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Thirant, Cécile; Ignacimouttou, Cathy; Lopez, Cécile K.; Diop, M’Boyba; Le Mouël, Lou; Thiollier, Clarisse; Siret, Aurélie; Dessen, Phillipe; Aid, Zakia; Rivière, Julie; Rameau, Philippe; Lefebvre, Céline; Khaled, Mehdi; Leverger, Guy; Ballerini, Paola; Petit, Arnaud; Raslova, Hana; Carmichael, Catherine L.; Kile, Benjamin T.; Soler, Eric; Crispino, John D.; Wichmann, Christian; Pflumio, Françoise; Schwaller, Jürg; Vainchenker, William; Lobry, Camille; Droin, Nathalie; Bernard, Olivier A.; Malinge, Sébastien; Mercher, Thomas
Cancer cell, 03/2017, Letnik: 31, Številka: 3Journal Article
Chimeric transcription factors are a hallmark of human leukemia, but the molecular mechanisms by which they block differentiation and promote aberrant self-renewal remain unclear. Here, we demonstrate that the ETO2-GLIS2 fusion oncoprotein, which is found in aggressive acute megakaryoblastic leukemia, confers megakaryocytic identity via the GLIS2 moiety while both ETO2 and GLIS2 domains are required to drive increased self-renewal properties. ETO2-GLIS2 directly binds DNA to control transcription of associated genes by upregulation of expression and interaction with the ETS-related ERG protein at enhancer elements. Importantly, specific interference with ETO2-GLIS2 oligomerization reverses the transcriptional activation at enhancers and promotes megakaryocytic differentiation, providing a relevant interface to target in this poor-prognosis pediatric leukemia. Display omitted •The GLIS2 moiety of ETO2-GLIS2 oncoprotein controls the megakaryocytic identity•Human AMKL oncogenes often cause GATA/ETS functional imbalance•ETO2-GLIS2 binds enhancer regions together with the ERG transcription factor•The NHR2 interface is essential for maintenance of ETO2-GLIS2-driven leukemia Thirant et al. show that the ETO2-GLIS2 fusion protein found in acute megakaryoblastic leukemia confers megakaryocytic identity via the GLIS2 moiety, but requires both ETO2 and GLIS2 domains to drive self-renewal. Disruption of ETO2-GLIS2 oligomerization inhibits the maintenance of ETO2-GLIS2+ human AMKL blasts.
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in: SICRIS
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