Onai T et al. (2010), Opposing Nodal/Vg1 and BMP signals mediate axia...

XB-ART-41540

Dev Biol 2010 Aug 01;3441:377-89. doi: 10.1016/j.ydbio.2010.05.016.

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Opposing Nodal/Vg1 and BMP signals mediate axial patterning in embryos of the basal chordate amphioxus.

Onai T , Yu JK , Blitz IL , Cho KW , Holland LZ .

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The basal chordate amphioxus resembles vertebrates in having a dorsal, hollow nerve cord, a notochord and somites. However, it lacks extensive gene duplications, and its embryos are small and gastrulate by simple invagination. Here we demonstrate that Nodal/Vg1 signaling acts from early cleavage through the gastrula stage to specify and maintain dorsal/anterior development while, starting at the early gastrula stage, BMP signaling promotes ventral/posterior identity. Knockdown and gain-of-function experiments show that these pathways act in opposition to one another. Signaling by these pathways is modulated by dorsally and/or anteriorly expressed genes including Chordin, Cerberus, and Blimp1. Overexpression and/or reporter assays in Xenopus demonstrate that the functions of these proteins are conserved between amphioxus and vertebrates. Thus, a fundamental genetic mechanism for axial patterning involving opposing Nodal and BMP signaling is present in amphioxus and probably also in the common ancestor of amphioxus and vertebrates or even earlier in deuterostome evolution.

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Species referenced: Xenopus
Genes referenced: bmp4 cer1 chrd gdf1 nodal nodal1 prdm1 ventx2.2

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