Determination During Embryogenesis

Gardner, Richard L.; Rossant, Janet

doi:10.1002/9780470720226.ch2

Cited by 27 publications

(3 citation statements)

References 28 publications

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“…The term trophectoderm (TE; see figure 1 a ) was only later adopted (borrowing from its use in the marsupial unilaminar blastocyst, [40]) to distinguish between these superficial cells before and after implantation. The peri-implantation embryo was also studied in great detail leading to distinguishing between tissues with a common origin [41], such as the parietal and visceral entoderm (later endoderm; see figure 1 a and following section for details) initially based on marked histological distinctions [42,43].…”

Section: Changing Notions Of the Extraembryonic Through History Of Em...mentioning

confidence: 99%

Embryonic and extraembryonic tissues during mammalian development: shifting boundaries in time and space

Thowfeequ

Srinivas

2022

Phil. Trans. R. Soc. B

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The first few days of embryonic development in eutherian mammals are dedicated to the specification and elaboration of the extraembryonic tissues. However, where the fetus ends and its adnexa begins is not always as self-evident during the early stages of development, when the definitive body axes are still being laid down, the germ layers being specified and a discrete form or bodyplan is yet to emerge. Function, anatomy, histomorphology and molecular identities have been used through the history of embryology, to make this distinction. In this review, we explore them individually by using specific examples from the early embryo. While highlighting the challenges of drawing discrete boundaries between embryonic and extraembryonic tissues and the limitations of a binary categorization, we discuss how basing such identity on fate is the most universal and conceptually consistent. This article is part of the theme issue ‘Extraembryonic tissues: exploring concepts, definitions and functions across the animal kingdom’.

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Section: Changing Notions Of the Extraembryonic Through History Of Em...mentioning

confidence: 99%

Embryonic and extraembryonic tissues during mammalian development: shifting boundaries in time and space

Thowfeequ

Srinivas

2022

Phil. Trans. R. Soc. B

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“…8A). Gardner & Rossant (1976) and Falconer & Avery (1978) maintained that PGCs originate from cells of the primary epiblast of the embryonic node from which both PGCs and somatic cells later derive.…”

Section: Origin Of Pgcs In Therian Mammalsmentioning

confidence: 99%

“…As regards the origin of PGCs, if one refers to very early stages of development, it is obvious that these cells arise from the epiblast of the early blastula (Gardner & Rossant, 1976;Falconer & Avery, 1978;Saga et al, 1996;Koshimizu et al, 1996), but this epiblastic origin has no phylogenetic meaning since all the embryonic structures arise from the epiblast if we refer to a very early blastula. On the contrary, an evaluation is possible when the subsequent stages of the embryogenetic process, showing variations among different taxa, are compared.…”

Section: Problems and Aim Of The Papermentioning

confidence: 99%

The problem of the origin of primordial germ cells (PGCs) in vertebrates: historical review and a possible solution

Pilato

D'Urso²,

Viglianisi³

et al. 2013

Int. J. Dev. Biol.

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A concise review of the articles about the origin of primordial germ cells (PGCs) in vertebrates is provided. Differences among various taxa concerning the origin of PGCs, not easily understandable on the base of traditional knowledge, are pointed out. All those differences can be explained taking into consideration the recent "theory of the endoderm as secondary layer". That theory allows us to understand that those differences are only apparent, being related to modifications of stages of the consequent embryogeny, overall, to a different amount of yolk in the egg. Eggs very rich in yolk became meroblastic, and the portion of primordial ectomesenchyme destined to give rise to a part of the mesoderm and the PGCs separates early from the part destined to give rise to the rest of the mesoderm and to the digestive endoderm in order to form the vitelline hypoblast lamina. To this lamina, in contrast to the traditional interpretation, a mesodermal, not endodermal, origin must be attributed. With the misunderstanding regarding the origin of this lamina clarified, all the differences about the origin of PGCs disappears. Furthermore, in taxa where PGCs were considered to be of endodermal origin, they too have a mesodermal origin. Considering that a mesodermal origin of PGCs has been demonstrated in all sponges and cnidarians, as well, a unique, mesodermal origin of germinal cells in all pluricellular animals results.

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Regulation of Mesenchymal Cell Growth During Human Limb Morphogenesis Through Glycosaminoglycan‐Adenylate Cyclase Interaction at the Cell Surface

Kelley

Palmer

1976

Ciba Foundation Symposium 40 ‐ Embryogenesis in Mammals

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Determination During Embryogenesis

Cited by 27 publications

References 28 publications

Embryonic and extraembryonic tissues during mammalian development: shifting boundaries in time and space

Embryonic and extraembryonic tissues during mammalian development: shifting boundaries in time and space

The problem of the origin of primordial germ cells (PGCs) in vertebrates: historical review and a possible solution

Regulation of Mesenchymal Cell Growth During Human Limb Morphogenesis Through Glycosaminoglycan‐Adenylate Cyclase Interaction at the Cell Surface

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