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- W2094363586 abstract "The molecular basis of vertebrate germ layer formation has been the focus of intense scrutiny for decades, and the inductive interactions underlying this process are well defined. Only recently, however, have studies demonstrated that the regulated inhibition of ectopic germ layer formation is also crucial for patterning the early vertebrate embryo. We report here the characterization of Xema (Xenopus Ectodermally-expressed Mesendoderm Antagonist), a novel member of the Foxi-subclass of winged-helix transcription factors that is involved in the suppression of ectopic germ layer formation in the frog, Xenopus laevis. Xema transcripts are restricted to the animal pole ectoderm during early Xenopus development. Ectopic expression of Xema RNA inhibits mesoderm induction, both by growth factors and in the marginal zone, in vivo. Conversely, introduction of antisense morpholino oligonucleotides directed against the Xematranscript stimulates the expression of a broad range of mesodermal and endodermal marker genes in the animal pole. Our studies demonstrate that Xema is both necessary and sufficient for the inhibition of ectopic mesendoderm in the cells of the presumptive ectoderm, and support a model in which Fox proteins function in part to restrict inappropriate germ layer development throughout the vertebrate embryo." @default.
- W2094363586 created "2016-06-24" @default.
- W2094363586 creator A5056868896 @default.
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- W2094363586 date "2005-06-15" @default.
- W2094363586 modified "2023-09-23" @default.
- W2094363586 title "<i>Xema</i>, a<i>foxi</i>-class gene expressed in the gastrula stage<i>Xenopus</i>ectoderm, is required for the suppression of mesendoderm" @default.
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- W2094363586 doi "https://doi.org/10.1242/dev.01865" @default.
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