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Size-Regulated Symmetry Breaking in Reaction-Diffusion Models of Developmental Transitions

Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA
Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Cells 2020, 9(7), 1646;
Received: 21 April 2020 / Revised: 3 July 2020 / Accepted: 6 July 2020 / Published: 9 July 2020
(This article belongs to the Special Issue Symmetry Breaking in Cells and Tissues)
The development of multicellular organisms proceeds through a series of morphogenetic and cell-state transitions, transforming homogeneous zygotes into complex adults by a process of self-organisation. Many of these transitions are achieved by spontaneous symmetry breaking mechanisms, allowing cells and tissues to acquire pattern and polarity by virtue of local interactions without an upstream supply of information. The combined work of theory and experiment has elucidated how these systems break symmetry during developmental transitions. Given that such transitions are multiple and their temporal ordering is crucial, an equally important question is how these developmental transitions are coordinated in time. Using a minimal mass-conserved substrate-depletion model for symmetry breaking as our case study, we elucidate mechanisms by which cells and tissues can couple reaction–diffusion-driven symmetry breaking to the timing of developmental transitions, arguing that the dependence of patterning mode on system size may be a generic principle by which developing organisms measure time. By analysing different regimes of our model, simulated on growing domains, we elaborate three distinct behaviours, allowing for clock-, timer- or switch-like dynamics. Relating these behaviours to experimentally documented case studies of developmental timing, we provide a minimal conceptual framework to interrogate how developing organisms coordinate developmental transitions. View Full-Text
Keywords: symmetry breaking; pattern formation; reaction-diffusion; developmental transitions symmetry breaking; pattern formation; reaction-diffusion; developmental transitions
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Cornwall Scoones, J.; Banerjee, D.S.; Banerjee, S. Size-Regulated Symmetry Breaking in Reaction-Diffusion Models of Developmental Transitions. Cells 2020, 9, 1646.

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