Cited by 168Marine Invertebrate Physiology and EcologyDevelopmental Biology and Gene RegulationNeurogenesis and neuroplasticity mechanisms

Origins of neurogenesis, a cnidarian view

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Galliot, Brigitte, Quiquand, Manon, Ghila, Luiza, de Rosa, Renaud, Miljkovic-Licina, Marijana, Chera, Simona·2009·Developmental Biology

Abstract

New perspectives on the origin of neurogenesis emerged with the identification of genes encoding post-synaptic proteins as well as many "neurogenic" regulators as the NK, Six, Pax, bHLH proteins in the Demosponge genome, a species that might differentiate sensory cells but no neurons. However, poriferans seem to miss some key regulators of the neurogenic circuitry as the Hox/paraHox and Otx-like gene families. Moreover as a general feature, many gene families encoding evolutionarily-conserved signaling proteins and transcription factors were submitted to a wave of gene duplication in the last common eumetazoan ancestor, after Porifera divergence. In contrast gene duplications in the last common bilaterian ancestor, Urbilateria, are limited, except for the bHLH Atonal-class. Hence Cnidaria share with Bilateria a large number of genetic tools. The expression and functional analyses currently available suggest a neurogenic function for numerous orthologs in developing or adult cnidarians where neurogenesis takes place continuously. As an example, in the Hydra polyp, the Clytia medusa and the Acropora coral, the Gsx/cnox2/Anthox-2 ParaHox gene likely supports neurogenesis. Also neurons and nematocytes (mechanosensory cells) share in hydrozoans a common stem cell and several regulatory genes indicating that they can be considered as sister cells. Performed in anthozoan and medusozoan species, these studies should tell us more about the way(s) evolution hazards achieved the transition from epithelial to neuronal cell fate, and about the robustness of the genetic circuitry that allowed neuromuscular transmission to arise and be maintained across evolution.

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Crossref · 10.1016/j.ydbio.2009.05.563

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  • Much of the molecular architecture underlying neurogenesis and neuron functioning is conserved between bilaterians and cnidarians.

    “The publication of several cnidarian genomes has shown that much of the molecular architecture underlying neurogenesis and neuron functioning is conserved between bilaterians and cnidarians [17,47–51].”

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Research works printed but not linked: 2

  1. Bouillon, J., 1994b. Embranchement des cnidaires (Cnidaria). In: Grassé, P.P. (Ed.), Traité de Zoologie. Cnidaires, Cténaires, III. Fascicule II. Masson, Paris, pp. 1-28.
  2. Holstein, T., Emschermann, P., 1995. Zytologie. In: Schwoerbel, J., Zwick, P. (Eds.), Cnidaria: Hydrozoa, Kamptozoa, 1. Gustav Fisher Verlag, Stuttgart, pp. 5-15.

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Authors
Galliot, B., Quiquand, M., Ghila, L., de Rosa, R., Miljkovic-Licina, M., & Chera, S.
Affiliations
University of Geneva (CH)
Corresponding author
Galliot, Brigitte
Venue
Developmental Biology
Publisher
Elsevier BV
Published
2009-08
Volume
332
Issue
1
Pages
2-24
ISSN
0012-1606 (ISSN-L)
OpenAlex
W2037815161
Cited by
168
References
274
Citations by year
2026: 2 · 2025: 8 · 2024: 9 · 2023: 8 · 2022: 6 · 2021: 5 · 2020: 8 · 2019: 12 · 2018: 6 · 2017: 13 · 2016: 5 · 2015: 19 · 2014: 14 · 2013: 12 · 2012: 14
FWCI
1.40
Type
journal article
Language
en
Open access
Locations
  • Developmental Biology (publishedVersion)
  • PubMed (publishedVersion)
  • Archive ouverte UNIGE (University of Geneva) (acceptedVersion, other-oa)
  • Archive ouverte UNIGE (University of Geneva) (submittedVersion, cc-by)
Funders
Canton de Genève
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Marine Invertebrate Physiology and Ecology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
Keywords
Cnidaria, sponges, gene duplication, ParaHox genes, Hox genes, Acropora corals, nematocytes, stem cells, neuromuscular transmission
MeSH terms
Animals, Cnidaria, Biological Evolution, Nervous System, Neurogenesis

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