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- W2071684809 abstract "We describe here a novel inductive action that operates during somitic segmentation in chicken embryos. We previously reported that the posterior border cells located at a next-forming boundary in the anterior end of the presomitic mesoderm (PSM) exhibit an inductive activity that acts on the anterior cells to cause the formation of a somitic fissure (Sato, Y., Yasuda, K., Takahashi, Y., 2002. Morphological boundary forms by a novel inductive event mediated by Lunatic fringe and Notch during somitic segmentation. Development 129, 3633–3644). In this study, we have found a second inductive action along the dorso-ventral (D–V) axis during fissure formation. When relocated into a non-segmenting region of PSM, the ventral-most cells taken from the presumptive boundary are sufficient to induce an ectopic fissure in host cells. The ventrally derived signal acts in a ventral-to-dorsal direction but not ventrally, regardless of where the ventral cells are placed. This directional signaling is governed, at least in part, by the signal-receiving cells of the PSM, which we found to be polarized along the D–V axis, and also by intimate cell–cell interactions. Finally, we have observed that morphological segmentation is able to rearrange the anterior and posterior regionalization of individual somites. These findings suggest that discrete unidirectional signals along both the antero-posterior and the D–V axes act coordinately to achieve the formation of the intersomitic fissure, and also that fissure formation is important for the fine-tuning of A–P regionalization in individual somites." @default.
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- W2071684809 date "2005-06-01" @default.
- W2071684809 modified "2023-09-27" @default.
- W2071684809 title "A novel signal induces a segmentation fissure by acting in a ventral-to-dorsal direction in the presomitic mesoderm" @default.
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- W2071684809 doi "https://doi.org/10.1016/j.ydbio.2005.03.007" @default.
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