Abstract
Aberrant expression of homeobox genes has been described in primary leukemia blasts. We recently cloned a new cDNA, BP1, which is a member of the homeobox gene family. BP1 expression was investigated in bone marrow samples from acute myeloid leukemia (AML), acute T cell lymphocytic leukemia (ALL) and pre-B cell ALL. Expression levels of two apparent isoforms of BP1, DLX7 and DLX4, were measured in the same samples. They are weakly if at all detectable in normal bone marrow, PHA-stimulated T cells or B cells. BP1 RNA was highly expressed in 63% of AML cases, including 81% of the pediatric and 47% of the adult cases, and in 32% of T-ALL cases, but was not found in any of the pre-B ALL cases. Co-expression of BP1, DLX7 and DLX4 occurred in a significant number of leukemias. Our data, including co-expression of BP1 with c-myb and GATA-1, markers of early progenitors, suggest that BP1 expression occurs in primitive cells in AML. Analysis of CD34+ and CD34− normal bone marrow cells revealed BP1 is expressed in CD34− cells and virtually extinguished in CD34+ cells. Ectopic expression of BP1 in the leukemia cell line K562 increased clonogenicity, consistent with a role for BP1 in leukemogenesis. The presence of BP1 RNA in leukemic blasts may therefore be a molecular marker for primitive cells and/or may indicate that BP1 is an important upstream factor in an oncogenic pathway.
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Acknowledgements
We thank Dr Valerie Hu for helpful comments on the manuscript. This work was supported in part by grants from the Elsa U Pardee Foundation (PEB), National Institutes of Health Grant R01 DK53533 (PEB), NIH CA-21765 (FB and SCR), and by the American Lebanese Syrian Associated Charities (ALSAC) (FB and SCR). Procurement and processing of some leukemia samples was supported by National Institutes of Health Grant 5P30CA06973 (BDS).
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Haga, S., Fu, S., Karp, J. et al. BP1, a new homeobox gene, is frequently expressed in acute leukemias. Leukemia 14, 1867–1875 (2000). https://doi.org/10.1038/sj.leu.2401912
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DOI: https://doi.org/10.1038/sj.leu.2401912
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