Nkx2-5 Loss of Function in the His-Purkinje ...
Document type :
Article dans une revue scientifique
DOI :
Title :
Nkx2-5 Loss of Function in the His-Purkinje System Hampers Its Maturation and Leads to Mechanical Dysfunction
Author(s) :
Choquet, Caroline [Auteur]
Marseille medical genetics - Centre de génétique médicale de Marseille [MMG]
Institut de Biologie du Développement de Marseille [IBDM]
Sicard, Pierre [Auteur]
Physiologie & médecine expérimentale du Cœur et des Muscles [U 1046] [PhyMedExp]
Vahdat, Juliette [Auteur]
Institut de Biologie du Développement de Marseille [IBDM]
Nguyen, Thi Hong Minh [Auteur]
Hanoi University of Science and Technology [HUST]
Transcriptomique et génomique appliquée - Transcriptomics and Applied Genomics [TAG]
Institut de Biologie du Développement de Marseille [IBDM]
Kober, Frank [Auteur]
Centre de résonance magnétique biologique et médicale [CRMBM]
Varlet, Isabelle [Auteur]
Centre de résonance magnétique biologique et médicale [CRMBM]
Bernard, Monique [Auteur]
Centre de résonance magnétique biologique et médicale [CRMBM]
Richard, Sylvain [Auteur]
Physiologie & médecine expérimentale du Cœur et des Muscles [U 1046] [PhyMedExp]
Kelly, Robert [Auteur]
Institut de Biologie du Développement de Marseille [IBDM]
Lalevée, Nathalie [Auteur]
Transcriptomique et génomique appliquée - Transcriptomics and Applied Genomics [TAG]
Centre recherche en CardioVasculaire et Nutrition = Center for CardioVascular and Nutrition research [C2VN]
Miquerol, Lucile [Auteur]
Institut de Biologie du Développement de Marseille [IBDM]
Marseille medical genetics - Centre de génétique médicale de Marseille [MMG]
Institut de Biologie du Développement de Marseille [IBDM]
Sicard, Pierre [Auteur]
Physiologie & médecine expérimentale du Cœur et des Muscles [U 1046] [PhyMedExp]
Vahdat, Juliette [Auteur]
Institut de Biologie du Développement de Marseille [IBDM]
Nguyen, Thi Hong Minh [Auteur]
Hanoi University of Science and Technology [HUST]
Transcriptomique et génomique appliquée - Transcriptomics and Applied Genomics [TAG]
Institut de Biologie du Développement de Marseille [IBDM]
Kober, Frank [Auteur]
Centre de résonance magnétique biologique et médicale [CRMBM]
Varlet, Isabelle [Auteur]
Centre de résonance magnétique biologique et médicale [CRMBM]
Bernard, Monique [Auteur]
Centre de résonance magnétique biologique et médicale [CRMBM]
Richard, Sylvain [Auteur]
Physiologie & médecine expérimentale du Cœur et des Muscles [U 1046] [PhyMedExp]
Kelly, Robert [Auteur]
Institut de Biologie du Développement de Marseille [IBDM]
Lalevée, Nathalie [Auteur]
Transcriptomique et génomique appliquée - Transcriptomics and Applied Genomics [TAG]
Centre recherche en CardioVasculaire et Nutrition = Center for CardioVascular and Nutrition research [C2VN]
Miquerol, Lucile [Auteur]
Institut de Biologie du Développement de Marseille [IBDM]
Journal title :
JOURNAL OF CARDIOVASCULAR DEVELOPMENT AND DISEASE
Pages :
194
Publisher :
MDPI
Publication date :
2023-05
English keyword(s) :
His-Purkinje system
fast conduction markers
RSR’ complex
Cx40
cell dropout
strain defects
cardiac dyssynchrony
fast conduction markers
RSR’ complex
Cx40
cell dropout
strain defects
cardiac dyssynchrony
HAL domain(s) :
Sciences du Vivant [q-bio]/Médecine humaine et pathologie/Cardiologie et système cardiovasculaire
Sciences du Vivant [q-bio]/Biochimie, Biologie Moléculaire/Génomique, Transcriptomique et Protéomique [q-bio.GN]
Sciences du Vivant [q-bio]/Biologie du développement
Sciences du Vivant [q-bio]/Biochimie, Biologie Moléculaire/Génomique, Transcriptomique et Protéomique [q-bio.GN]
Sciences du Vivant [q-bio]/Biologie du développement
English abstract : [en]
The ventricular conduction or His-Purkinje system (VCS) mediates the rapid propagation and precise delivery of electrical activity essential for the synchronization of heartbeats. Mutations in the transcription factor ...
Show more >The ventricular conduction or His-Purkinje system (VCS) mediates the rapid propagation and precise delivery of electrical activity essential for the synchronization of heartbeats. Mutations in the transcription factor Nkx2-5 have been implicated in a high prevalence of developing ventricular conduction defects or arrhythmias with age. Nkx2-5 heterozygous mutant mice reproduce human phenotypes associated with a hypoplastic His-Purkinje system resulting from defective patterning of the Purkinje fiber network during development. Here, we investigated the role of Nkx2-5 in the mature VCS and the consequences of its loss on cardiac function. Neonatal deletion of Nkx2-5 in the VCS using a Cx40-CreERT2 mouse line provoked apical hypoplasia and maturation defects of the Purkinje fiber network. Genetic tracing analysis demonstrated that neonatal Cx40-positive cells fail to maintain a conductive phenotype after Nkx2-5 deletion. Moreover, we observed a progressive loss of expression of fast-conduction markers in persistent Purkinje fibers. Consequently, Nkx2-5-deleted mice developed conduction defects with progressively reduced QRS amplitude and RSR’ complex associated with higher duration. Cardiac function recorded by MRI revealed a reduction in the ejection fraction in the absence of morphological changes. With age, these mice develop a ventricular diastolic dysfunction associated with dyssynchrony and wall-motion abnormalities without indication of fibrosis. These results highlight the requirement of postnatal expression of Nkx2-5 in the maturation and maintenance of a functional Purkinje fiber network to preserve contraction synchrony and cardiac function.Show less >
Show more >The ventricular conduction or His-Purkinje system (VCS) mediates the rapid propagation and precise delivery of electrical activity essential for the synchronization of heartbeats. Mutations in the transcription factor Nkx2-5 have been implicated in a high prevalence of developing ventricular conduction defects or arrhythmias with age. Nkx2-5 heterozygous mutant mice reproduce human phenotypes associated with a hypoplastic His-Purkinje system resulting from defective patterning of the Purkinje fiber network during development. Here, we investigated the role of Nkx2-5 in the mature VCS and the consequences of its loss on cardiac function. Neonatal deletion of Nkx2-5 in the VCS using a Cx40-CreERT2 mouse line provoked apical hypoplasia and maturation defects of the Purkinje fiber network. Genetic tracing analysis demonstrated that neonatal Cx40-positive cells fail to maintain a conductive phenotype after Nkx2-5 deletion. Moreover, we observed a progressive loss of expression of fast-conduction markers in persistent Purkinje fibers. Consequently, Nkx2-5-deleted mice developed conduction defects with progressively reduced QRS amplitude and RSR’ complex associated with higher duration. Cardiac function recorded by MRI revealed a reduction in the ejection fraction in the absence of morphological changes. With age, these mice develop a ventricular diastolic dysfunction associated with dyssynchrony and wall-motion abnormalities without indication of fibrosis. These results highlight the requirement of postnatal expression of Nkx2-5 in the maturation and maintenance of a functional Purkinje fiber network to preserve contraction synchrony and cardiac function.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
Source :
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