Desmoplakin is required for epidermal integrity and morphogenesis in the Xenopus laevis embryo
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Abstract
Desmoplakin (Dsp) is a unique and critical desmosomal protein, that is integral to epidermal development. However, it is unclear whether this protein is required specifically for epidermal morphogenesis. Using morpholinos or Crispr/Cas9 mutagenesis we decreased the function of Dsp in frog embryos to better understand its role during epidermal development. Dsp morphant and mutant embryos had developmental defects such as epidermal fragility that mimicked what has been reported in mammals. Most importantly, we also uncovered a novel function for Dsp in the morphogenesis of the epidermis in X. laevis. In particular, Dsp is required during the process of radial intercalation where basally located cells move into the outer epidermal layer. Once inserted these newly intercalated cells expand their apical surface and then they differentiate into specific epidermal cell types. Decreased levels of Dsp resulted in the failure of the radially intercalating cells to expand their apical surface, thereby reducing the number of differentiated multiciliated and secretory cells. Such defects correlate with changes in E-cadherin levels and actin and microtubule localization which could explain the defects in apical expansion. A mutated form of Dsp that maintains cell-cell adhesion but eliminates the connections to the cytoskeleton results in the same epidermal morphogenesis defect. These results suggest a specific role for Dsp in the apical expansion of cells during radial intercalation. We have developed a novel system, in the frog, to demonstrate for the first time that desmosomes not only protect against mechanical stress but are also critical for epidermal morphogenesis.
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Desmosomes are an evolutionary innovation of vertebrates and share a conserved role in maintaining epidermal integrity to mechanical stress, including in amphibians.
“Desmosomes are an evolutionary innovation of vertebrates (Green et al., 2020) and share a conserved role in maintaining epidermal integrity to mechanical stress including in amphibians (Bharathan and Dickinson, 2019).”
From Genomic and physiological mechanisms underlying skin plasticity during water to air transition in an amphibious fish (2020) · cites this paper as Bharathan and Dickinson, 2019
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Epidermal Development in Mammals: Key Regulators, Signals from Beneath, and Stem Cells
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Dubaissi, E., & Papalopulu, N. (2011) · Disease Models & Mechanisms · doi:10.1242/dmm.006494 · Cited by 102 · see citing works
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Dong, Y.-W., Blanchard, T. S., Noll, A., Vasquez, P., Schmitz, J., Kelly, S. P., Wright, P. A., & Whitehead, A. (2020) · Journal of Experimental Biology · doi:10.1242/jeb.235515 · Cited by 18 · see citing works
- Authors
- Bharathan, N. K., & Dickinson, A. J. G.
- Affiliations
- Emory University (US)
- Virginia Commonwealth University (US)
- Corresponding author
- Dickinson, Amanda J.G.
- Venue
- Developmental Biology
- Publisher
- Elsevier BV
- Published
- 2019-06
- Volume
- 450
- Issue
- 2
- Pages
- 115-131
- ISSN
- 0012-1606 (ISSN-L)
- PMC
- PMC6659752
- OpenAlex
- W2952609100
- Cited by
- 32
- References
- 3
- Citations by year
- 2026: 4 · 2025: 4 · 2024: 3 · 2023: 4 · 2022: 3 · 2021: 4 · 2020: 8 · 2019: 2
- FWCI
- 2.25
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Developmental Biology (publishedVersion)
- bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Science Foundation (IOS-1349668)
- National Institutes of Health (RAR065583A)
- NIH-NCI (P30 CA016059)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Skin and Cellular Biology Research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
- Health Sciences › Medicine › Immunology and Allergy › Cell Adhesion Molecules Research
- Keywords
- desmoplakin, desmosomes, epidermal morphogenesis, epidermal development, E-cadherin, actin localization, microtubules, multiciliated cells, secretory cells, Xenopus laevis embryos, cell-cell adhesion, cytoskeleton
- MeSH terms
- Animals, Cell Adhesion, Cell Communication, Embryo, Nonmammalian, Epidermis, Morphogenesis, Xenopus laevis, Xenopus Proteins, Desmoplakins
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