Tbx20 is required in mid-gestation cardiomyocytes and plays a central role in atrial development
Rationale: Mutations in the transcription factor TBX20 (T-box 20) are associated with congenital heart disease. Germline ablation of Tbx20 results in abnormal heart development and embryonic lethality by embryonic day 9.5. Because Tbx20 is expressed in multiple cell lineages required for myocardial...
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| Hauptverfasser: | , , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
14 Jun 2018
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| In: |
Circulation research
Year: 2018, Jahrgang: 123, Heft: 4, Pages: 428-442 |
| ISSN: | 1524-4571 |
| DOI: | 10.1161/CIRCRESAHA.118.311339 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1161/CIRCRESAHA.118.311339 Verlag, lizenzpflichtig, Volltext: https://www.ahajournals.org/doi/10.1161/CIRCRESAHA.118.311339 
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| Verfasserangaben: | Cornelis J. Boogerd, Xiaoming Zhu, Ivy Aneas, Noboru Sakabe, Lunfeng Zhang, Debora R. Sobreira, Lindsey Montefiori, Julius Bogomolovas, Amelia C. Joslin, Bin Zhou, Ju Chen, Marcelo A. Nobrega, and Sylvia M. Evans |
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| 100 | 1 | |a Boogerd, Cornelis J. |e VerfasserIn |0 (DE-588)1207504831 |0 (DE-627)1693852624 |4 aut | |
| 245 | 1 | 0 | |a Tbx20 is required in mid-gestation cardiomyocytes and plays a central role in atrial development |c Cornelis J. Boogerd, Xiaoming Zhu, Ivy Aneas, Noboru Sakabe, Lunfeng Zhang, Debora R. Sobreira, Lindsey Montefiori, Julius Bogomolovas, Amelia C. Joslin, Bin Zhou, Ju Chen, Marcelo A. Nobrega, and Sylvia M. Evans |
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| 520 | |a Rationale: Mutations in the transcription factor TBX20 (T-box 20) are associated with congenital heart disease. Germline ablation of Tbx20 results in abnormal heart development and embryonic lethality by embryonic day 9.5. Because Tbx20 is expressed in multiple cell lineages required for myocardial development, including pharyngeal endoderm, cardiogenic mesoderm, endocardium, and myocardium, the cell type-specific requirement for TBX20 in early myocardial development remains to be explored. Objective: Here, we investigated roles of TBX20 in midgestation cardiomyocytes for heart development. Methods and Results: Ablation of Tbx20 from developing cardiomyocytes using a doxycycline inducible cTnTCre transgene led to embryonic lethality. The circumference of developing ventricular and atrial chambers, and in particular that of prospective left atrium, was significantly reduced in Tbx20 conditional knockout mutants. Cell cycle analysis demonstrated reduced proliferation of Tbx20 mutant cardiomyocytes and their arrest at the G1-S phase transition. Genome-wide transcriptome analysis of mutant cardiomyocytes revealed differential expression of multiple genes critical for cell cycle regulation. Moreover, atrial and ventricular gene programs seemed to be aberrantly regulated. Putative direct TBX20 targets were identified using TBX20 ChIP-Seq (chromatin immunoprecipitation with high throughput sequencing) from embryonic heart and included key cell cycle genes and atrial and ventricular specific genes. Notably, TBX20 bound a conserved enhancer for a gene key to atrial development and identity, COUP-TFII/Nr2f2 (chicken ovalbumin upstream promoter transcription factor 2/nuclear receptor subfamily 2, group F, member 2). This enhancer interacted with the NR2F2 promoter in human cardiomyocytes and conferred atrial specific gene expression in a transgenic mouse in a TBX20-dependent manner.Conclusions: Myocardial TBX20 directly regulates a subset of genes required for fetal cardiomyocyte proliferation, including those required for the G1-S transition. TBX20 also directly downregulates progenitor-specific genes and, in addition to regulating genes that specify chamber versus nonchamber myocardium, directly activates genes required for establishment or maintenance of atrial and ventricular identity. TBX20 plays a previously unappreciated key role in atrial development through direct regulation of an evolutionarily conserved COUPT-FII enhancer. | ||
| 700 | 1 | |a Zhu, Xiaoming |e VerfasserIn |4 aut | |
| 700 | 1 | |a Aneas, Ivy |e VerfasserIn |4 aut | |
| 700 | 1 | |a Sakabe, Noboru |e VerfasserIn |4 aut | |
| 700 | 1 | |a Zhang, Lunfeng |e VerfasserIn |4 aut | |
| 700 | 1 | |a Sobreira, Debora R. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Montefiori, Lindsey |e VerfasserIn |4 aut | |
| 700 | 1 | |a Bogomolovas, Julius |d 1987- |e VerfasserIn |0 (DE-588)1033393177 |0 (DE-627)741154846 |0 (DE-576)380991047 |4 aut | |
| 700 | 1 | |a Joslin, Amelia C. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Zhou, Bin |e VerfasserIn |4 aut | |
| 700 | 1 | |a Chen, Ju |e VerfasserIn |4 aut | |
| 700 | 1 | |a Nobrega, Marcelo A. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Evans, Sylvia M. |e VerfasserIn |4 aut | |
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