Abstract
The CALM/AF10 fusion gene is found in various hematological malignancies including acute myeloid leukemia (AML), T-cell acute lymphoblastic leukemia and malignant lymphoma. We have previously identified the leukemia stem cell (LSC) in a CALM/AF10-driven murine bone marrow transplant AML model as B220+ lymphoid cells with B-cell characteristics. To identify the target cell for leukemic transformation or ‘cell of origin of leukemia’ (COL) in non-disturbed steady-state hematopoiesis, we inserted the CALM/AF10 fusion gene preceded by a loxP-flanked transcriptional stop cassette into the Rosa26 locus. Vav-Cre-induced panhematopoietic expression of the CALM/AF10 fusion gene led to acute leukemia with a median latency of 12 months. Mice expressing CALM/AF10 in the B-lymphoid compartment using Mb1-Cre or CD19-Cre inducer lines did not develop leukemia. Leukemias had a predominantly myeloid phenotype but showed coexpression of the B-cell marker B220, and had clonal B-cell receptor rearrangements. Using whole-exome sequencing, we identified an average of two to three additional mutations per leukemia, including activating mutations in known oncogenes such as FLT3 and PTPN11. Our results show that the COL for CALM/AF10 leukemia is a stem or early progenitor cell and not a cell of B-cell lineage with a phenotype similar to that of the LSC in CALM/AF10+ leukemia.
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Acknowledgements
We thank Frank Constantini from Columbia University, USA, for kindly providing the pBigT and Rosa26PA vectors, to Dimitris Kioussis from MRC National Institute for Medical Research, UK, and Matthias Kieslinger from Helmholtz Zentrum München, Germany, for the Vav-Cre mouse line, to Elias Hobeika and Michael Reth, both from MPI Freiburg, Germany, for the mb1Cre mouse line (referred to as Mb1-Cre in this manuscript), and to Klaus Rajewsky from MDC Berlin, Germany, for the CD19-Cre mouse line. This work was supported by Deutsche Forschungsgemeinschaft Grants to SKB, EW, KS and UZ (SFB 684 A6, A12 and A13). SKB and MC are supported by Leukemia and Blood Cancer New Zealand and the family of Marijanna Kumerich.
Author contributions
SD and SKB designed the experiments. SD and BT performed experiments. AK, MRS and MD generated the knock-in R26LSLCA mouse line, and EW supervised this work. SV and PAG analyzed WES data. TH analyzed GEP data. BK performed the FACS sorting. LQM performed histology and IHC. SKB, AG and HB operated the sequencing platform. SK performed the sequencing experiments. KS contributed to the manuscript. UZS supervised the animal experiments. AV, KM and MR-T performed and analyzed the gene panel sequencing. SD, MC and SKB analyzed data and wrote the manuscript. SKB supervised the project.
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Dutta, S., Krause, A., Vosberg, S. et al. The target cell of transformation is distinct from the leukemia stem cell in murine CALM/AF10 leukemia models. Leukemia 30, 1166–1176 (2016). https://doi.org/10.1038/leu.2015.349
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DOI: https://doi.org/10.1038/leu.2015.349