Abstract
During neural induction, the ‘organizer’ of the vertebrate embryo instructs neighbouring ectodermal cells to become nervous system rather than epidermis. This process is generally thought to occur around the mid-gastrula stage of embryogenesis1. Here we report the isolation of ERNI, an early response gene to signals from the organizer (Hensen's node). Using ERNI as a marker, we present evidence that neural induction begins before gastrulation—much earlier in development than previously thought. We show that the organizer and some of its precursor cells produce a fibroblast growth factor signal, which can initiate, and is required for, neural induction.
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Acknowledgements
We thank A. Rosenthal and W. Ye (Genentech) for the FGFR1-IgG construct; R. Lovell-Badge for Sox3 and Sox2 and T. Jessell for S17; C. Dulac for advice on the differential screen; B. Cigich for technical assistance; I. Skromne for Fig. 4b, c; C. Ang for zebrafinch tissue; and T. Jessell, G. Sheng, K. Storey and D. Vasiliauskas for helpful comments on the manuscript. Supported by the National Institute of Mental Health.
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Streit, A., Berliner, A., Papanayotou, C. et al. Initiation of neural induction by FGF signalling before gastrulation . Nature 406, 74–78 (2000). https://doi.org/10.1038/35017617
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DOI: https://doi.org/10.1038/35017617
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