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Zouaz A, Auradkar A, Delfini MC, Macchi M, Barthez M, Ela Akoa S, Bastianelli L, Xie G, Deng WM, Levine SS, Graba Y, Saurin AJ. The Hox proteins Ubx and AbdA collaborate with the transcription pausing factor M1BP to regulate gene transcription. EMBO J 2017; 36:2887-2906. [PMID: 28871058 DOI: 10.15252/embj.201695751] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Revised: 08/02/2017] [Accepted: 08/07/2017] [Indexed: 11/09/2022] Open
Abstract
In metazoans, the pausing of RNA polymerase II at the promoter (paused Pol II) has emerged as a widespread and conserved mechanism in the regulation of gene transcription. While critical in recruiting Pol II to the promoter, the role transcription factors play in transitioning paused Pol II into productive Pol II is, however, little known. By studying how Drosophila Hox transcription factors control transcription, we uncovered a molecular mechanism that increases productive transcription. We found that the Hox proteins AbdA and Ubx target gene promoters previously bound by the transcription pausing factor M1BP, containing paused Pol II and enriched with promoter-proximal Polycomb Group (PcG) proteins, yet lacking the classical H3K27me3 PcG signature. We found that AbdA binding to M1BP-regulated genes results in reduction in PcG binding, the release of paused Pol II, increases in promoter H3K4me3 histone marks and increased gene transcription. Linking transcription factors, PcG proteins and paused Pol II states, these data identify a two-step mechanism of Hox-driven transcription, with M1BP binding leading to Pol II recruitment followed by AbdA targeting, which results in a change in the chromatin landscape and enhanced transcription.
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Affiliation(s)
- Amel Zouaz
- Aix Marseille Université, CNRS, IBDM, UMR 7288, Marseille, France
| | - Ankush Auradkar
- Aix Marseille Université, CNRS, IBDM, UMR 7288, Marseille, France
| | | | - Meiggie Macchi
- Aix Marseille Université, CNRS, IBDM, UMR 7288, Marseille, France
| | - Marine Barthez
- Aix Marseille Université, CNRS, IBDM, UMR 7288, Marseille, France
| | - Serge Ela Akoa
- Aix Marseille Université, CNRS, IBDM, UMR 7288, Marseille, France
| | - Leila Bastianelli
- MGX-Montpellier GenomiX c/o Institut de Génomique Fonctionnelle, Montpellier, France
| | - Gengqiang Xie
- Department of Biological Science, Florida State University, Tallahassee, FL, USA
| | - Wu-Min Deng
- Department of Biological Science, Florida State University, Tallahassee, FL, USA
| | - Stuart S Levine
- BioMicro Center, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Yacine Graba
- Aix Marseille Université, CNRS, IBDM, UMR 7288, Marseille, France
| | - Andrew J Saurin
- Aix Marseille Université, CNRS, IBDM, UMR 7288, Marseille, France
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