A 3D model of a human epiblast reveals BMP4-driven symmetry breaking

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Item Type:	Article
Title:	A 3D model of a human epiblast reveals BMP4-driven symmetry breaking
Creators Name:	Simunovic, M., Metzger, J.J., Etoc, F., Yoney, A., Ruzo, A., Martyn, I., Croft, G., You, D.S., Brivanlou, A.H. and Siggia, E.D.
Abstract:	Breaking the anterior-posterior symmetry in mammals occurs at gastrulation. Much of the signalling network underlying this process has been elucidated in the mouse; however, there is no direct molecular evidence of events driving axis formation in humans. Here, we use human embryonic stem cells to generate an in vitro three-dimensional model of a human epiblast whose size, cell polarity and gene expression are similar to a day 10 human epiblast. A defined dose of BMP4 spontaneously breaks axial symmetry, and induces markers of the primitive streak and epithelial-to-mesenchymal transition. We show that WNT signalling and its inhibitor DKK1 play key roles in this process downstream of BMP4. Our work demonstrates that a model human epiblast can break axial symmetry despite the absence of asymmetry in the initial signal and of extra-embryonic tissues or maternal cues. Our three-dimensional model is an assay for the molecular events underlying human axial symmetry breaking.
Keywords:	Bone Morphogenetic Protein 4, Cell Polarity, Epithelial-Mesenchymal Transition, Gastrulation, Developmental Gene Expression Regulation, Germ Layers, Primitive Streak, Signal Transduction, Tissue Culture Techniques
Source:	Nature Cell Biology
ISSN:	1465-7392
Publisher:	Nature Publishing Group
Volume:	21
Number:	7
Page Range:	900-910
Date:	July 2019
Official Publication:	https://doi.org/10.1038/s41556-019-0349-7
PubMed:	View item in PubMed

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