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Updated: May 12, 2026
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Structure-function Studies in Mouse Embryonic Stem Cells Using Recombinase-mediated Cassette Exchange
Published on: April 27, 2017
Etv2 rescues Flk1 mutant embryoid bodies
Tara L Rasmussen1, Cindy M Martin, Camille A Walter
1Department of Medicine, Cardiovascular Division, and Lillehei Heart Institute, University of Minnesota, Minneapolis, MN, USA.
Genesis (New York, N.Y. : 2000)
|April 23, 2013
Summary
Flk1 and Etv2 are crucial for embryonic development. Overexpressing Etv2 can rescue developmental defects in Flk1 mutant cells, suggesting Etv2 disruption causes early embryonic lethality in these models.
Area of Science:
- Developmental biology
- Stem cell research
- Hematopoiesis and vasculogenesis
Background:
- Etv2 and Flk1 (fetal liver kinase 1) are essential for embryonic development, with independent knockouts leading to embryonic lethality.
- Flk1 activates Etv2 during the initiation of hematopoiesis and vasculogenesis.
- While Flk1 and VEGF are expressed throughout development, Etv2 expression is transient, suggesting a complex regulatory relationship.
Purpose of the Study:
- To investigate the intricate regulatory interaction between Flk1 and Etv2.
- To determine the role of Etv2 in the developmental defects observed in Flk1 and Etv2 mutant embryos.
Main Methods:
- Utilized induced overexpression of Etv2 or Flk1 in Etv2 and Flk1 mutant mouse embryonic stem (ES) cells.
- Employed viral integrants for inducible gene expression to rescue mutant phenotypes.
Main Results:
- Forced expression of Etv2 successfully rescued the hematopoietic and endothelial potential in both Flk1 and Etv2 mutant ES cells.
- Forced expression of Flk1 rescued the Flk1 mutant cells but not the Etv2 mutant cells.
- These findings indicate that Etv2 is downstream of Flk1 in this developmental pathway.
Conclusions:
- The requirement for Flk1 in early development can be bypassed by the expression of Etv2.
- Disruption of Etv2 expression is the primary cause of the early embryonic lethality observed in Etv2 and Flk1 mutant embryos.
