As an embryo builds itself, cells physically squash and stretch each other, and those mechanical changes feed back to alter which genes switch on or off. This matters because the standard textbook model treats development as a one-way street: biochemical signals tell cells what to become, and shape follows. But that linear picture cannot explain how embryos achieve such reliable, reproducible results. The researchers have identified two specific mechanisms in mouse embryos—one involving cadherin proteins that dampen anti-neural signals, another where cells cluster to amplify pro-mesoderm signals—that show physical structure itself provides information that guides cell fate decisions. This is fundamental science. There is no immediate practical application. However, understanding how mechanical cues and biochemical signals integrate across different timescales could eventually give researchers better control over lab-grown organoids, tissue repair, and even tumour growth. The same way that discovering how cells read chemical gradients transformed stem cell biology, learning how they read physical forces could reshape how we grow replacement tissues or understand why cancers escape normal developmental constraints.
View original technical description
As cells build the body, they use information from localised secreted signals to guide differentiation and morphogenesis. It is often assumed there is unidirectional flow of information from these biochemical signals to the resulting morphological changes, but this 'linear' model cannot explain how development is orchestrated with such remarkable reproducibility. We have found that changes in epithelial structure provide a previously underappreciated source of information that feeds back into differentiation decisions by modulating biochemical signalling. Using mouse gastrulation as a paradigm we have identified candidate molecular mechanisms that mediate this feedback: 1) A cadherin-mediated community effect that dampens anti-neural signals to synchronise neural differentiation 2) a cell-clustering process that amplifies juxtacrine pro-mesoderm signalling to coordinate differentiation across collectives of cells. We propose that these two interlinked mechanisms coordinate distinct sources of information across different time scales. We will test this in vitro and in vivo using a unique toolkit based on molecular and biophysical manipulation of epithelial structure, mosaic analysis, and custom-developed quantitative image analysis software. Generalisable principles emerging from this work will help resolve the currently unpredictable relationship between "signalling-input" and "differentiation-output" to give us better control over in-vitro differentiation, organoid formation, tissue repair, and tumorogenesis.
Plain English summaries and category classifications on this site are generated by AI and may not perfectly reflect the original research.
Is something wrong? Let us know