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Direct Recruitment of Polycomb Repressive Complex 1 to Chromatin by Core Binding Transcription Factors

Author(s)
Yu, Ming; Mazor, Tali; Huang, Hui; Huang, Hsuan-Ting; Kathrein, Katie L.; Woo, Andrew J.; Chouinard, Candace R.; Labadorf, Adam; Akie, Thomas E.; Moran, Tyler B.; Xie, Huafeng; Zacharek, Sima; Taniuchi, Ichiro; Roeder, Robert G.; Kim, Carla F.; Zon, Leonard I.; Fraenkel, Ernest; Cantor, Alan B.; ... Show more Show less
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Abstract
Polycomb repressive complexes (PRCs) play key roles in developmental epigenetic regulation. Yet the mechanisms that target PRCs to specific loci in mammalian cells remain incompletely understood. In this study we show that Bmi1, a core component of Polycomb Repressive Complex 1 (PRC1), binds directly to the Runx1/CBFβ transcription factor complex. Genome-wide studies in megakaryocytic cells demonstrate significant chromatin occupancy overlap between the PRC1 core component Ring1b and Runx1/CBFβ and functional regulation of a considerable fraction of commonly bound genes. Bmi1/Ring1b and Runx1/CBFβ deficiencies generate partial phenocopies of one another in vivo. We also show that Ring1b occupies key Runx1 binding sites in primary murine thymocytes and that this occurs via PRC2-independent mechanisms. Genetic depletion of Runx1 results in reduced Ring1b binding at these sites in vivo. These findings provide evidence for site-specific PRC1 chromatin recruitment by core binding transcription factors in mammalian cells.
Date issued
2012-02
URI
http://hdl.handle.net/1721.1/91518
Department
Massachusetts Institute of Technology. Computer Science and Artificial Intelligence Laboratory; Massachusetts Institute of Technology. Department of Biological Engineering
Journal
Molecular Cell
Publisher
Elsevier
Citation
Yu, Ming, Tali Mazor, Hui Huang, Hsuan-Ting Huang, Katie L. Kathrein, Andrew J. Woo, Candace R. Chouinard, et al. “Direct Recruitment of Polycomb Repressive Complex 1 to Chromatin by Core Binding Transcription Factors.” Molecular Cell 45, no. 3 (February 2012): 330–343. © 2012 Elsevier Inc.
Version: Final published version
ISSN
10972765
1097-4164

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