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Vinculin knockout results in heart and brain defects during embryonic development
W Xu1, H Baribault, E D Adamson
1The Burnham Institute, La Jolla, CA 92037, USA.
Development (Cambridge, England)
|March 5, 1998
Summary
Vinculin, a key cytoskeletal protein, is essential for embryonic development. Its absence causes severe defects in neural tube and heart formation, leading to embryonic lethality.
Area of Science:
- Cell Biology
- Developmental Biology
- Genetics
Background:
- Vinculin is a crucial cytoskeletal protein localized in focal adhesions and adherens junctions.
- It plays a significant role in cell adhesion, migration, and mechanical signal transduction.
Purpose of the Study:
- To investigate the essential role of vinculin in embryonic development.
- To elucidate the specific developmental defects and cellular behaviors affected by vinculin deficiency.
Main Methods:
- Homologous recombination was used to inactivate the vinculin gene in embryonic stem (ES) cells.
- Heterozygous ES cells were used to generate vinculin-deficient (vinculin-/-) mouse embryos for analysis.
- Cellular adhesion, migration, and focal adhesion kinase (FAK) activity were assessed in isolated fibroblasts.
Main Results:
- Homozygous vinculin-/- embryos exhibited severe developmental abnormalities and embryonic lethality between E8 and E10.
- Key defects included failed midline fusion of the rostral neural tube, impaired heart development, and retarded growth of somites and limbs.
- Vinculin-deficient fibroblasts showed reduced adhesion to extracellular matrix proteins, increased migration rates, and elevated FAK activity.
Conclusions:
- Vinculin is indispensable for normal embryonic development, likely due to its critical role in regulating cell adhesion and migration.
- Specific roles in neural tube and cardiac morphogenesis are highlighted, underscoring vinculin's broad importance in embryonic morphogenesis.