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First published online 3 May 2006
doi: 10.1242/dev.02386
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1 Department of Developmental and Molecular Biology, Albert Einstein College of
Medicine, Bronx, NY 10461, USA.
2 Division of Hematology/Oncology, Children's Hospital of Boston, Department of
Pediatrics, Howard Hughes Medical Institute, Harvard Medical School, Boston,
MA 02115, USA.
* Author for correspondence (e-mail: tevans{at}aecom.yu.edu)
Accepted 31 March 2006
The bone morphogenetic protein (BMP) signaling pathway is essential during gastrulation for the generation of ventral mesoderm, which makes it a challenge to define functions for this pathway at later stages of development. We have established an approach to disrupt BMP signaling specifically in lateral mesoderm during somitogenesis, by targeting a dominant-negative BMP receptor to Lmo2+ cells in developing zebrafish embryos. This results in expansion of hematopoietic and endothelial cells, while restricting the expression domain of the pronephric marker pax2.1. Expression of a constitutively active receptor and transplantation experiments were used to confirm that BMP signaling in lateral mesoderm restricts subsequent hemato-vascular development. The results show that the BMP signaling pathway continues to function after cells are committed to a lateral mesoderm fate, and influences subsequent lineage decisions by restricting hemato-vascular fate in favor of pronephric development.
Key words: Hematopoiesis, Endothelial, Pronephros, Transgenic, Zebrafish, lmo2
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