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AML-1 is required for megakaryocytic maturation and lymphocytic differentiation, but not for maintenance of hematopoietic stem cells in adult hematopoiesis

An Erratum to this article was published on 01 January 2005

Abstract

Embryonic development of multilineage hematopoiesis requires the precisely regulated expression of lineage-specific transcription factors, including AML-1 (encoded by Runx1; also known as CBFA-2 or PEBP-2αB)1,2,3,4,5. In vitro studies and findings in human diseases, including leukemias6,7, myelodysplastic syndromes8 and familial platelet disorder with predisposition to acute myeloid leukemia (AML)9, suggest that AML-1 has a pivotal role in adult hematopoiesis. However, this role has not been fully uncovered in vivo because of the embryonic lethality of Runx1 knockout in mice. Here we assess the requirement of AML-1/Runx1 in adult hematopoiesis using an inducible gene-targeting method10. In the absence of AML-1, hematopoietic progenitors were fully maintained with normal myeloid cell development. However, AML-1-deficient bone marrow showed inhibition of megakaryocytic maturation, increased hematopoietic progenitor cells and defective T- and B-lymphocyte development. AML-1 is thus required for maturation of megakaryocytes and differentiation of T and B cells, but not for maintenance of hematopoietic stem cells (HSCs) in adult hematopoiesis.

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Figure 1: Inducible AML-1 knockout mice.
Figure 2: Thrombocytopenia and megakaryocytic maturation arrest of induced AML-1 knockout mice.
Figure 3: Hematopoietic progenitor cells are expanded in floxed bone marrow.
Figure 4: Competitive repopulation assay.

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Acknowledgements

We thank S. Aizawa for providing us with TT2 ES cells; T. Komori for Runx1 genomic fragments; J. Takeda for Mx-cre-transgenic mice; and thank K. Kumano, A. Kunisato and other members of H.H.'s lab for critical discussion. This work was supported in part by a Grant-in-Aid for Scientific Research (KAKENHI 13307029, 15689015) from the Japan Society for the Promotion of Science, and by Health and Labour Sciences Research grants from the Ministry of Health, Labour and Welfare.

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Correspondence to Seishi Ogawa.

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Ichikawa, M., Asai, T., Saito, T. et al. AML-1 is required for megakaryocytic maturation and lymphocytic differentiation, but not for maintenance of hematopoietic stem cells in adult hematopoiesis. Nat Med 10, 299–304 (2004). https://doi.org/10.1038/nm997

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