Key Points
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Spatial, temporal and mechanical cues control gene expression and protein activity that regulate force production and mechanical tissue responses in embryos. It is not well understood how mechanical cues determine cell fate or alter gene expression.
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Various experiments have aimed to understand the role of mechanically activated cell signalling during morphogenesis. Molecular and genetic manipulations have been used, along with analyses of the spatial and temporal mechanisms that transmit and coordinate forces in the tissue. In vivo and in vitro studies have identified the roles of biomechanical cues in guiding cell fate and behaviour.
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Recent experiments have shown that cellular mechanosensing is broken down into mechanical signals from the microenvironment of the cell and from the plasma membrane and cell cortex. These signals might alter the activity of transcription factors through cell signalling.
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Mechanical signals have been shown to have a role in complex and poorly understood feedback loops that underlie the robust programmes of development.
Abstract
Force production and the propagation of stress and strain within embryos and organisms are crucial physical processes that direct morphogenesis. In addition, there is mounting evidence that biomechanical cues created by these processes guide cell behaviours and cell fates. In this Review we discuss key roles for biomechanics during development to directly shape tissues, to provide positional information for cell fate decisions and to enable robust programmes of development. Several recently identified molecular mechanisms suggest how cells and tissues might coordinate their responses to biomechanical cues. Finally, we outline long-term challenges in integrating biomechanics with genetic analysis of developing embryos.
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Acknowledgements
The authors would like to thank members of the Davidson laboratory for their support and ongoing discussions on the role of mechanics in development. This work was supported by the National Science Foundation (IOS-0845775, LAD and CJM) and the US National Institutes of Health (HD044750 and ES019259, L.A.D.; 2T32EB003392, C.J.M.).
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Glossary
- Gastrulation
-
Stage of embryonic development when large cell rearrangements occur and the three germ layers — endoderm, mesoderm and ectoderm — of the embryo are established.
- Vegetal plate
-
The columnar epithelium at the vegetal pole of an echinoderm embryo. The thickened vegetal plate forms a pocket and tube by invagination during gastrulation to form the archenteron, or primitive gut, of the embryo.
- Blastula
-
The early stage of a developing embryo after rapid cell divisions have created a sphere, sometimes hollow, of many cells.
- Ectoderm
-
The outermost germ layer of the embryo. Cells from this layer differentiate into skin and neural tissues.
- Dorsal closure
-
A step in Drosophila melanogaster development in which the epidermis closes over the exposed amnioserosa.
- Amnioserosa
-
A layer of epithelial cells that covers dorsal regions of the early Drosophila melanogaster embryo.
- Epidermis
-
The outermost epithelial layer of an embryo.
- Anterior
-
The axis of the embryo defined by the tissues fated to form the head.
- Posterior
-
The axis of the embryo defined by the tissues fated to form the tail.
- Invagination
-
The 'in-folding' of an epithelium.
- Apical
-
Surfaces that face the 'outside' or lumen.
- Basal
-
Surfaces that face in the opposite direction to apical surfaces; that is, away from the 'outside'.
- Traction force microscopy
-
A method used to determine the force that a cell or tissue exerts on a substrate to which it is adhered.
- Focal adhesion complex
-
A dynamic protein complex that connects the cytoskeleton of the cell to the extracellular matrix.
- Desmosomes
-
A spot-like junctional complex for cell–cell adhesion that is distinct from adherens junctions (which connect epithelial cells to neighbours at their apical ends).
- Cell cortex
-
A layer of cytoplasm just inside the plasma membrane. Cytoskeletal proteins in the cell cortex maintain the shape of the cell.
- Stomodeal primordium
-
A tissue fated to give rise to the Drosophila melanogaster foregut.
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Miller, C., Davidson, L. The interplay between cell signalling and mechanics in developmental processes. Nat Rev Genet 14, 733–744 (2013). https://doi.org/10.1038/nrg3513
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DOI: https://doi.org/10.1038/nrg3513
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