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- W2142187906 abstract "Urodeles begin gastrulation with much of their presumptive mesoderm in the superficial cell layer, all of which must move into the deep layers during development. We studied the morphogenesis of superficial mesoderm in the urodeles Ambystoma maculatum, Ambystoma mexicanum, and Taricha granulosa. In all three species, somitic, lateral, and ventral mesoderm move into the deep layer during gastrulation, ingressing through a bilateral primitive streak just inside the blastopore. The mesodermal epithelium appears to slide under the endodermal epithelium by a mechanism we term subduction. Subduction removes the large expanse of superficial presumptive somitic and lateral-ventral mesoderm that initially separates the sub-blastoporal endoderm from the notochord, leaving the endoderm bounding the still epithelial notochord along the gastrocoel roof. Subduction may be a common feature of urodele gastrulation, differing in this regard from anurans. Subducting cells constrict their apices and become bottle-shaped as they approach the junction of the mesodermal and endodermal epithelia. Subducting bottle cells endocytose apical membrane and withdraw the tight junctional component cingulin from the contracting circumferential tight junctions. Either in conjunction with or immediately after subducting, the mesodermal cells undergo an epithelial-to-mesenchymal transition. The mechanism by which epithelial cells release their apical junctions to become mesenchymal, without disrupting the integrity of the epithelium, remains mysterious, but this system should prove useful in understanding this process in a developmental context." @default.
- W2142187906 created "2016-06-24" @default.
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- W2142187906 date "2002-08-01" @default.
- W2142187906 modified "2023-09-24" @default.
- W2142187906 title "Urodeles Remove Mesoderm from the Superficial Layer by Subduction through a Bilateral Primitive Streak" @default.
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- W2142187906 doi "https://doi.org/10.1006/dbio.2002.0718" @default.
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