Activin-treated ectoderm has complete organizing center activity in Cynops embryos
نویسندگان
چکیده
منابع مشابه
Ectoderm induces muscle-specific gene expression in Drosophila embryos.
We have inhibited normal cell-cell interactions between mesoderm and ectoderm in wild-type Drosophila embryos, and have assayed the consequences on muscle development. Although most cells in gastrulation-arrested embryos do not differentiate, they express latent germ layer-specific genes appropriate for their position. Mesoderm cells require proximity to ectoderm to express several muscle-speci...
متن کاملProperties of extra-embryonic ectoderm isolated from postimplantation mouse embryos.
Extra-embryonic ectoderm isolated from the mouse embryo as late as 81/2 days post coitum can form cells with the morphological characteristics of trophoblast giant cells both in ectopic sites and in vitro. This similarity to the properties of ectoplacental cone tissue provides further support for the postulated common origin of both tissues from the trophectoderm of the blastocyst.
متن کاملActivin signalling has a necessary function in Xenopus early development
The first signalling event in Xenopus development is the mesoderm-forming (or Nieuwkoop) induction, starting three hours after fertilization [1]. Two prime candidates for the molecule that mediates this signalling are activin [2] and Vg1 [3], both members of the transforming growth factor beta (TGFbeta) family. Because genetic methods are not available for amphibian studies, 'dominant-negative'...
متن کاملActivin has direct long-range signalling activity and can form a concentration gradient by diffusion
BACKGROUND Activin has strong mesoderm-inducing properties in the early Xenopus embryo, and has a long-range signalling activity that activates genes in cells distant from a source in a concentration-dependent way. It has not yet been established what mechanism of signal transmission accounts for this and other examples of long-range signalling in vertebrates. Nor is it known whether activin it...
متن کاملXBF-1, a winged helix transcription factor with dual activity, has a role in positioning neurogenesis in Xenopus competent ectoderm.
Neuronal differentiation in the vertebrate nervous system is temporally and spatially controlled by mechanisms which are largely unknown. Here we investigate the role of XBF-1, an anterior neural plate-specific winged helix transcription factor, in controlling the pattern of neurogenesis in Xenopus ectoderm. We show that, in the anterior neural plate of normal embryos, prospective neurogenesis ...
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ژورنال
عنوان ژورنال: Development, Growth and Differentiation
سال: 1998
ISSN: 0012-1592,1440-169X
DOI: 10.1046/j.1440-169x.1998.00009.x