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Published on: February 2, 2016
Genetic interaction between Lef1 and Alx4 is required for early embryonic development
Kata Boras-Granic1, Rudolf Grosschedl, Paul A Hamel
1Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Canada.
The International Journal of Developmental Biology
|August 8, 2006
Summary
Lymphoid Enhancer Factor-1 (Lef1) and Aristaless-like 4 (Alx4) transcription factors are crucial for embryonic development. Their combined absence leads to embryonic lethality and severe defects in embryonic vasculature development.
Area of Science:
- Developmental biology
- Molecular genetics
- Vascular biology
Background:
- Lymphoid Enhancer Factor-1 (Lef1) is a transcription factor involved in Wnt signaling pathways.
- Aristaless-like 4 (Alx4) is a homeodomain protein that interacts with Lef1.
- Previous studies indicated Lef1 and Alx4 alter gene promoter activity.
Purpose of the Study:
- To define the overlapping functions of Lef1 and Alx4.
- To investigate the consequences of combined Lef1 and Alx4 deficiency during embryonic development.
Main Methods:
- Generation of double knockout mice deficient for both Lef1 and Alx4 (Lef1-/-/Alx4lstD/lstD).
- Embryonic staging and viability assessment.
- Vascular network analysis using Platelet/endothelial cell adhesion molecule (PECAM) staining.
Main Results:
- Lef1-/-/Alx4lstD/lstD embryos exhibit early embryonic lethality, with no viable embryos recovered beyond 9.5 days post-coitum (dpc).
- Compound mutant embryos showed developmental delay and defective vasculature, including diminished vascular networks in the yolk sac and absence of major head vessels.
- Presence of blood and pericardial effusion indicated compromised vascular integrity.
Conclusions:
- Genetic deficiency of both Lef1 and Alx4 results in embryonic lethality, confirming their interaction.
- Lef1 and Alx4 play essential, overlapping roles in embryonic vasculogenesis and vascular integrity.
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