Impaired embryonic haematopoiesis yet normal arterial development in the absence of the Notch ligand Jagged1

A Robert-Moreno, J Guiu, C Ruiz-Herguido, ME Lopez, J Ingles-Esteve, L Riera, A Tipping, T Enver, Elaine Dzierzak, T Gridley, L Espinosa, A Bigas

Research output: Contribution to journalArticleAcademicpeer-review

161 Citations (Scopus)

Abstract

Specific deletion of Notch1 and RBPjk in the mouse results in abrogation of definitive haematopoiesis concomitant with the loss of arterial identity at embryonic stage. As prior arterial determination is likely to be required for the generation of embryonic haematopoiesis, it is difficult to establish the specific haematopoietic role of Notch in these mutants. By analysing different Notch-ligand-null embryos, we now show that Jagged1 is not required for the establishment of the arterial fate but it is required for the correct execution of the definitive haematopoietic programme, including expression of GATA2 in the dorsal aorta. Moreover, successful haematopoietic rescue of the Jagged1-null AGM cells was obtained by culturing them with Jagged1-expressing stromal cells or by lentiviral-mediated transduction of the GATA2 gene. Taken together, our results indicate that Jagged1-mediated activation of Notch1 is responsible for regulating GATA2 expression in the AGM, which in turn is essential for definitive haematopoiesis in the mouse.
Original languageUndefined/Unknown
Pages (from-to)1886-1895
Number of pages10
JournalEMBO Journal
Volume27
Issue number13
DOIs
Publication statusPublished - 2008

Research programs

  • EMC MGC-02-13-03

Cite this