Mediator complex proximal Tail subunit MED30 is critical for Mediator core stability and cardiomyocyte transcriptional network.
Dysregulation of cardiac transcription programs has been identified in patients and families with heart failure, as well as those with morphological and functional forms of congenital heart defects. Mediator is a multi-subunit complex that plays a central role in transcription initiation by integrat...
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oai:doaj.org-article:18fca6d6e79348038660f42598de6a012021-12-02T20:03:20ZMediator complex proximal Tail subunit MED30 is critical for Mediator core stability and cardiomyocyte transcriptional network.1553-73901553-740410.1371/journal.pgen.1009785https://doaj.org/article/18fca6d6e79348038660f42598de6a012021-09-01T00:00:00Zhttps://doi.org/10.1371/journal.pgen.1009785https://doaj.org/toc/1553-7390https://doaj.org/toc/1553-7404Dysregulation of cardiac transcription programs has been identified in patients and families with heart failure, as well as those with morphological and functional forms of congenital heart defects. Mediator is a multi-subunit complex that plays a central role in transcription initiation by integrating regulatory signals from gene-specific transcriptional activators to RNA polymerase II (Pol II). Recently, Mediator subunit 30 (MED30), a metazoan specific Mediator subunit, has been associated with Langer-Giedion syndrome (LGS) Type II and Cornelia de Lange syndrome-4 (CDLS4), characterized by several abnormalities including congenital heart defects. A point mutation in MED30 has been identified in mouse and is associated with mitochondrial cardiomyopathy. Very recent structural analyses of Mediator revealed that MED30 localizes to the proximal Tail, anchoring Head and Tail modules, thus potentially influencing stability of the Mediator core. However, in vivo cellular and physiological roles of MED30 in maintaining Mediator core integrity remain to be tested. Here, we report that deletion of MED30 in embryonic or adult cardiomyocytes caused rapid development of cardiac defects and lethality. Importantly, cardiomyocyte specific ablation of MED30 destabilized Mediator core subunits, while the kinase module was preserved, demonstrating an essential role of MED30 in stability of the overall Mediator complex. RNAseq analyses of constitutive cardiomyocyte specific Med30 knockout (cKO) embryonic hearts and inducible cardiomyocyte specific Med30 knockout (icKO) adult cardiomyocytes further revealed critical transcription networks in cardiomyocytes controlled by Mediator. Taken together, our results demonstrated that MED30 is essential for Mediator stability and transcriptional networks in both developing and adult cardiomyocytes. Our results affirm the key role of proximal Tail modular subunits in maintaining core Mediator stability in vivo.Changming TanSiting ZhuZee ChenCanzhao LiuYang E LiMason ZhuZhiyuan ZhangZhiwei ZhangLunfeng ZhangYusu GuZhengyu LiangThomas G BoyerKunfu OuyangSylvia M EvansXi FangPublic Library of Science (PLoS)articleGeneticsQH426-470ENPLoS Genetics, Vol 17, Iss 9, p e1009785 (2021) |
| institution |
DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
Genetics QH426-470 |
| spellingShingle |
Genetics QH426-470 Changming Tan Siting Zhu Zee Chen Canzhao Liu Yang E Li Mason Zhu Zhiyuan Zhang Zhiwei Zhang Lunfeng Zhang Yusu Gu Zhengyu Liang Thomas G Boyer Kunfu Ouyang Sylvia M Evans Xi Fang Mediator complex proximal Tail subunit MED30 is critical for Mediator core stability and cardiomyocyte transcriptional network. |
| description |
Dysregulation of cardiac transcription programs has been identified in patients and families with heart failure, as well as those with morphological and functional forms of congenital heart defects. Mediator is a multi-subunit complex that plays a central role in transcription initiation by integrating regulatory signals from gene-specific transcriptional activators to RNA polymerase II (Pol II). Recently, Mediator subunit 30 (MED30), a metazoan specific Mediator subunit, has been associated with Langer-Giedion syndrome (LGS) Type II and Cornelia de Lange syndrome-4 (CDLS4), characterized by several abnormalities including congenital heart defects. A point mutation in MED30 has been identified in mouse and is associated with mitochondrial cardiomyopathy. Very recent structural analyses of Mediator revealed that MED30 localizes to the proximal Tail, anchoring Head and Tail modules, thus potentially influencing stability of the Mediator core. However, in vivo cellular and physiological roles of MED30 in maintaining Mediator core integrity remain to be tested. Here, we report that deletion of MED30 in embryonic or adult cardiomyocytes caused rapid development of cardiac defects and lethality. Importantly, cardiomyocyte specific ablation of MED30 destabilized Mediator core subunits, while the kinase module was preserved, demonstrating an essential role of MED30 in stability of the overall Mediator complex. RNAseq analyses of constitutive cardiomyocyte specific Med30 knockout (cKO) embryonic hearts and inducible cardiomyocyte specific Med30 knockout (icKO) adult cardiomyocytes further revealed critical transcription networks in cardiomyocytes controlled by Mediator. Taken together, our results demonstrated that MED30 is essential for Mediator stability and transcriptional networks in both developing and adult cardiomyocytes. Our results affirm the key role of proximal Tail modular subunits in maintaining core Mediator stability in vivo. |
| format |
article |
| author |
Changming Tan Siting Zhu Zee Chen Canzhao Liu Yang E Li Mason Zhu Zhiyuan Zhang Zhiwei Zhang Lunfeng Zhang Yusu Gu Zhengyu Liang Thomas G Boyer Kunfu Ouyang Sylvia M Evans Xi Fang |
| author_facet |
Changming Tan Siting Zhu Zee Chen Canzhao Liu Yang E Li Mason Zhu Zhiyuan Zhang Zhiwei Zhang Lunfeng Zhang Yusu Gu Zhengyu Liang Thomas G Boyer Kunfu Ouyang Sylvia M Evans Xi Fang |
| author_sort |
Changming Tan |
| title |
Mediator complex proximal Tail subunit MED30 is critical for Mediator core stability and cardiomyocyte transcriptional network. |
| title_short |
Mediator complex proximal Tail subunit MED30 is critical for Mediator core stability and cardiomyocyte transcriptional network. |
| title_full |
Mediator complex proximal Tail subunit MED30 is critical for Mediator core stability and cardiomyocyte transcriptional network. |
| title_fullStr |
Mediator complex proximal Tail subunit MED30 is critical for Mediator core stability and cardiomyocyte transcriptional network. |
| title_full_unstemmed |
Mediator complex proximal Tail subunit MED30 is critical for Mediator core stability and cardiomyocyte transcriptional network. |
| title_sort |
mediator complex proximal tail subunit med30 is critical for mediator core stability and cardiomyocyte transcriptional network. |
| publisher |
Public Library of Science (PLoS) |
| publishDate |
2021 |
| url |
https://doaj.org/article/18fca6d6e79348038660f42598de6a01 |
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