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Dosage-dependent requirement for mouse Vezf1 in vascular system development
Frank Kuhnert1, Luisa Campagnolo, Jing-Wei Xiong
1Department of Cell Biology, Division of Vascular Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.
Developmental Biology
|May 11, 2005
Summary
Vezf1, an early development gene, is crucial for blood and lymphatic system formation. Its absence causes vascular defects, while partial loss leads to lymphatic malformations similar to human cystic hygroma.
Area of Science:
- Developmental biology
- Vascular biology
- Genetics
Background:
- Vezf1 (VEZF1) encodes a zinc finger transcription factor vital for early embryonic development.
- Vezf1 expression is observed in embryonic tissues, including yolk sac mesoderm, vasculature endothelium, and neuronal tissues.
Purpose of the Study:
- To investigate the role of Vezf1 in the development of the blood vascular and lymphatic systems.
- To elucidate the consequences of Vezf1 gene inactivation on embryonic vascular integrity and lymphatic development.
Main Methods:
- Targeted gene inactivation of Vezf1 in mouse models.
- Phenotypic analysis of homozygous and heterozygous mutant embryos.
- Ultrastructural analysis of endothelial cell adhesion and tight junctions.
Main Results:
- Homozygous Vezf1 inactivation resulted in severe vascular remodeling defects, loss of integrity, and hemorrhaging.
- Ultrastructural examination revealed impaired endothelial cell adhesion and tight junction formation in mutant vessels.
- Heterozygous embryos exhibited haploinsufficiency, leading to lymphatic hypervascularization, hemorrhaging, and edema, mimicking cystic hygroma.
Conclusions:
- Vezf1 plays a critical, dose-dependent role in regulating vascular and lymphatic development.
- Vezf1 deficiency disrupts endothelial cell function, impacting vascular integrity.
- Vezf1 haploinsufficiency provides a model for human lymphatic malformations like cystic hygroma.