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The changes in signal transduction associated with the acquisition of specific cell fates remain poorly understood. We performed massive parallel assessment of kinase signatures of the radiations of the hematopoietic system, including long-term repopulating hematopoietic stem cells (LT-HSC), short-term repopulating HSC (ST-HSC), immature natural killer (iNK) cells, NK cells, B cells, T cells, and myeloid cells. The LT-HSC kinome is characterized by noncanonical Wnt, Ca(2+) and classical protein kinase C (PKC)-driven signaling, which is lost upon the transition to ST-HSC, whose kinome signature prominently features receptor tyrosine kinase (RTK) activation of the Ras/MAPK signaling cassette. Further differentiation to iNK maintains signaling through this cassette but simultaneously leads to activation of a PI3K/PKB/Rac signaling, which becomes the dominant trait in the kinase signature following full differentiation toward NK cells. Differentiation along the myeloid and B cell lineages is accompanied by hyperactivation of both the Ras/MAPK and PI3K/PKB/Rac signaling cassette. T cells, however, deactivate signaling and only display residual G protein-coupled pathways. Thus, differentiation along the hematopoietic lineage is associated with major remodelling of cellular kinase signature.

Major Remodelling of the Murine Stem Cell Kinome Following Differentiation in the Hematopoietic Compartment