Lee, Hyung Chul;
Hastings, Cato;
Stern, Claudio D;
(2022)
The extra-embryonic area opaca plays a role in positioning the primitive streak of the early chick embryo.
Development
, 149
(12)
, Article dev200303. 10.1242/dev.200303.
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Abstract
Classical studies have established that the marginal zone, a ring of extra-embryonic epiblast immediately surrounding the embryonic epiblast (area pellucida) of the chick embryo, is important in setting embryonic polarity by positioning the primitive streak, the site of gastrulation. The more external extra-embryonic region (area opaca) was thought to have only nutritive and support functions. Using experimental embryology approaches, this study reveals three separable functions for this outer region. First, juxtaposition of the area opaca directly onto the area pellucida induces a new marginal zone from the latter; this induced domain is entirely posterior in character. Second, ablation and grafting experiments using an isolated anterior half of the blastoderm and pieces of area opaca suggest that the area opaca can influence the polarity of the adjacent marginal zone. Finally, we show that the loss of the ability of such isolated anterior half-embryos to regulate (re-establish polarity spontaneously) at the early primitive streak stage can be rescued by replacing the area opaca by one from a younger stage. These results uncover new roles of chick extra-embryonic tissues in early development.
| Type: | Article |
|---|---|
| Title: | The extra-embryonic area opaca plays a role in positioning the primitive streak of the early chick embryo |
| Location: | England |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1242/dev.200303 |
| Publisher version: | https://doi.org/10.1242/dev.200303 |
| Language: | English |
| Additional information: | This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third-party material in this article are included in the Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
| Keywords: | Embryo polarity, Embryonic axis, Embryonic regulation, Gastrulation, Regeneration, Symmetry breaking, Animals, Blastoderm, Chick Embryo, Gastrula, Primitive Streak |
| UCL classification: | UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Cell and Developmental Biology |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10150946 |
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