| The Allantoic Core Domain: new insights into development of the murine allantois and its relation to the primitive streak. | |
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MedLine Citation:
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PMID: 19191225 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The whereabouts and properties of the posterior end of the primitive streak have not been identified in any species. In the mouse, the streak's posterior terminus is assumed to be confined to the embryonic compartment, and to give rise to the allantois, which links the embryo to its mother during pregnancy. In this study, we have refined our understanding of the biology of the murine posterior primitive streak and its relation to the allantois. Through a combination of immunostaining and morphology, we demonstrate that the primitive streak spans the posterior extraembryonic and embryonic regions at the onset of the neural plate stage ( approximately 7.0 days postcoitum, dpc). Several hours later, the allantoic bud emerges from the extraembryonic component of the primitive streak (XPS). Then, possibly in collaboration with overlying allantois-associated extraembryonic visceral endoderm, the XPS establishes a germinal center within the allantois, named here the Allantoic Core Domain (ACD). Microsurgical removal of the ACD beyond headfold (HF) stages resulted in the formation of allantoic regenerates that lacked the ACD and failed to elongate; nevertheless, vasculogenesis and vascular patterning proceeded. In situ and transplantation fate mapping demonstrated that, from HF stages onward, the ACD's progenitor pool contributed to the allantois exclusive of the proximal flanks. By contrast, the posterior intraembryonic primitive streak (IPS) provided the flanks. Grafting the ACD into T(C)/T(C) hosts, whose allantoises are significantly foreshortened, restored allantoic elongation. These results revealed that the ACD is essential for allantoic elongation, but the cues required for vascularization lie outside of it. On the basis of these and previous findings, we conclude that the posterior primitive streak of the mouse conceptus is far more complex than was previously believed. Our results provide new directives for addressing the origin and development of the umbilical cord, and establish a novel paradigm for investigating the fetal/placental relationship. |
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Authors:
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Karen M Downs; Kimberly E Inman; Dexter X Jin; Allen C Enders |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural |
Journal Detail:
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Title: Developmental dynamics : an official publication of the American Association of Anatomists Volume: 238 ISSN: 1058-8388 ISO Abbreviation: Dev. Dyn. Publication Date: 2009 Mar |
Date Detail:
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Created Date: 2009-03-03 Completed Date: 2009-05-04 Revised Date: 2011-12-02 |
Medline Journal Info:
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Nlm Unique ID: 9201927 Medline TA: Dev Dyn Country: United States |
Other Details:
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Languages: eng Pagination: 532-53 Citation Subset: IM |
Copyright Information:
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(c) 2009 Wiley-Liss, Inc. |
Affiliation:
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Department of Anatomy, University of Wisconsin-Madison School of Medicine and Public Health, 1300 University Avenue, Madison, WI 53706, USA. kdowns@wisc.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Allantois
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blood supply,
embryology*,
metabolism,
transplantation Animals Body Patterning Mice Microscopy, Electron, Transmission Primitive Streak / embryology* Vascular Endothelial Growth Factor Receptor-2 / metabolism |
| Grant Support | |
ID/Acronym/Agency:
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R01 HD042706/HD/NICHD NIH HHS; R01 HD042706-01/HD/NICHD NIH HHS; R01 HD042706-02/HD/NICHD NIH HHS; R01 HD042706-03/HD/NICHD NIH HHS; R01 HD042706-04/HD/NICHD NIH HHS; R01 HD042706-05/HD/NICHD NIH HHS; R01 HD042706-06/HD/NICHD NIH HHS; R01 HD042706-07/HD/NICHD NIH HHS; R01 HD042706-08/HD/NICHD NIH HHS; R01 HD042706-09/HD/NICHD NIH HHS |
| Chemical | |
Reg. No./Substance:
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EC 2.7.10.1/Vascular Endothelial Growth Factor Receptor-2 |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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