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Reversibility of acute B-cell leukaemia induced by BCRABL1

Abstract

Cancer is thought to arise from multiple genetic events that establish irreversible malignancy. A different mechanism might be present in certain leukaemias initiated by a chromosomal translocation. We have taken a new approach to determine if ablation of the genetic abnormality is sufficient for reversion by generating a conditional transgenic model of BCRABL1 (also known as BCRABL)-induced leukaemia. This oncogene1 is the result of a reciprocal translocation and is associated with different forms of leukaemia2. The most common form, p210 BCRABL1, is found in more than 90% of patients with chronic myelogenous leukaemia3,4 (CML) and in up to 15% of adult patients with de novoacute lymphoblastic leukaemia5 (ALL). Efforts to establish a useful transgenic model have been hampered by embryonic lethality when the oncogene is expressed during embryogenesis6,7, by reduced penetrance or by extremely long latency periods8,9. One model uses the ‘knock-in’ approach to induce leukaemia by p190 BCRABL1(ref. 10). Given the limitations of models with p210, we used a different experimental approach11. Lethal leukaemia developed within an acceptable time frame in all animals, and complete remission was achieved by suppression of BCRABL1expression, even after multiple rounds of induction and reversion. Our results demonstrate that BCRABL1is required for both induction and maintenance of leukaemia.

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Figure 1: Induction of leukaemia by BCRABL1 under the control of the ‘tet-off’ system in transgenic mice.
Figure 2: Expression of BCRABL1 induces an acute pre-B cell leukaemia.
Figure 3: Analysis of immunoglobulin rearrangements and p210 protein expression in mice from different founder lines with B-cell ALL.
Figure 4: The leukaemic phenotype is reversibly dependent on the continuous expression of BCRABL1.
Figure 5: Apoptosis of leukaemic cells in peripheral blood following re-administration of tetracycline.

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Acknowledgements

We thank M. Fenyus for assistance in animal care; L. Hennighausen for providing the MMTV-tTA strain; J. Lawitts of the BIDMC transgenic facility for expert rederivation and generation of transgenic lines; S. Takamatsu for assistance with photography; M. Singleton for assistance with preparation of the manuscript; and J.D. Griffin, G. Gilliland, D.-E. Zhang, K.P. Lu, C. Carpenter and L.K. Clayton for useful discussions. This work was supported by grants from the NIH to D.G.T., research grants from the NIH and the Leukemia Society of America to R.A.V. and from the Deutsche Forschungsgemeinschaft to C.S.H.

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Correspondence to Daniel G. Tenen.

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Huettner, C., Zhang, P., Van Etten, R. et al. Reversibility of acute B-cell leukaemia induced by BCRABL1. Nat Genet 24, 57–60 (2000). https://doi.org/10.1038/71691

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