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The Master Regulator protein BAZ2B can reprogram human hematopoietic lineage-committed progenitors into a multipotent state

ABSTRACT: The Master Regulator protein BAZ2B can reprogram human hematopoietic lineage-committed progenitors into a multipotent state

PROVIDER: PRJNA470643 | ENA |

REPOSITORIES: ENA

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			Action	DRS
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	SRR11906965_1.fastq.gz	Fastqsanger.gz
	SRR11906965_2.fastq.gz	Fastqsanger.gz
	SRR11906966_1.fastq.gz	Fastqsanger.gz
	SRR11906966_2.fastq.gz	Fastqsanger.gz

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The Master Regulator Protein BAZ2B Can Reprogram Human Hematopoietic Lineage-Committed Progenitors into a Multipotent State.

Project description:Bi-species, fusion-mediated, somatic cell reprogramming allows precise, organism-specific tracking of unknown lineage drivers. The fusion of Tcf7l1-/- murine embryonic stem cells with EBV-transformed human B cell lymphocytes, leads to the generation of bi-species heterokaryons. Human mRNA transcript profiling at multiple time points permits the tracking of the reprogramming of B cell nuclei to a multipotent state. Interrogation of a human B cell regulatory network with gene expression signatures identifies 8 candidate master regulator proteins. Of these 8 candidates, ectopic expression of BAZ2B, from the bromodomain family, efficiently reprograms hematopoietic committed progenitors into a multipotent state and significantly enhances their long-term clonogenicity, stemness, and engraftment in immunocompromised mice. Unbiased systems biology approaches let us identify the early driving events of human B cell reprogramming.

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Project description:We report that Nup358, a nucleoporin linked to acute myeloid leukemia and myeloproliferative neoplasms, is required for the developmental progression of early myeloid progenitors. We found that loss of Nup358 in mice is associated with the accumulation of myeloid-primed multipotent progenitors (MPPs) in bone marrow and the loss of myeloid-committed progenitors and mature myeloid cells. Accumulated MPPs in Nup358 knockout mice are greatly restricted to megakaryocyte/erythrocyte biased MPP2 cells and fail to progress into committed myeloid progenitors.

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Project description:Self-renewal capacity is rapidly lost during differentiation of hematopoietic stem cells to lineage-committed progenitors. We demonstrate here that regulated intracellular signaling through the cytokine receptor Mpl induces profound expansion of not only multipotent (ie, lymphomyeloid) but also lymphoid-committed human hematopoietic progenitors. A fusion protein containing the intracellular signaling domain of Mpl and a dimerization domain was constitutively expressed in populations enriched in human lymphomyeloid progenitor/stem cells (CD34(+)CD38(-)Lin(-)CD7(-)) and multilymphoid progenitors (CD34(+)CD38(-)Lin(-)CD7(+)). Intracellular dimerization of Mpl in target cells was induced by in vitro or in vivo administration of a diffusible synthetic ligand. In vitro, Mpl dimerization produced divisions of clonogenic, multilineage CD34(+) cells able to engraft immunodeficient mice. When dimerization was induced in vivo after transplantation of either lymphomyeloid or multilymphoid progenitors, donor-derived hematopoiesis was sustained for at least 12 weeks and primitive CD34(+)Lin(-) progenitors were expanded more than 1000-fold. Lineage potential of progenitors was not altered and differentiation was not prevented by synthetically induced Mpl signaling. These data demonstrate that dimerization of a single cytokine receptor can deliver a profound expansion signal in both uncommitted and lymphoid-committed human hematopoietic progenitors.

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