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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
Publication : Science (New York, N.Y.)

A tensile ring drives tissue flows to shape the gastrulating amniote embryo

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Science (New York, N.Y.) - 24 Jan 2020

Saadaoui M, Rocancourt D, Roussel J, Corson F, Gros J

Link to Pubmed [PMID] – 31974255

Science 2020 01;367(6476):453-458

Tissue morphogenesis is driven by local cellular deformations that are powered by contractile actomyosin networks. How localized forces are transmitted across tissues to shape them at a mesoscopic scale is still unclear. Analyzing gastrulation in entire avian embryos, we show that it is driven by the graded contraction of a large-scale supracellular actomyosin ring at the margin between the embryonic and extraembryonic territories. The propagation of these forces is enabled by a fluid-like response of the epithelial embryonic disk, which depends on cell division. A simple model of fluid motion entrained by a tensile ring quantitatively captures the vortex-like “polonaise” movements that accompany the formation of the primitive streak. The geometry of the early embryo thus arises from the transmission of active forces generated along its boundary.

https://www.ncbi.nlm.nih.gov/pubmed/31974255