Abstract
Activation of the basic helix–loop–helix (bHLH) gene TAL-1 (or SCL) is the most frequent gain-of-function mutation in pediatric T cell acute lymphoblastic leukemia (T-ALL). Similarly, mis-expression of tal-1 in the thymus of transgenic mice results in the development of clonal T cell lymphoblastic leukemia. To determine the mechanism(s) of tal-1-induced leukemogenesis, we created transgenic mice expressing a DNA binding mutant of tal-1. Surprisingly, these mice develop disease, demonstrating that the DNA binding properties of tal-1 are not required to induce leukemia/lymphoma in mice. However, wild type tal-1 and the DNA binding mutant both form stable complexes with E2A proteins. In addition, tal-1 stimulates differentiation of CD8-single positive thymocytes but inhibits the development of CD4-single positive cells: effects also observed in E2A-deficient mice. Our study suggests that the bHLH protein tal-1 contributes to leukemia by interfering with E2A protein function(s).
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Acknowledgements
The authors would like to acknowledge the expert technical assistance of the University of Massachusetts Medical School Transgenic Mouse Core Facility. M Kelliher is a recipient of a Sidney Kimmel Cancer Scholar Award.
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O'Neil, J., Billa, M., Oikemus, S. et al. The DNA binding activity of TAL-1 is not required to induce leukemia/lymphoma in mice. Oncogene 20, 3897–3905 (2001). https://doi.org/10.1038/sj.onc.1204519
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DOI: https://doi.org/10.1038/sj.onc.1204519
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