Cited by 110Marine Invertebrate Physiology and EcologyDevelopmental Biology and Gene RegulationNeurogenesis and neuroplasticity mechanisms

Transgenic analysis of a SoxB gene reveals neural progenitor cells in the cnidarian Nematostella vectensis

Richards, Gemma Sian, Rentzsch, Fabian·2014·Development

Abstract

Bilaterian neurogenesis is characterized by the generation of diverse neural cell types from dedicated neural stem/progenitor cells (NPCs). However, the evolutionary origin of NPCs is unclear, as neurogenesis in representatives of the bilaterian sister group, the Cnidaria, occurs via interstitial stem cells that also possess broader, non-neural, developmental potential. We address this question by analysing neurogenesis in an anthozoan cnidarian, Nematostella vectensis. Using a transgenic reporter line, we show that NvSoxB(2) – an orthologue of bilaterian SoxB genes that have conserved roles in neurogenesis – is expressed in a cell population that gives rise to sensory neurons, ganglion neurons and nematocytes: the three primary neural cell types of cnidarians. EdU labelling together with in situ hybridization, and within the NvSoxB(2)::mOrange transgenic line, demonstrates that cells express NvSoxB(2) before mitosis and identifies asymmetric behaviours of sibling cells within NvSoxB(2)+ lineages. Morpholino-mediated gene knockdown of NvSoxB(2) blocks the formation of all three neural cell types, thereby identifying NvSoxB(2) as an essential positive regulator of nervous system development. Our results demonstrate that diverse neural cell types derive from an NvSoxB(2)-expressing population of mitotic cells in Nematostella and that SoxB genes are ancient components of a neurogenic program. To our knowledge this is the first description of a lineage-restricted, multipotent cell population outside the Bilateria and we propose that neurogenesis via dedicated, SoxB-expressing NPCs predates the split between cnidarians and bilaterians.

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Crossref · 10.1242/dev.112029

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  • In Nematostella, Elav1 marks a large neuronal subpopulation but is not a pan-neuronal marker, because it is part of a larger population marked by SoxB(2).

    “In Nematostella, it indeed marks a large neuronal subpopulation [26,27], but is not a pan-neuronal marker (figure 2a,e), as it is part of a larger population marked by SoxB(2) [29]”
  • Analysis of the SoxB(2)::mOrange transgenic line showed that neurites can extend in any direction from the onset of differentiation.

    “Analysis of the SoxB(2)::mOrange transgenic line, which broadly labels neural progenitors and their progeny, showed that neurites can extend in any direction from the onset of differentiation [29].”
  • The most aboral region, the apical organ, remains free of Elav1 and SoxB(2) neural cell bodies.

    “Notably, the most aboral region, the ‘apical organ’, often referred to as a sensory centre, remains free of Elav1 and SoxB(2) neural cell bodies [27,29].”
  • SoxB(2) marks a population of cells that gives rise to ganglion and sensory neurons and cnidocytes, representing a general neural progenitor population.

    “Using a SoxB(2) transgenic reporter line, Richards and Rentzsch showed that SoxB(2) marks a population of cells that gives rise to ganglion and sensory neurons and cnidocytes, thus representing a general neural progenitor population [29].”
  • The BMP signalling gradient in Nematostella has been detected only considerably later (at gastrula stage) than the occurrence of the first neural progenitor cells (at mid-blastula stage), and early neural differentiation is not biased along the directive axis.

    “However, this BMP signalling gradient has been detected only considerably later (at gastrula stage, [39,40]) than the occurrence of the first neural progenitor cells (NPCs; at mid-blastula stage [29]) and early neural differentiation is not biased along the directive axis [26,27,29,41].”

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Authors
Richards, G. S., & Rentzsch, F.
Affiliations
University of Bergen (NO)
Venue
Development
Published
2014-12-15
Volume
141
Issue
24
Pages
4681-4689
ISSN
  • 0950-1991 (ISSN-L)
  • 1477-9129
OpenAlex
W2027035529
Cited by
110
References
49
Citations by year
2026: 7 · 2025: 12 · 2024: 11 · 2023: 8 · 2022: 10 · 2021: 3 · 2020: 12 · 2019: 9 · 2018: 9 · 2017: 11 · 2016: 9 · 2015: 9
FWCI
7.04
Type
journal article
Language
en
Open access
closed
Locations
  • Development (publishedVersion)
  • PubMed (publishedVersion)
  • HighWire Press Open Archive (submittedVersion)
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
Nematostella vectensis, neural progenitor cells, interstitial stem cells, brain development, sensory neurons, ganglionic neurons, nematocytes, asymmetric cell division, morpholino knockdown
MeSH terms
Animals, Biological Evolution, Ganglia, Immunohistochemistry, Sensory Receptor Cells, Sea Anemones, In Situ Hybridization, In Situ Hybridization, Fluorescence, Gene Transfer Techniques, Cell Lineage, Reverse Transcriptase Polymerase Chain Reaction, Multipotent Stem Cells, Neurogenesis, SOXB2 Transcription Factors, Gene Knockdown Techniques, Nematocyst, Neural Stem Cells, Morpholinos

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