ, Trochu JN, Baranger F, Herbert O, Scott V, Fressinaud E, David A, Moisan JP, Bouhour JB, Le Marec H, Bénichou B. Mapping of X-linked myxomatous valvular dystrophy to chromosome Xq28. Am J Hum Genet 1998; 62:627-32. [PMID: 9497244 PMCID: PMC1376942 DOI: 10.1086/301747] [Citation(s) in RCA: 65] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
Myxoid heart disease is frequently encountered in the general population. It corresponds to an etiologically heterogeneous group of diseases, idiopathic mitral valve prolapse (IMVP) being the most common form. A rarely observed form of myxoid heart disease, X-linked myxomatous valvular dystrophy (XMVD), is inherited in an X-linked fashion and is characterized by multivalvular myxomatous degeneration; however, the histopathological features of the mitral valve do not differ significantly from the severe form of IMVP. In this article, we describe the genetic analysis of a large family in which XMVD is associated with a mild hemophilia A. The coagulation factor VIII gene position in Xq28 provided a starting point for the genetic study, which was conducted by use of polymorphic markers. Two-point linkage analysis confirmed this localization, and a maximum LOD score of 6.57 was found at straight theta=0 for two polymorphic microsatellite markers, INT-3 and DXS1008, the first one being intronic to the factor VIII gene. Haplotype analysis of this chromosomal region allowed the definition of an 8-cM minimal interval containing the gene for XMVD, between DXS8011 and Xqter.
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Affiliation(s)
- F Kyndt
- Institut Nationale Santé Etude et Recherche Medical, Nantes, France
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Le Marec H, Schott JJ. [Congenital long QT syndromes]. Arch Mal Coeur Vaiss 1997; 90 Spec No 3:25-35. [PMID: 9295920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Molecular genetic studies have transformed our understanding of the congenital long QT syndromes. Previously, the phenotypes of the Jervell and Lange-Nielsen and Romano-Ward syndromes were characterised by prolongation of the QTc interval greater than 0.44 seconds on the ECG and by syncope or sudden death favorised by stress, the two syndromes being differentiated one from the other by their modes of transmission, recessive or dominant, and by the presence or absence of deafness. Close collaboration between physicians, geneticians and physiologists and the use of inverse genetic techniques led to the localisation of four genes on chromosomes 11, 7, 3 and 4 to the identification of three genes coding for potassium (HERG and KVLQT1) and sodium (SCN5A) channels. These advances have not only improved our understanding of the physiopathology of these syndromes but also our phenotype criteria whilst demonstrating the complexity of clinical diagnosis. They open up new perspectives for the management of patients with these syndromes.
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Affiliation(s)
- H Le Marec
- Clinique cardiologique et des maladies vasculaires, hôpital G. & R. Laennec, CHU de Nantas
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37
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Le Marec H, Schott JJ. [Hereditary cardiac arrhythmia]. Arch Mal Coeur Vaiss 1997; 90 Spec No 1:57-66. [PMID: 9238458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Progress in molecular biology has advanced our medical knowledge. The identification of genetic abnormalities has been transformed into the new approach of "inverse genetic s" which is based on close collaboration between clinicians, geneticians, molecular biologists and physiologists. In monogenic affections of unknown mechanism, the scientific method of determining the culprit gene is based essentially on precise phenotypic identification of all members of a large family and on DNA studies. The following steps consist in localising the gene with polymorphic genetic probes and then demonstrate the causal mutations and, finally, reexpress the normal and abnormal genes to study their function and thereby confirm the mutation. This approach has recently been applied to cardiac arrhythmias. Genes responsible for atrioventricular conduction defects, Wolff-Parkinson-White syndromes associated with hypertrophic cardiomyopathy and arrhythmogenic right ventricular dysplasia have been localised in the human genome showing that these syndromes are often very variable. The greatest progress has been achieved in the congenital long QT syndrome. Four genes have been localised on chromosomes 3, 1, 7 and 11, and three have already been identified which has allowed study of their function and genotype-phenotype analysis.
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MESH Headings
- Arrhythmias, Cardiac/genetics
- Arrhythmias, Cardiac/physiopathology
- Chromosome Mapping
- Chromosomes, Human, Pair 1/genetics
- Chromosomes, Human, Pair 11/genetics
- Chromosomes, Human, Pair 3/genetics
- Chromosomes, Human, Pair 7/genetics
- Crossing Over, Genetic
- Genetic Linkage
- Genotype
- Humans
- Lod Score
- Long QT Syndrome/genetics
- Long QT Syndrome/physiopathology
- Phenotype
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Affiliation(s)
- H Le Marec
- Clinique cardiologique et des maladies vasculaires, CJF INSERM 96-01, hôpital G. et R. Laennec, Nantes
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38
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Pravenec M, Gauguier D, Schott JJ, Buard J, Kren V, Bílá V, Szpirer C, Szpirer J, Wang JM, Huang H, St Lezin E, Spence MA, Flodman P, Printz M, Lathrop GM, Vergnaud G, Kurtz TW. A genetic linkage map of the rat derived from recombinant inbred strains. Mamm Genome 1996; 7:117-27. [PMID: 8835528 DOI: 10.1007/s003359900031] [Citation(s) in RCA: 82] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
We have constructed a genetic linkage map in the rat by analyzing the strain distribution patterns of 500 genetic markers in a large set of recombinant inbred strains derived from the spontaneously hypertensive rat and the Brown-Norway rat (HXB and BXH recombinant inbred strains). 454 of the markers could be assigned to specific chromosomes, and the amount of genome covered by the mapped markers was estimated to be 1151 centimorgans. By including a variety of morphologic, biochemical, immunogenetic, and molecular markers, the current map integrates and extends existing linkage data and should facilitate rat gene mapping and genetic studies of hypertension and other complex phenotypes of interest in the HXB and BXH recombinant inbred strains.
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Affiliation(s)
- M Pravenec
- Institute of Physiology, Czech Academy of Sciences, Prague
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Schott JJ, Charpentier F, Peltier S, Foley P, Drouin E, Bouhour JB, Donnelly P, Vergnaud G, Bachner L, Moisan JP. Mapping of a gene for long QT syndrome to chromosome 4q25-27. Am J Hum Genet 1995; 57:1114-22. [PMID: 7485162 PMCID: PMC1801360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Long QT syndrome (LQTS) is a heterogeneous inherited disorder causing syncope and sudden death from ventricular arrhythmias. A first locus for this disorder was mapped to chromosome 11p15.5. However, locus heterogeneity has been demonstrated in several families, and two other loci have recently been located on chromosomes 7q35-36 and 3p21-24. We used linkage analysis to map the locus in a 65-member family in which LQTS was associated with more marked sinus bradycardia than usual, leading to sinus node dysfunction. Linkage to chromosome 11p15.5, 7q35-36, or 3p21-24 was excluded. Positive linkage was obtained for markers located on chromosome 4q25-27. A maximal LOD score of 7.05 was found for marker D4S402. The identification of a fourth locus for LQTS confirms its genetic heterogeneity. Locus 4q25-27 is associated with a peculiar phenotype within the LQTS entity.
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Affiliation(s)
- J J Schott
- Laboratoire de Physiopathologie et Pharmacologie Cellulaires et Moléculaires, URA CNRS 1340, CHU de Nantes, France
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40
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Pravenec M, Gauguier D, Schott JJ, Buard J, Kren V, Bila V, Szpirer C, Szpirer J, Wang JM, Huang H. Mapping of quantitative trait loci for blood pressure and cardiac mass in the rat by genome scanning of recombinant inbred strains. J Clin Invest 1995; 96:1973-8. [PMID: 7560090 PMCID: PMC185835 DOI: 10.1172/jci118244] [Citation(s) in RCA: 130] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
In the HXB and BXH recombinant inbred strains derived from the spontaneously hypertensive rat and the normotensive Brown Norway rat, we determined the strain distribution patterns of 500 genetic markers to scan the rodent genome for quantitative trait loci regulating cardiac mass and blood pressure. The markers spanned approximately 1,139 cM of the genome and were tested for correlations with left ventricular mass adjusted for body weight, and with systolic, diastolic, and mean arterial pressures. The marker for the dopamine 1A receptor (Drd1a) on chromosome 17 showed the strongest correlation with left ventricular heart weight (P = .00038, r = -0.59) and the relationship to heart weight was independent of blood pressure. The markers showing the strongest correlations with systolic, diastolic, and mean arterial pressure were D19Mit7 on chromosome 19 (P = .0012, r = .55), D2N35 on chromosome 2 (P = .0008, r = .56), and Il6 on chromosome 4 (P = .0018, r = .53), respectively. These studies demonstrate that the HXB and BXH strains can be effectively used for genome scanning studies of complex traits and have revealed several chromosome regions that may be involved in the genetic control of blood pressure and cardiac mass in the rat.
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Affiliation(s)
- M Pravenec
- Institute of Physiology, Czech Academy of Sciences, Prague, Czech Republic
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41
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James MR, Richard CW, Schott JJ, Yousry C, Clark K, Bell J, Terwilliger JD, Hazan J, Dubay C, Vignal A. A radiation hybrid map of 506 STS markers spanning human chromosome 11. Nat Genet 1994; 8:70-6. [PMID: 7987395 DOI: 10.1038/ng0994-70] [Citation(s) in RCA: 101] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
We present a high resolution radiation hybrid map of human chromosome 11 using 506 sequence tagged sites (STSs) scored on a panel of 86 radiation hybrids. The 506 STSs fall into 299 unique positions (average resolution of about 480 kilobases (kb)) that span the whole chromosome. A subset of 260 STSs (143 positions) form a framework map that has a resolution of approximately 1 megabase between adjacent positions and is ordered with odds of at least 1,000:1. The centromere was clearly defined with pericentric markers unambiguously assigned to the short or long arm. The map contains most genes (125) and expressed sequence tags (26) currently assigned to chromosome 11 and more than half of the STSs are polymorphic microsatellite loci. These markers and the map can be used for high resolution physical and genetic mapping.
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Vergnaud G, Gauguier D, Schott JJ, Lepetit D, Lauthier V, Mariat D, Buard J. Detection, cloning, and distribution of minisatellites in some mammalian genomes. EXS 1993; 67:47-57. [PMID: 8400714 DOI: 10.1007/978-3-0348-8583-6_4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The chromosomal distribution of minisatellites (cloned and/or detected using natural or synthetic tandem repeats) is strikingly different in man and mouse. In man, the vast majority is clustered in the terminal band of a subset of chromosome arms. Interestingly, the class of shorter tandem repeats called microsatellites is widespread along the chromosomes, suggesting that minisatellites can be created or maintained only in certain regions. In order to gain a better knowledge of these areas, we have studied a sub-telomeric cosmid from the pseudoautosomal region. Sixty kilobases of human genomic DNA starting approximately 20 kilobases from the human sex chromosomes telomere have previously been independently isolated in two cosmid clones (locus DXYS14) (Cooke et al., 1985); Rouyer et al., 1986). We have studied in more detail one of the two cosmids from this locus and found that it contains four different minisatellite structures representing 20 kilobases of the cosmid. These structures are unrelated to each other or to the minisatellite family described by Jeffreys et al. (1985). They display different degrees of polymorphism correlated with varying amounts of inner homogeneity. Combined with the previous description of an additional minisatellite (Cooke et al., 1985; Inglehearn and Cooke, 1990) in the contiguous cosmid, our observation shows that these structures may represent an important proportion of the DNA in sub-telomeric regions.
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Affiliation(s)
- G Vergnaud
- Laboratoire de Génétique Moléculaire, Centre d'Etudes du Bouchet, Vert le Petit, France
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Schott JJ, Dufour JL, Gauvrit C. Effects of adjuvants on herbicidal action. III. Effects of petroleum and rapeseed oils on diclofop-methyl action on ryegrass. ACTA ACUST UNITED AC 1991. [DOI: 10.1051/agro:19910104] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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