Nkx2-5 Pathways and Congenital Heart Disease: Loss of Ventricular Myocyte Lineage Specification Leads to Progressive Cardiomyopathy and Complete Heart Block

Human mutations in Nkx2-5 lead to progressive cardiomyopathy and conduction defects via unknown mechanisms. To define these pathways, we generated mice with a ventricular-restricted knockout of Nkx2-5, which display no structural defects but have progressive complete heart block, and massive trabecu...

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Veröffentlicht in:Cell 2004-04, Vol.117 (3), p.373-386
Hauptverfasser: Pashmforoush, Mohammad, Lu, Jonathan T, Chen, Hanying, Amand, Tara St, Kondo, Richard, Pradervand, Sylvain, Evans, Sylvia M, Clark, Bob, Feramisco, James R, Giles, Wayne, Ho, Siew Yen, Benson, D.Woodrow, Silberbach, Michael, Shou, Weinian, Chien, Kenneth R
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container_title Cell
container_volume 117
creator Pashmforoush, Mohammad
Lu, Jonathan T
Chen, Hanying
Amand, Tara St
Kondo, Richard
Pradervand, Sylvain
Evans, Sylvia M
Clark, Bob
Feramisco, James R
Giles, Wayne
Ho, Siew Yen
Benson, D.Woodrow
Silberbach, Michael
Shou, Weinian
Chien, Kenneth R
description Human mutations in Nkx2-5 lead to progressive cardiomyopathy and conduction defects via unknown mechanisms. To define these pathways, we generated mice with a ventricular-restricted knockout of Nkx2-5, which display no structural defects but have progressive complete heart block, and massive trabecular muscle overgrowth found in some patients with Nkx2-5 mutations. At birth, mutant mice display a hypoplastic atrioventricular (AV) node and then develop selective dropout of these conduction cells. Transcriptional profiling uncovered the aberrant expression of a unique panel of atrial and conduction system-restricted target genes, as well as the ectopic, high level BMP-10 expression in the adult ventricular myocardium. Further, BMP-10 is shown to be necessary and sufficient for a major component of the ventricular muscle defects. Accordingly, loss of ventricular muscle cell lineage specification into trabecular and conduction system myocytes is a new mechanistic pathway for progressive cardiomyopathy and conduction defects in congenital heart disease.
doi_str_mv 10.1016/S0092-8674(04)00405-2
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subjects Acetylcholinesterase - metabolism
Aging
Animals
Animals, Newborn
Cardiomyopathies - genetics
Cardiomyopathies - pathology
Cell Lineage
Electric Conductivity
Electrocardiography
Gene Deletion
Gene Expression
Gene Expression Profiling
Gene Targeting
Genes, Reporter
Heart Block - embryology
Heart Block - genetics
Heart Block - physiopathology
Heart Defects, Congenital - complications
Heart Defects, Congenital - physiopathology
Heart Ventricles - cytology
Homeobox Protein Nkx-2.5
Homeodomain Proteins - genetics
Homeodomain Proteins - metabolism
Humans
Mice
Mice, Knockout
Myocytes, Cardiac - cytology
Reproducibility of Results
Time Factors
Transcription Factors - deficiency
Transcription Factors - genetics
Transcription Factors - metabolism
Transcription, Genetic
title Nkx2-5 Pathways and Congenital Heart Disease: Loss of Ventricular Myocyte Lineage Specification Leads to Progressive Cardiomyopathy and Complete Heart Block
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