Abstract
The oncogenic fusion protein AML1-ETO, also known as RUNX1-RUNX1T1 is generated by the t(8;21)(q22;q22) translocation, one of the most frequent chromosomal rearrangements in acute myeloid leukemia (AML). Identifying the genes that cooperate with or are required for the oncogenic activity of this chimeric transcription factor remains a major challenge. Our previous studies showed that Drosophila provides a genuine model to study how AML1-ETO promotes leukemia. Here, using an in vivo RNA interference screen for suppressors of AML1-ETO activity, we identified pontin/RUVBL1 as a gene required for AML1-ETO-induced lethality and blood cell proliferation in Drosophila. We further show that PONTIN inhibition strongly impaired the growth of human t(8;21)+ or AML1-ETO-expressing leukemic blood cells. Interestingly, AML1-ETO promoted the transcription of PONTIN. Moreover, transcriptome analysis in Kasumi-1 cells revealed a strong correlation between PONTIN and AML1-ETO gene signatures and demonstrated that PONTIN chiefly regulated the expression of genes implicated in cell cycle progression. Concordantly, PONTIN depletion inhibited leukemic self-renewal and caused cell cycle arrest. All together our data suggest that the upregulation of PONTIN by AML1-ETO participate in the oncogenic growth of t(8;21) cells.
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Acknowledgements
We are grateful to members of our teams for comments on the manuscript. We thank Toulouse RIO imaging platform and T Jungas for assistance with FACS analysis as well as L Liaubet and S Bel-Vialar for their help with microarray analysis. We deeply thank B Augé for technical help. We thank the National Institute of Genetics (Japan), the Vienna Drosophila Resource Center (Austria) and Bloomington (USA) for fly stocks. This work was supported by grants from the Ligue Régionale Midi Pyrénées, Fondation ARC and Association for International Cancer Research to LW and OB; SB was supported by a fellowship from the Fondation pour la Recherche Médicale, and OH and NMS by a research grant from Leukaemia and Lymphoma Research (10033).
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Breig, O., Bras, S., Martinez Soria, N. et al. Pontin is a critical regulator for AML1-ETO-induced leukemia. Leukemia 28, 1271–1279 (2014). https://doi.org/10.1038/leu.2013.376
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DOI: https://doi.org/10.1038/leu.2013.376
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