Mus musculus
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA395002 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR5839510.fastq.gz | Fastqsanger.gz | |||
| SRR5839511.fastq.gz | Fastqsanger.gz | |||
| SRR5839512.fastq.gz | Fastqsanger.gz | |||
| SRR5839507.fastq.gz | Fastqsanger.gz | |||
| SRR5839508.fastq.gz | Fastqsanger.gz |
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Project description:Ventricular T-box 5 in the adult heart ensures normal cardiac conduction and protects from pathologic cardiac remodeling
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Project description:Ventricular T-box 5 in the adult heart ensures normal cardiac conduction and protects from pathologic cardiac remodeling [ChIP-seq]
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Project description:Sudden cardiac death is the number one cause of death worldwide. Major causes of sudden cardiac death include myocardial infarction and cardiomyopathies. To develop novel therapeutic strategies, we need to identify key factors that are required for proper cardiac function and are dysregulated in the diseased heart. Under this notion, we found T-box 5 (TBX5), a transcription factor regarded solely in the context of congenital heart disease, to be downregulated in human diseased left ventricles. To investigate the effects of TBX5 loss in the adult heart, we generated an inducible ventricular cardiomyocyte specific knock-out mouse model (vTbx5KO). We performed integrative genome-wide chromatin occupancy and transcriptomic analysis and identified 47 downregulated transcripts in vTbx5KO that contain TBX5 active enhancers. The TBX5 targets in the ventricle included genes implicated in cardiac conduction and contraction (Gja1, Kcnj5, Kcng2, Cacna1g, Chrm2), cytoskeleton organization (Fstl4, Pdlim4, Emilin2, Cmya5) as well as cardiac protection upon stress (Fhl2, Gpr22, Fgf16). In line with this analysis, vTbx5KO mice presented cardiac conduction defects and arrhythmias at baseline as well as exacerbated cardiac remodeling upon Angiotensin II-induced hypertrophy. In conclusion, this study uncovers a novel protective role of TBX5 upon cardiac remodeling and renders TBX5 as an interesting therapeutic target.
2020-07-19 | GSE101614 | GEO
Project description:Sudden cardiac death is the number one cause of death worldwide. Major causes of sudden cardiac death include myocardial infarction and cardiomyopathies. To develop novel therapeutic strategies, we need to identify key factors that are required for proper cardiac function and are dysregulated in the diseased heart. Under this notion, we found T-box 5 (TBX5), a transcription factor regarded solely in the context of congenital heart disease, to be downregulated in human diseased left ventricles. To investigate the effects of TBX5 loss in the adult heart, we generated an inducible ventricular cardiomyocyte specific knock-out mouse model (vTbx5KO). We performed integrative genome-wide chromatin occupancy and transcriptomic analysis and identified 47 downregulated transcripts in vTbx5KO that contain TBX5 active enhancers. The TBX5 targets in the ventricle included genes implicated in cardiac conduction and contraction (Gja1, Kcnj5, Kcng2, Cacna1g, Chrm2), cytoskeleton organization (Fstl4, Pdlim4, Emilin2, Cmya5) as well as cardiac protection upon stress (Fhl2, Gpr22, Fgf16). In line with this analysis, vTbx5KO mice presented cardiac conduction defects and arrhythmias at baseline as well as exacerbated cardiac remodeling upon Angiotensin II-induced hypertrophy. In conclusion, this study uncovers a novel protective role of TBX5 upon cardiac remodeling and renders TBX5 as an interesting therapeutic target.
2020-07-19 | GSE101613 | GEO
Project description:T-box transcription factors play critical roles in the development and identity of the heart. Tbx5 has been implicated as a regulator of the fast-conducting, ventricular conduction system, while Tbx3 has been implicated as a regulator of the slow-conducting node. We hypothesize TBX5 and TBX3 share common binding sites in cardiomyocytes to positively or negatively regulate transcription, respectively, for cardiac cell identity and conduction. To this end, we performed ChIP-sequencing to identify localization of TBX5 during fetal heart development and have compared it with previously published histone (GEO Series: GSE31039; ENCODE Accessions: ENCSR080GQM, ENCSR000CDL, ENCSR000CDM, ENCSR052CDF, ENCSR345RKE, ENCSR007XTC, ENCSR360ANE, ENCSR000CDK, and ENCSR357OED) and TBX3 ChIP-seq (GSM862695).
2020-04-21 | GSE139803 | GEO
Project description:PRDM16 is a transcription factor with histone methyltransferase activity expressed at the earliest stages of cardiac development. Pathogenic mutations in humans lead to cardiomyopathy, conduction abnormalities and heart failure. PRDM16 is specifically expressed in ventricular but not atrial cardiomyocytes and declines in expression postnatally. Since in other tissues PRDM16 is best known for its role in binary cell fate decisions, we hypothesized a similar decision-making function in cardiomyocytes. Here, we demonstrated that cardiomyocyte-specific deletion of Prdm16 during cardiac development results in contractile dysfunction and abnormal electrophysiology of the postnatal heart, resulting in premature death. By combined RNA+ATAC single-cell sequencing we found that PRDM16 favors ventricular working cardiomyocyte identity, by opposing the activity of master regulators of atrial and ventricular conduction fate. Myocardial loss of Prdm16 during development resulted in hyperplasia of the ventricular conduction system. Hence, PRDM16 plays an indispensable role during cardiac development by driving ventricular working cardiomyocyte identity.
2024-09-18 | GSE255382 | GEO
Project description:Hypertrophic cardiomyopathy (HCM) is one of the most frequent inherited heart condition and a well-established risk factor for cardiovascular mortality worldwide. Although hypertrophy is traditionally regarded as an adaptive response to increased workload caused by physiological or pathological stress, prolonged hypertrophy can lead to heart failure characterized by impaired systolic function, increased apoptosis, fibrosis, ventricular dilation, and impaired metabolic substrate flexibility. While the key regulators for cardiac hypertrophy are well studied, the role of Prdm16 in this process remains poorly understood. In the present study, we demonstrate that Prdm16 is dispensable for cardiac development. However, it is required in the adult heart to preserve mitochondrial function and inhibit hypertrophy with advanced age. Cardiac-specific deletion of Prdm16 results in cardiac hypertrophy, excessive ventricular fibrosis, mitochondrial dysfunction, and impaired metabolic flexibility, leading to heart failure. We demonstrate that Prdm16 and euchromatic histone-lysine N- methyltransferase factors (Ehmts) act together to reduce the expression of fetal genes reactivated in pathological hypertrophy by inhibiting the functions of pro- hypertrophic transcription factor Myc. Although young Prdm16 knockout mice show normal cardiac function, they are predisposed to develop heart failure in response to metabolic stress. Collectively, our results demonstrate that Prdm16 protects the heart against age-dependent cardiac hypertrophy, fibrosis, mitochondrial dysfunction, adverse metabolic remodeling, and heart failure.
2020-09-21 | GSE153988 | GEO
Project description:Left ventricular non-compaction (LVNC) is a rare cardiomyopathy associated with a hypertrabeculated phenotype and a large spectrum of symptoms. The developmental origins and mechanistic basis of varying severity of this pathology are unknown. To investigate these issues, we inactivated the cardiac transcription factor Nkx2-5 in trabecular myocardium at different stages of trabecular morphogenesis. Conditional deletion of Nkx2-5 at embryonic stages, during trabecular formation, provokes a severe hypertrabeculated phenotype associated with subendocardial fibrosis and Purkinje fiber hypoplasia. A milder phenotype was observed after Nkx2-5 deletion at fetal stages, during trabecular compaction. A longitudinal study of cardiac function in adult Nkx2-5 conditional mutant mice demonstrates that excessive trabeculation is associated with complex ventricular conduction defects, progressively leading to strain defects, and, in 50% of mutant mice, to heart failure. Progressive impaired cardiac function correlates with conduction and strain defects independently of the degree of hypertrabeculation. Transcriptomic analysis of molecular pathways reflects myocardial remodeling with a larger number of differentially expressed genes in the severe versus mild phenotype and identifies Six1 as a marker upregulated in hypertrabeculated hearts. Our results provide insights into the etiology of LVNC and link its pathogenicity with compromised trabecular development including compaction defects and ventricular conduction system hypoplasia.
2018-04-18 | GSE113251 | GEO
Project description:Radiotherapy (RT)-induced cardiac toxicity (RICT) is widely acknowledged as a major side effect of RT, which encompasses cardiovascular complications. Despite advances in understanding the underlying biological mechanisms, a complete characterisation of the molecular changes induced by RT in the different cardiac regions is still absent. Here, a multi-omics approach was adopted to longitudinally characterise the unique response to radiation in the heart base (including ventricular base and right atrium), or the apex of the heart. The ventricular base showed a cardiomyopathy phenotype, with pronounced molecular perturbations in metabolism and electrical conduction, while changes in tissue structure were predominant in ventricular apex. We then identified a molecular signature showing that base radiation-mediated remodelling leads to a higher incidence of atrial fibrillation (AF). This study represents a comprehensive characterisation of differential spatiotemporal radiation effects in the heart and highlights several biological pathways that are potentially clinically actionable for cardiac radioprotection and monitoring.
2025-11-20 | E-MTAB-14646 | biostudies-arrayexpress
Project description:Arrhythmias are a hallmark of myocardial infarction (MI) and increase patient mortality. The cardiac conduction system is implicated in arrhythmias, but how it is altered following MI is poorly understood. We demonstrate complete conduction system restoration during neonatal mouse heart regeneration, versus pathological remodelling at non-regenerative stages. Tissue-cleared whole-organ imaging identified disorganised bundling of conduction fibres after MI, global His/Purkinje disruption and regional loss of connexin-40. Single-cell RNA-sequencing revealed that Purkinje cells undergo specific molecular changes to regenerate the network, versus sustained aberrant electrical alterations during fibrotic repair. This manifested functionally as transition from normal rhythm to pathological conduction delay beyond the regenerative window. Modelling the non-regenerative phenotype in the infarcted human heart implicated these changes as causative for bundle branch block and ventricular dyssynchrony, as observed in patients. These findings elucidate the mechanisms underpinning conduction system regeneration versus repair and reveal the consequences of MI-induced damage for clinical arrhythmogenesis.
2024-10-31 | GSE245872 | GEO