Notochord Morphogenesis and Cellular Mechanisms
Summary
The notochord is a defining axial structure of chordate embryos, serving both as a mechanical scaffold and a signalling centre that patterns surrounding tissues. Its formation involves a coordinated series of cell-level events, including the convergence and extension of precursor cells into a coherent rod, elongation of individual notochord cells, establishment of planar and apical–basal polarity, and the generation of a central lumen. Underlying these morphogenetic steps are dynamic rearrangements of the actomyosin cytoskeleton, regulated trafficking of vesicles to the apical membrane and deposition of specialised extracellular matrix. Comparative studies across ascidians, amphioxus and vertebrates reveal both conserved and lineage-specific implementations of these cellular programmes. Understanding notochord morphogenesis illuminates fundamental principles of tissue elongation, lumenogenesis and the interplay between biochemical signalling and mechanical forces, with implications for congenital vertebral malformations and bioengineering of tubular organs.
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Notochord Morphogenesis and Cellular Mechanisms publication trend
The graph below shows the total number of articles in notochord morphogenesis and cellular mechanisms across all publications each year (not limited to Nature Index journals).
Technical terms
Convergent extension: A cell rearrangement process in which cells intercalate mediolaterally to narrow a tissue and elongate it along the anterior–posterior axis.
Planar cell polarity: Coordinated orientation of cells within the plane of an epithelial sheet, directing directional behaviours such as intercalation and asymmetric contractility.
Apical–basal polarity: The asymmetric organisation of cellular components between the apical (lumen-facing) and basal (extracellular matrix-facing) surfaces of epithelial cells.
Lumenogenesis: The formation and expansion of a central cavity within a tubular tissue, driven by coordinated trafficking, cell polarity and fluid transport.
Extracellular matrix: A network of secreted proteins and polysaccharides that provides structural support, transmits mechanical forces and modulates cell signalling during morphogenesis.
References
- ELMOD3-Rab1A-Flotillin2 cascade regulates lumen formation via vesicle trafficking in Ciona notochord. Open Biology (2023).
- Single-cell morphometrics reveals ancestral principles of notochord development. Development (2021).
- Nuclear Factor of Activated T Cells-5 Regulates Notochord Lumenogenesis in Chordate Larval Development. International Journal of Molecular Sciences (2022).
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