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Nodal activity in the node governs left-right asymmetry
Jane Brennan1, Dominic P Norris, Elizabeth J Robertson
1Department of Molecular and Cellular Biology, Harvard University, The Biological Laboratories, Cambridge, Massachusetts 02138, USA.
Genes & Development
|September 17, 2002
Summary
Nodal is crucial for initiating left-right axis formation in mice. Removing Nodal from the node causes severe developmental defects, confirming its role in embryonic patterning.
Area of Science:
- Developmental biology
- Embryology
- Genetics
Background:
- Nodal expression at the mouse node's lateral edges is known, but its precise function is unclear.
- Early lethality of Nodal mutant embryos has hindered functional studies in the node.
- The node acts as an "organizer" tissue in early mouse development.
Purpose of the Study:
- To investigate the function of Nodal specifically within the mouse node.
- To understand Nodal's role in initiating molecular asymmetry and left-right patterning.
- To determine if Nodal acts as a short-range signal for midline barrier formation.
Main Methods:
- Utilized a genetic strategy to selectively eliminate Nodal activity within the node.
- Observed and analyzed developmental defects in embryos with targeted Nodal removal.
- Assessed molecular asymmetry in the left lateral plate mesoderm.
Main Results:
- Embryos lacking Nodal in the node failed to establish molecular asymmetry in the left lateral plate mesoderm.
- Significant left-right patterning defects were observed in these embryos.
- Evidence suggests Nodal may function as a short-range signal for midline barrier establishment.
Conclusions:
- The mouse node is essential for initiating left-right axis specification.
- Nodal is identified as the key morphogen regulating this critical developmental process.
- Nodal's function in the node is vital for correct embryonic patterning and organ development.