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Anterior Heart Field (AHF)-conditional Mef2c Knockout

ABSTRACT: We have performed conditional inactivation of mef2c in the anterior heart field (AHF) of mice and observed a phenotypic spectrum of outflow tract anomalies in the conditional mutant hearts. In an effort to identify misregulated genes in the outflow tracts of the mutants, we have performed RNA-Seq on outflow tract samples dissected from E10.5 mutant and wild-type embryos. There are four wild-type samples and four mutant samples.

ORGANISM(S): Mus musculus

SUBMITTER: Brian Black

PROVIDER: E-GEOD-68147 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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MEF2C regulates outflow tract alignment and transcriptional control of Tdgf1.

Barnes Ralston M RM Harris Ian S IS Jaehnig Eric J EJ Sauls Kimberly K Sinha Tanvi T Rojas Anabel A Schachterle William W McCulley David J DJ Norris Russell A RA Black Brian L BL

Development (Cambridge, England) 20160125 5

Congenital heart defects are the most common birth defects in humans, and those that affect the proper alignment of the outflow tracts and septation of the ventricles are a highly significant cause of morbidity and mortality in infants. A late differentiating population of cardiac progenitors, referred to as the anterior second heart field (AHF), gives rise to the outflow tract and the majority of the right ventricle and provides an embryological context for understanding cardiac outflow tract a ...[more]

PMID: 26811383

Similar Datasets

Anterior Heart Field (AHF)-conditional Mef2c Knockout

Project description:We have performed conditional inactivation of mef2c in the anterior heart field (AHF) of mice and observed a phenotypic spectrum of outflow tract anomalies in the conditional mutant hearts. In an effort to identify misregulated genes in the outflow tracts of the mutants, we have performed RNA-Seq on outflow tract samples dissected from E10.5 mutant and wild-type embryos.

2016-04-05 | GSE68147 | GEO

Reduced dosage of β-catenin genetically rescues intracardiac anomalies in a Tbx1 conditional null mouse model of 22q11.2 deletion syndrome

Project description:Approximately 60-70% of patients with 22q11.2 deletion syndrome (22q11.2DS; velo-cardio-facial syndrome/DiGeorge syndrome) have cardiac outflow tract anomalies including persistent truncus arteriosus (PTA) as the most severe defect. Among the genes in the 22q11.2 region, TBX1, encoding a T-box transcription factor is a major candidate for cardiovascular malformations and its inactivation in mice results in a PTA. To identify novel signaling mechanisms that function downstream, we found that Tbx1 restricts canonical Wnt signaling in the pharyngeal apparatus. To test for tissue specificity within the pharyngeal apparatus, we inactivated Tbx1 in the anterior portion of the secondary heart field (AHF) mesoderm using the Mef2c-AHF-Cre allele and observed a full penetrant PTA (n = 30). Tbx1 promotes progenitor cells but restricts differentiation whereas Wnt signaling, in the AHF, promotes cardiomyocyte differentiation. To determine whether Tbx1 and canonical Wnt signaling act in opposing pathways, both alleles of Tbx1 and one β-catenin allele were inactivated in the AHF and 85% of them (n = 35) showed partial or complete rescue. The antagonistic function of the two pathways was further confirmed by gene expression profiling, indicating that these two pathways provide a key balance in the AHF to prevent premature differentiation of progenitor cells prior to reaching the cardiac outflow tract.

2016-09-01 | GSE78125 | GEO

Reduced dosage of Î²-catenin genetically rescues intracardiac anomalies in a Tbx1 conditional null mouse model of 22q11.2 deletion syndrome

Project description:Approximately 60-70% of patients with 22q11.2 deletion syndrome (22q11.2DS; velo-cardio-facial syndrome/DiGeorge syndrome) have cardiac outflow tract anomalies including persistent truncus arteriosus (PTA) as the most severe defect. Among the genes in the 22q11.2 region, TBX1, encoding a T-box transcription factor is a major candidate for cardiovascular malformations and its inactivation in mice results in a PTA. To identify novel signaling mechanisms that function downstream, we found that Tbx1 restricts canonical Wnt signaling in the pharyngeal apparatus. To test for tissue specificity within the pharyngeal apparatus, we inactivated Tbx1 in the anterior portion of the secondary heart field (AHF) mesoderm using the Mef2c-AHF-Cre allele and observed a full penetrant PTA (n = 30). Tbx1 promotes progenitor cells but restricts differentiation whereas Wnt signaling, in the AHF, promotes cardiomyocyte differentiation. To determine whether Tbx1 and canonical Wnt signaling act in opposing pathways, both alleles of Tbx1 and one Î²-catenin allele were inactivated in the AHF and 85% of them (n = 35) showed partial or complete rescue. The antagonistic function of the two pathways was further confirmed by gene expression profiling, indicating that these two pathways provide a key balance in the AHF to prevent premature differentiation of progenitor cells prior to reaching the cardiac outflow tract. We inactivatedTbx1 and beta-catenin allele to identify function of Tbx1 and beta-catenin in the anterior portion of the secondary heart field (AHF) mesoderm. We also inactivated both alleles of Tbx1 and one Î²-catenin alleles (rescue design) to determine whether Tbx1 and canonical Wnt signaling act in opposing pathways

2016-09-01 | E-GEOD-78125 | biostudies-arrayexpress

Mus musculus

Project description:Anterior Heart Field (AHF)-conditional Mef2c Knockout

| PRJNA281945 | ENA

Transcritptome analysis of anterior dorsal pericardial wall (aDPW) and cardiac outflow tract (OFT) from control and Hand2flox/flox Mef2c-AHF-Cre embryos at E9.5

Project description:Transcritptome analysis of anterior dorsal pericardial wall (aDPW) and cardiac outflow tract (OFT) from control and Hand2flox/flox Mef2c-AHF-Cre embryos at E9.5

| PRJNA543339 | ENA

Heart tube morphogenesis is regulated by segment-specific gene regulatory networks controlled by MEF2C [snATAC-seq]

Project description:The transcription factor MEF2C plays a critical role in the development of the linear heart tube, but the specific transcriptional networks controlled by MEF2C remain largely undefined. To address this, we performed combined single-nucleus RNA- and ATAC- sequencing on wild type and MEF2C-null embryos at distinct stages of development. We identified a broadly “posteriorized” cardiac gene signature and chromatin landscape throughout the heart tube in the absence of MEF2C. By integrating our gene expression and chromatin accessibility data in a deep-learning based model, we were able to construct developmental trajectories for each of the outflow tract, ventricular, and inflow tract lineages and determined how each of these segment-specific trajectories were distinctly altered in the MEF2C-null embryos. We computationally identified potential segment-specific MEF2C-dependent enhancers. Using transgenesis in zebrafish embryos, we identified novel MEF2C-dependent enhancers with activity in the developing heart tube from among these candidates. Finally, using inferred gene regulatory networks we discovered a genetic interaction between MEF2C and the atrial nuclear hormone receptor NR2F2, revealing that the MEF2C-null heart malformations are partly driven by a transcriptional network with increased NR2F2 activity. These studies not only provide a rich description of the genomic regulation of early heart tube development, but provide a generalizable framework for using genetic mutants to dissect the transcriptional networks that govern developmental processes.

2024-11-04 | GSE280538 | GEO

Heart tube morphogenesis is regulated by segment-specific gene regulatory networks controlled by MEF2C [snRNA-Seq]

2024-11-04 | GSE280543 | GEO

An Anterior Second Heart Field Enhancer Regulates the Gene Regulatory Network of the Cardiac Outflow Tract

Project description:To identify a functional gene regulatory network that orchestrate transcriptional programs to direct proper outflow tract development, we generated transgenic mice harboring a 226bp-deletion within a GATA-dependent, highly conserved cardiac enhancer region. We then performed gene expression profiling analysis using data obtained from RNA-seq of outflow tract in wildtype and homozygous mutant littermates at embryonic day 12.5.

2023-10-04 | GSE227361 | GEO

Analysis of transcriptome changes in Kmt2d deletion in cardiac mesoderm, anterior heart field precursors and cardiomyocytes

Project description:KMT2D is required in the cardiac mesoderm, anterior heart field precursors and cardiomyocytes. Kmt2d deletion in cardiac mesoderm (Mesp1Cre) is embryonic lethal at E10.5 and mutants have hypoplastic hearts; Kmt2d deletion in anterior heart field precursors (Mef2cAHF::Cre) deletion is embryonic lethal at E13.5 and mutants have defects in septation of outflow tract and interventricular septum (IVS); Kmt2d deletion in cardiomyocytes (Tnnt2::Cre) deletion is embryonic lethal at E14.5 and mutants have defects in IVS septation and compact myocardium. The goal of this study is to compare changes in gene expression in these Kmt2d conditional deletion mutants and understand common or distinct pathways dysregulated in absence of KMT2D. Whole genome gene expression analysis was performed on RNA isolated from control and mutant embryonic hearts (or right ventricles and outflow tract for anterior heart field deletion samples). Libraries were prepared using Illumina TruSeq Paired-End Cluster Kit v3, and sequenced with the Illumina HiSeq 2500 system for pair-ended 100 base pairs (PE 100 bp).

2015-11-04 | E-GEOD-74679 | biostudies-arrayexpress

MEF2C hypofunction in neuronal and neuroimmune populations produces MEF2C haploinsufficiency syndrome behaviors in mice

Project description:Microdeletions of the MEF2C gene are linked to a syndromic form of autism termed MEF2C haploinsufficiency syndrome (MCHS). Here, we show that MCHS-associated missense mutations cluster in the conserved DNA binding domain and disrupt MEF2C DNA binding. DNA binding-deficient global Mef2c heterozygous mice (Mef2c-Het) display numerous MCHS-like behaviors, including autism-related behaviors, as well as deficits in cortical excitatory synaptic transmission. We find that hundreds of genes are dysregulated in Mef2c-Het cortex, including significant enrichments of autism risk and excitatory neuron genes. In addition, we observe an enrichment of upregulated microglial genes, but not due to neuroinflammation in the Mef2c-Het cortex. Importantly, conditional Mef2c heterozygosity in forebrain excitatory neurons reproduces a subset of the Mef2c-Het phenotypes, while conditional Mef2c heterozygosity in microglia reproduces social deficits and repetitive behavior. Together our findings suggest that MEF2C regulates typical brain development and function through multiple cell types, including excitatory neuronal and neuroimmune populations.

2020-10-24 | GSE139419 | GEO

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