Abstract
In mice, there is evidence suggesting that the development of head and trunk structures is organized by distinctly separated cell populations1,2. The head organizer is located in the anterior visceral endoderm (AVE) and the trunk organizer in the node and anterior primitive streak. In amphibians, Spemann's organizer, which is homologous to the node, partially overlaps with anterior endoderm cells expressing homologues of the AVE markers cerberus, Hex and Hesx1 (refs 3,4,5,6). For mice, this raises the question of whether the AVE and node are independent of each other, as suggested by their anatomical separation, or functionally interdependent as is the case in amphibians3,4,5. Chordin and Noggin are secreted bone morphogenetic protein (BMP) antagonists7,8 expressed in the mouse node, but not in the AVE. Here we show that mice double-homozygous mutants that are for chordin and noggin display severe defects in the development of the prosencephalon. The results show that BMP antagonists in the node and its derivatives are required for head development.
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Acknowledgements
We thank R. Beddington, G. Oliver, D. Wilkinson and A. Joyner for gifts of plasmids, K. Woo, C. De Robertis, B. Yoon and A. Burnett for help with genotyping, and K. Lyons, G. Weinmaster, E. Delot and members of our laboratories for comments on the manuscript. This work was supported by the HHMI, NIH, MRC Canada, Whitehead Foundation and the Norman Sprague Chair.
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Bachiller, D., Klingensmith, ., Kemp, C. et al. The organizer factors Chordin and Noggin are required for mouse forebrain development. Nature 403, 658–661 (2000). https://doi.org/10.1038/35001072
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DOI: https://doi.org/10.1038/35001072
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