Physical constraints on early blastomere packings

At very early embryonic stages, when embryos are composed of just a few cells, establishing the correct packing arrangements (contacts) between cells is essential for the proper development of the organism. As early as the 4-cell stage, the observed cellular packings in different species are distinc...

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Published in:PLoS computational biology 2021-01, Vol.17 (1), p.e1007994-e1007994
Main Authors: Giammona, James, Campàs, Otger
Format: Article
Language:English
Subjects:
Biology and Life Sciences
Cell adhesion & migration
Cell division
Cell interaction
Cell interactions
Configurations
Confining
Contact angle
Embryonic development
Embryos
Equilibrium
Genetic aspects
Metastable state
Nematodes
Noise
Physical Sciences
Physiological aspects
Random noise
Research and Analysis Methods
Simulation
Tessellation
White noise
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creator Giammona, James
Campàs, Otger
description At very early embryonic stages, when embryos are composed of just a few cells, establishing the correct packing arrangements (contacts) between cells is essential for the proper development of the organism. As early as the 4-cell stage, the observed cellular packings in different species are distinct and, in many cases, differ from the equilibrium packings expected for simple adherent and deformable particles. It is unclear what are the specific roles that different physical parameters, such as the forces between blastomeres, their division times, orientation of cell division and embryonic confinement, play in the control of these packing configurations. Here we simulate the non-equilibrium dynamics of cells in early embryos and systematically study how these different parameters affect embryonic packings at the 4-cell stage. In the absence of embryo confinement, we find that cellular packings are not robust, with multiple packing configurations simultaneously possible and very sensitive to parameter changes. Our results indicate that the geometry of the embryo confinement determines the packing configurations at the 4-cell stage, removing degeneracy in the possible packing configurations and overriding division rules in most cases. Overall, these results indicate that physical confinement of the embryo is essential to robustly specify proper cellular arrangements at very early developmental stages.
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subjects Biology and Life Sciences
Cell adhesion & migration
Cell division
Cell interaction
Cell interactions
Configurations
Confining
Contact angle
Embryonic development
Embryos
Equilibrium
Genetic aspects
Metastable state
Nematodes
Noise
Physical Sciences
Physiological aspects
Random noise
Research and Analysis Methods
Simulation
Tessellation
White noise
title Physical constraints on early blastomere packings
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