Cited by 68Developmental Biology and Gene RegulationMarine Invertebrate Physiology and EcologyNeurogenesis and neuroplasticity mechanisms

Non-canonical Notch signaling represents an ancestral mechanism to regulate neural differentiation

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Layden, Michael J, Martindale, Mark Q·2014·EvoDevo

Abstract

BACKGROUND: Cellular differentiation is a critical process during development of multicellular animals that must be tightly controlled in order to avoid precocious differentiation or failed generation of differentiated cell types. Research in flies, vertebrates, and nematodes has led to the identification of a conserved role for Notch signaling as a mechanism to regulate cellular differentiation regardless of tissue/cell type. Notch signaling can occur through a canonical pathway that results in the activation of hes gene expression by a complex consisting of the Notch intracellular domain, SuH, and the Mastermind co-activator. Alternatively, Notch signaling can occur via a non-canonical mechanism that does not require SuH or activation of hes gene expression. Regardless of which mechanism is being used, high Notch activity generally inhibits further differentiation, while low Notch activity promotes differentiation. Flies, vertebrates, and nematodes are all bilaterians, and it is therefore unclear if Notch regulation of differentiation is a bilaterian innovation, or if it represents a more ancient mechanism in animals. RESULTS: To reconstruct the ancestral function of Notch signaling we investigate Notch function in a non-bilaterian animal, the sea anemone Nematostella vectensis (Cnidaria). Morpholino or pharmacological knockdown of Nvnotch causes increased expression of the neural differentiation gene NvashA. Conversely, overactivation of Notch activity resulting from overexpression of the Nvnotch intracellular domain or by overexpression of the Notch ligand Nvdelta suppresses NvashA. We also knocked down or overactivated components of the canonical Notch signaling pathway. We disrupted NvsuH with morpholino or by overexpressing a dominant negative NvsuH construct. We saw no change in expression levels for Nvhes genes or NvashA. Overexpression of Nvhes genes did not alter NvashA expression levels. Lastly, we tested additional markers associated with neuronal differentiation and observed that non-canonical Notch signaling broadly suppresses neural differentiation in Nematostella. CONCLUSIONS: We conclude that one ancestral role for Notch in metazoans was to regulate neural differentiation. Remarkably, we found no evidence for a functional canonical Notch pathway during Nematostella embryogenesis, suggesting that the non-canonical hes-independent Notch signaling mechanism may represent an ancestral Notch signaling pathway.

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Crossref · 10.1186/2041-9139-5-30

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  • Notch/Delta function in neurogenesis in Nematostella is not conducted through the canonical pathway involving Su(H), but through a non-canonical, yet unidentified route.

    “More surprising was the finding that the Notch/Delta function in neurogenesis is not conducted through the canonical pathway, i.e. involving suppressor of hairy (Su(H)), but a non-canonical, yet unidentified route [61].”
  • In Nematostella, the Notch/Delta system is involved in determining the fate of neural lineage cells, and Notch/Delta signalling influences the expression of neurogenic markers such as AshA.

    “It appears that, in Nematostella, the Notch/Delta system is also involved in determining the fate of neural lineage cells. By using pharmacological treatments with the γ-secretase inhibitor DAPT, it was shown that the Notch/Delta signalling influences the expression of neurogenic markers [60], e.g. the achaete-scute homologue (AshA) among others [61].”
  • In that ancestor, epithelial cells were singled out to become neurons by a cell-determining system such as the Notch/Delta system.

    “which were singled out to become neurons by a cell-determining system (e.g. the Notch/Delta system) [61]”

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Authors
Layden, M. J., & Martindale, M. Q.
Affiliations
  • Lehigh University (US)
  • University of Florida (US)
Corresponding author
Martindale, Mark Q
Venue
EvoDevo
Published
2014
Volume
5
Issue
1
Pages
30
ISSN
2041-9139 (ISSN-L)
OpenAlex
W2100886237
Cited by
68
References
45
Citations by year
2026: 1 · 2025: 5 · 2024: 7 · 2023: 3 · 2022: 17 · 2021: 3 · 2020: 3 · 2019: 2 · 2018: 5 · 2017: 7 · 2016: 6 · 2015: 9
FWCI
3.01
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • EvoDevo (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • University of Florida Digital Collections (University of Florida) (submittedVersion, other-oa)
Funders
  • National Institutes of Health
  • National Institute of General Medical Sciences (R01GM093116)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Marine Invertebrate Physiology and Ecology
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
Keywords
Notch signaling, neuronal differentiation, Nematostella vectensis, Hes genes, Cnidaria, embryonic development

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