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© Aline Bonnet, Institut Pasteur
Coupe transversale d’embryon de caille transgénique mbGFP à 18somites, au niveau du futur bourgeon de membre antérieur avec un marquage noyaux (bleu), GFP (vert) et actine (rouge) / Transversal section of a mbGFP transgenic quail embryo at 18-somite stage, at forelimb level, with nuclei (blue), GFP (green) and actin (red) labelling
Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Nature - 11 Sep 2024

Caldarelli P, Chamolly A, Villedieu A, Alegria-Prévot O, Phan C, Gros J, Corson F

Link to Pubmed [PMID] – 39261736

Link to DOI – 10.1038/s41586-024-07934-8

Nature 2024 Sep; ():

Early amniote development is highly self-organized, capable of adapting to interference through local and long-range cell-cell interactions. This process, called embryonic regulation1, has been well illustrated in experiments on avian embryos, in which subdividing the epiblast disk into different parts not only redirects cell fates to eventually form a complete and well-proportioned embryo at its original location, but also leads to the self-organization of additional, fully formed embryos2,3 in the other separated parts. The cellular interactions underlying embryonic self-organization are widely believed to be mediated by molecular signals, yet the identity of such signals is unclear. Here, by analysing intact and mechanically perturbed quail embryos, we show that the mechanical forces that drive embryogenesis self-organize, with contractility locally self-activating and the ensuing tension acting as a long-range inhibitor. This mechanical feedback governs the persistent pattern of tissue flows that shape the embryo4-6 and also steers the concomitant emergence of embryonic territories by modulating gene expression, ensuring the formation of a single embryo under normal conditions, yet allowing the emergence of multiple, well-proportioned embryos after perturbations. Thus, mechanical forces act at the core of embryonic self-organization, shaping both tissues and gene expression to robustly yet plastically canalize early development.