Genetic complementation of cytokine signaling identifies central role of kinases in hematopoietic cell proliferation

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Abstract
Molecular evidence suggests a multistep process in the development of acute leukemia. Since inappropriate activation of cytokine signaling cascades is a recurring theme in human leukemia, we performed expression screens to identify genes that transform cytokine-dependent cells. Using retroviral cDNA libraries derived from peripheral blood mononuclear cells of patients with myeloproliferative disorders, we isolated numerous genes that genetically complement cytokine requirements for proliferation of BaF/3 and TF-1 cells. The majority of recovered genes represent members of the kinase family, including several previously linked to leukemogenesis. Our unbiased screen highlights the central role of kinase activation in hematopoietic cell proliferation and identifies a number of potential leukemic oncoproteins.