Abstract
Approximately 25% of childhood B-cell precursor acute lymphoblastic leukemia have an ETV6/RUNX1 (E/R) gene fusion that results from a t(12;21). This genetic subgroup of leukemia is associated with near-triploidy, near-tetraploidy, and trisomy 21 as rather specific types of secondary changes. Here, we show that, unlike various controls, E/R-expressing Ba/F3 clones acquire a tetraploid karyotype on prolonged culture, corroborating the assumption that E/R may attenuate the mitotic checkpoint (MC). Consistent with this notion, E/R-expressing diploid murine and human cell lines have decreased proportions of cells with 4N DNA content and a lower mitotic index when treated with spindle toxins. Moreover, both RUNX1 and E/R regulate mitotic arrest-deficient 2 L1 (MAD2L1), an essential MC component, by binding to promoter-inherent RUNX1 sites, which results in down-regulation of MAD2L1 mRNA and protein in E/R-expressing cells. Forced expression of E/R also abolishes RUNX1-induced reporter activation, whereas E/R with a mutant DNA-binding site leads to only minor effects. Our data link for the first time E/R, MC, and MAD2L1 and provide new insights into the function of the E/R fusion gene product. Although tetraploidy is an almost exclusive feature of E/R-positive leukemias, its rarity within this particular subgroup implies that further yet unknown factors are required for its manifestation.
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Acknowledgements
We thank O Williams for expression vectors containing E/R or the mutant E/R, D-E Zhang for the RUNX1-expression vector, A Friedman for CBFβ-expression vector, D Guardavaccaro for the luciferase reporter plasmid for the MAD2L1 promoter in pGL3, JD Rowley for AT-2 cell line, L Orel for the Myc-ETV6/RUNX1 vector, Idriss M Bennani-Baiti for stimulating discussions, and Marion Zavadil for proofreading the paper. This study was supported in part by a grant from the FWF P17551-B14 and the Austrian Ministry for Education, Science and Culture (GENAU-Ch.I.L.D) and the St Anna Kinderkrebsforschung to ER P-G. A Kilbey is funded by the Leukaemia Research Fund. GK participated in the design of the study, performed experiments, interpreted data, and wrote the paper. UK, GF, AI, RJ performed research and interpreted data. AK performed and interpreted ChIP experiments. JCN participated in study design and interpretation of ChIP data. GM contributed patient samples. OAH participated in the interpretation of data and writing of the paper. ER P-G designed and supervised research and wrote the paper.
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Krapf, G., Kaindl, U., Kilbey, A. et al. ETV6/RUNX1 abrogates mitotic checkpoint function and targets its key player MAD2L1. Oncogene 29, 3307–3312 (2010). https://doi.org/10.1038/onc.2010.53
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DOI: https://doi.org/10.1038/onc.2010.53
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