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Prepublished online as a Blood First Edition Paper on April 17, 2002; DOI 10.1182/blood-2001-12-0321.

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Blood, 15 July 2002, Vol. 100, No. 2, pp. 458-466

HEMATOPOIESIS

Runx1 is essential for hematopoietic commitment at the hemangioblast stage of development in vitro

Georges Lacaud, Lia Gore, Marion Kennedy, Valerie Kouskoff, Paul Kingsley, Christopher Hogan, Leif Carlsson, Nancy Speck, James Palis, and Gordon Keller

From the Carl C. Icahn Institute for Gene Therapy and Molecular Medicine, Mount Sinai School of Medicine, New York, NY; Department of Pediatrics, Division of Hematology-Oncology, and the Division of Medical Oncology, University of Colorado Health Sciences Center and Children's Hospital, Denver; Department of Pediatrics and the Center for Human Genetics and Molecular Pediatric Disease, University of Rochester, NY; Department of Molecular Biology, Umeå University, Sweden; and Department of Biochemistry, Dartmouth Medical School, Hanover, NH.

In this report we demonstrate a role for Runx1 (AML1) at the hemangioblast stage of hematopoietic and endothelial development in embryonic stem (ES) cell-derived embryoid bodies (EBs). Runx1 is expressed in EBs during the appearance of precursors with hemangioblast properties, the blast colony-forming cells (BL-CFCs). Cell sorting studies revealed that all BL-CFCs within EBs express Runx1. Runx1-deficient EBs consistently generate 10- to 20-fold fewer blast colonies than wild-type controls and display a complete block in definitive hematopoiesis. Despite this defect, Runx1-/- EBs and yolk sacs from mutant embryos generate normal numbers of primitive erythroid precursors. These observations clearly demonstrate that Runx1 functions early in hematopoietic development, and they support the interpretation that the primitive erythroid lineage is established early by a subset of BL-CFCs that develop in a Runx1-independent fashion.

© 2002 by The American Society of Hematology.
 

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