Abstract
Neural induction is the process through which pluripotent cells are committed to a neural fate. This first step of central nervous system formation is triggered by the ‘Spemann organizer’ in amphibians and by homologous embryonic regions in other vertebrates. Studies in classical vertebrate models have produced contrasting views about the molecular nature of neural inducers and no unifying scheme could be drawn. Moreover, how this process evolved in the chordate lineage remains unresolved. Here we show, by using graft and micromanipulation experiments, that the dorsal blastopore lip of the cephalochordate amphioxus is homologous to the vertebrate organizer and is able to trigger the formation of neural tissues in a host embryo. In addition, we demonstrate that Nodal–Activin is the main signal eliciting neural induction in amphioxus, and that it also functions as a bona fide neural inducer in the classical vertebrate model Xenopus. Together, our results allow us to propose that Nodal–Activin was a major factor for neural induction in the ancestor of chordates. This study further reveals the diversity of neural inducers used during chordate evolution and provides support against a universally conserved molecular explanation for this process.
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References
Spemann, H. & Mangold, H. in Foundation of Experimental Embryology (eds Willer, B. H. & Oppenheimer, J. M.) 144–184 (Trans. Hamburger V., New York, 1924).
Hemmati-Brivanlou, A. & Melton, D. Vertebrate embryonic cells will become nerve cells unless told otherwise. Cell 88, 13–17 (1997).
Stern, C. D. Neural induction: 10 years on since the ‘default model’. Curr. Opin. Cell Biol. 18, 692–697 (2006).
De Robertis, E. M. & Kuroda, H. Dorsal–ventral patterning and neural induction in Xenopus embryos. Annu. Rev. Cell Dev. Biol. 20, 285–308 (2004).
Ozair, M. Z., Kintner, C. & Brivanlou, A. H. Neural induction and early patterning in vertebrates. Wiley Interdiscip. Rev. Dev. Biol. 2, 479–498 (2013).
Streit, A., Berliner, A. J., Papanayotou, C., Sirulnik, A. & Stern, C. D. Initiation of neural induction by FGF signalling before gastrulation. Nature 406, 74–78 (2000).
Wilson, S. I., Graziano, E., Harland, R., Jessell, T. M. & Edlund, T. An early requirement for FGF signalling in the acquisition of neural cell fate in the chick embryo. Curr. Biol. 10, 421–429 (2000).
Launay, C., Fromentoux, V., Shi, D. L. & Boucaut, J. C. A truncated FGF receptor blocks neural induction by endogenous Xenopus inducers. Development 122, 869–880 (1996).
Linker, C. & Stern, C. D. Neural induction requires BMP inhibition only as a late step, and involves signals other than FGF and Wnt antagonists. Development 131, 5671–5681 (2004).
Delaune, E., Lemaire, P. & Kodjabachian, L. Neural induction in Xenopus requires early FGF signalling in addition to BMP inhibition. Development 132, 299–310 (2005).
Marchal, L., Luxardi, G., Thome, V. & Kodjabachian, L. BMP inhibition initiates neural induction via FGF signaling and Zic genes. Proc. Natl Acad. Sci. USA 106, 17437–17442 (2009).
Darras, S. & Nishida, H. The BMP/CHORDIN antagonism controls sensory pigment cell specification and differentiation in the ascidian embryo. Dev. Biol. 236, 271–288 (2001).
Bertrand, V., Hudson, C., Caillol, D., Popovici, C. & Lemaire, P. Neural tissue in ascidian embryos is induced by FGF9/16/20, acting via a combination of maternal GATA and Ets transcription factors. Cell 115, 615–627 (2003).
Tung, T. C., Wu, S. C. & Tung, Y. Y. F. Experimental studies on the neural induction in amphioxus. Scientia Sinica XI, 805–820 (1962).
Yu, J. K. et al. Axial patterning in cephalochordates and the evolution of the organizer. Nature 445, 613–617 (2007).
Onai, T., Yu, J. K., Blitz, I. L., Cho, K. W. & Holland, L. Z. Opposing Nodal/Vg1 and BMP signals mediate axial patterning in embryos of the basal chordate amphioxus. Dev. Biol. 344, 377–389 (2010).
Yu, J.-K., Meulemans, D., McKeown, S. J. & Bronner-Fraser, M. Insights from the amphioxus genome on the origin of vertebrate neural crest. Genome Res. 18, 1127–1132 (2008).
Kozmikova, I., Candiani, S., Fabian, P., Gurska, D. & Kozmik, Z. Essential role of Bmp signaling and its positive feedback loop in the early cell fate evolution of chordates. Dev. Biol. 382, 538–554 (2013).
Bertrand, S. et al. Amphioxus FGF signaling predicts the acquisition of vertebrate morphological traits. Proc. Natl Acad. Sci. USA 108, 9160–9165 (2011).
Weng, W. & Stemple, D. L. Nodal signaling and vertebrate germ layer formation. Birth Defects Res. C Embryo Today 69, 325–332 (2003).
Tung, T. C., Wu, S. C. & Tung, Y. F. The development of isolated blastomeres of Amphioxus. Sci. Sin. 7, 1280–1320 (1958).
Morov, A. R., Ukizintambara, T., Sabirov, R. M. & Yasui, K. Acquisition of the dorsal structures in chordate amphioxus. Open Biol. 6, 160062 (2016).
Agius, E., Oelgeschlager, M., Wessely, O., Kemp, C. & De Robertis, E. M. Endodermal Nodal-related signals and mesoderm induction in Xenopus. Development 127, 1173–1183 (2000).
Luxardi, G., Marchal, L., Thome, V. & Kodjabachian, L. Distinct Xenopus Nodal ligands sequentially induce mesendoderm and control gastrulation movements in parallel to the Wnt/PCP pathway. Development 137, 417–426 (2010).
Vonica, A. & Brivanlou, A. H. The left–right axis is regulated by the interplay of Coco, Xnr1 and derrière in Xenopus embryos. Dev. Biol. 303, 281–294 (2007).
Yan, B., Neilson, K. M. & Moody, S. A. foxD5 plays a critical upstream role in regulating neural ectodermal fate and the onset of neural differentiation. Dev. Biol. 329, 80–95 (2009).
Gupta, R., Wills, A., Ucar, D. & Baker, J. Developmental enhancers are marked independently of zygotic Nodal signals in Xenopus. Dev. Biol. 395, 38–49 (2014).
Roure, A., Lemaire, P. & Darras, S. An otx/nodal regulatory signature for posterior neural development in ascidians. PLoS Genet. 10, e1004548 (2014).
Mita, K. & Fujiwara, S. Nodal regulates neural tube formation in the Ciona intestinalis embryo. Dev. Genes Evol. 217, 593–601 (2007).
Ohtsuka, Y., Matsumoto, J., Katsuyama, Y. & Okamura, Y. Nodal signaling regulates specification of ascidian peripheral neurons through control of the BMP signal. Development 141, 3889–3899 (2014).
Camus, A., Perea-Gomez, A., Moreau, A. & Collignon, J. Absence of Nodal signaling promotes precocious neural differentiation in the mouse embryo. Dev. Biol. 295, 743–755 (2006).
Chang, C. & Harland, R. M. Neural induction requires continued suppression of both Smad1 and Smad2 signals during gastrulation. Development 134, 3861–3872 (2007).
Jia, S., Wu, D., Xing, C. & Meng, A. Smad2/3 activities are required for induction and patterning of the neuroectoderm in zebrafish. Dev. Biol. 333, 273–284 (2009).
Joseph, E. M. & Melton, D. A. Xnr4: a Xenopus nodal-related gene expressed in the Spemann organizer. Dev. Biol. 184, 367–372 (1997).
Lapraz, F., Haillot, E. & Lepage, T. A deuterostome origin of the Spemann organiser suggested by Nodal and ADMPs functions in Echinoderms. Nat. Commun. 6, 8434 (2015).
Fuentes, M. et al. Insights into spawning behavior and development of the European amphioxus (Branchiostoma lanceolatum). J. Exp. Zoolog. B Mol. Dev. Evol. 308, 484–493 (2007).
Fuentes, M. et al. Preliminary observations on the spawning conditions of the European amphioxus (Branchiostoma lanceolatum) in captivity. J. Exp. Zoolog. B Mol. Dev. Evol. 302, 384–391 (2004).
Hirakow, R. & Kajita, N. Electron microscopic study of the development of Amphioxus, Branchiostoma belcheri tsingtauense: the neurula and larva. Acta. Anat. Nippon. 69, 1–13 (1994).
Hirakow, R. & Kajita, N. Electron microscopic study of the development of amphioxus, Branchiostoma belcheri tsingtauense: the gastrula. J. Morphol. 207, 37–52 (1991).
Nieuwkoop, P. D. & Faber, J. Normal Table of Xenopus laevis (Daudin) (North Holland Publishing, 1994).
Dolez, M., Nicolas, J. F. & Hirsinger, E. Laminins, via heparan sulfate proteoglycans, participate in zebrafish myotome morphogenesis by modulating the pattern of Bmp responsiveness. Development 138, 97–106 (2011).
Somorjai, I., Bertrand, S., Camasses, A., Haguenauer, A. & Escriva, H. Evidence for stasis and not genetic piracy in developmental expression patterns of Branchiostoma lanceolatum and Branchiostoma floridae, two amphioxus species that have evolved independently over the course of 200 Myr. Dev. Genes Evol. 218, 703–713 (2008).
Plouhinec, J.-L., Zakin, L., Moriyama, Y. & De Robertis, E. M. Chordin forms a self-organizing morphogen gradient in the extracellular space between ectoderm and mesoderm in the Xenopus embryo. Proc. Natl Acad. Sci. USA 110, 20372–20379 (2013).
Oulion, S., Bertrand, S., Belgacem, M. R., Le Petillon, Y. & Escriva, H. Sequencing and analysis of the Mediterranean amphioxus (Branchiostoma lanceolatum) transcriptome. PLoS ONE 7, e36554 (2012).
Langmead, B. & Salzberg, S. L. Fast gapped-read alignment with Bowtie 2. Nat. Methods 9, 357–359 (2012).
Li, B. & Dewey, C. N. RSEM: accurate transcript quantification from RNA-seq data with or without a reference genome. BMC Bioinformatics 12, 323 (2011).
Acknowledgements
The laboratory of H.E. was supported by the CNRS and the ANR-16-CE12-0008-01 and S.B. was supported by the Institut Universitaire de France. This project was supported in L.K.’s laboratory by ANR BSV2-021-02 and by Fondation ARC. M.I. is supported by an ERC Starting Grant (grant agreement ERC-StG-LS2-637591) and the Spanish Ministry of Economy and Competitiveness (‘Centro de Excelencia Severo Ochoa 2013-2017’, SEV-2012-0208 to the CRG). Some of the Xenopus experiments were performed in the PiCSL-FBI core facility (IBDM, AMU-Marseille), member of the France-BioImaging national research infrastructure. Some of the amphioxus experiments were carried out on the Cytometry and Imaging Platform of the Observatoire Océanologique de Banyuls-sur-Mer. RNA sequencing was performed at the CRG Genomics facility. We thank S. Darras for technical help and M. Belgacem for amphioxus FGF1/2 in vitro production.
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Conceptualization of this study was done by Y.L.P., L.K., H.E. and S.B.; the study was carried out by Y.L.P., G.L., P.S., M.C., A.L., L.S., M.I., H.E. and S.B.; writing of the original draft was done by Y.L.P., L.K., H.E. and S.B.; funding was acquired by M.I., L.K., H.E. and S.B.; this study was supervised by L.K., H.E. and S.B.
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Le Petillon, Y., Luxardi, G., Scerbo, P. et al. Nodal–Activin pathway is a conserved neural induction signal in chordates. Nat Ecol Evol 1, 1192–1200 (2017). https://doi.org/10.1038/s41559-017-0226-3
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DOI: https://doi.org/10.1038/s41559-017-0226-3
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