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Ward C, Volpe G, Cauchy P, Ptasinska A, Almaghrabi R, Blakemore D, Nafria M, Kestner D, Frampton J, Murphy G, Buganim Y, Kaji K, García P. Fine-Tuning Mybl2 Is Required for Proper Mesenchymal-to-Epithelial Transition during Somatic Reprogramming. Cell Rep 2020; 24:1496-1511.e8. [PMID: 30089261 PMCID: PMC6092268 DOI: 10.1016/j.celrep.2018.07.026] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Revised: 05/18/2018] [Accepted: 07/06/2018] [Indexed: 12/20/2022] Open
Abstract
During somatic reprogramming, Yamanaka’s pioneer factors regulate a complex sequence of molecular events leading to the activation of a network of pluripotency factors, ultimately resulting in the acquisition and maintenance of a pluripotent state. Here, we show that, contrary to the pluripotency factors studied so far, overexpression of Mybl2 inhibits somatic reprogramming. Our results demonstrate that Mybl2 levels are crucial to the dynamics of the reprogramming process. Mybl2 overexpression changes chromatin conformation, affecting the accessibility of pioneer factors to the chromatin and promoting accessibility for early immediate response genes known to be reprogramming blockers. These changes in the chromatin landscape ultimately lead to a deregulation of key genes that are important for the mesenchymal-to-epithelial transition. This work defines Mybl2 level as a gatekeeper for the initiation of reprogramming, providing further insights into the tight regulation and required coordination of molecular events that are necessary for changes in cell fate identity during the reprogramming process. Deletion and overexpression of MYBL2 pluripotency factor inhibit somatic reprogramming Mybl2 overexpression affects the accessibility of pioneer factors to the chromatin Mybl2 overexpression promotes accessibility of reprogramming blockers to the chromatin High Mybl2 levels deregulate key genes for proper MET, a requirement for reprogramming
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Affiliation(s)
- Carl Ward
- Institute of Cancer and Genomic Science, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Giacomo Volpe
- Institute of Cancer and Genomic Science, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Pierre Cauchy
- Institute of Cancer and Genomic Science, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK; Department of Molecular and Cellular Immunology, Max Planck Institute of Immunobiology and Epigenetics, Freiburg, Germany
| | - Anetta Ptasinska
- Institute of Cancer and Genomic Science, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Ruba Almaghrabi
- Institute of Cancer and Genomic Science, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Daniel Blakemore
- Institute of Cancer and Genomic Science, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Monica Nafria
- Institute of Cancer and Genomic Science, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Doris Kestner
- Institute of Cancer and Genomic Science, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Jon Frampton
- Institute of Cancer and Genomic Science, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - George Murphy
- Department of Medicine, Boston University School of Medicine, Boston, MA, USA
| | - Yosef Buganim
- The Institute for Medical Research Israel-Canada, The Hebrew University Hadassah Medical School, Jerusalem, Israel
| | - Keisuke Kaji
- MRC Centre for Regenerative Medicine, University of Edinburgh, Edinburgh, UK
| | - Paloma García
- Institute of Cancer and Genomic Science, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK.
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