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Blood cell formation is a tightly regulated process initiated from a rare population of multipotent hematopoietic stem cells. Subsequent differentiation proceeds in a hierarchical manner with the generation of intermediate progenitor cells, in which alternative lineage potentials become gradually restricted. A deeper understanding of these events is crucial not only to understand normal blood cell formation, but also for leukemia, where a defining feature is inappropriate differentiation. Here, we identified Hepatic Leukemia Factor (Hlf) as being highly and selectively expressed in primitive multipotent hematopoietic stem and progenitors. We demonstrate that Hlf is a strong negative regulator of B-, NK- and T cell development and instructs multipotent progenitors to adopt a myeloid fate in a cell autonomous manner; phenotypes underwritten by the induction of myeloid affiliated transcriptional programs, the concomitant ablation of lymphoid gene programs and a genome-wide binding spectra that involved active enhancers of myeloid-competent cells. Collectively, our studies establish Hlf as a key regulator of the earliest lineage-commitment events at the transition from multipotency to lineage-restricted progeny, with implications for both normal and malignant hematopoiesis. Gene expression profiling of control or Hlf/Hlf lentivirus infected GMLPs (2 replicates per group) and Hlf inducible GMLPs maintained for 4 days on OP9 stroma in the presence or absence of doxycycline (2 replicates per group)

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