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Polarity and morphogenesis of the eye epithelium requires the adhesion junction associated adaptor protein Traf4.

Authors
  • Hehr, Carrie Lynn1
  • Halabi, Rami1
  • McFarlane, Sarah1
  • 1 a Department of Cell Biology and Anatomy , University of Calgary, Hotchkiss Brain Institute, Alberta Children's Hospital Research Institute , Calgary , AB , Canada. , (Canada)
Type
Published Article
Journal
Cell Adhesion & Migration
Publisher
Landes Bioscience
Publication Date
Jul 31, 2018
Pages
1–14
Identifiers
DOI: 10.1080/19336918.2018.1477900
PMID: 29961393
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

During development, neuroepithelial progenitors acquire apico-basal polarity and adhere to one another via apically located tight and adherens junction complexes. This polarized neuroepithelium must continue to integrate cells arising through cell divisions and intercalation, and allow for cell movements, at the same time as undergoing morphogenesis. Cell proliferation, migration and intercalation all occur in the morphing embryonic eye. To understand how eye development might depend on dynamic epithelial adhesion, we investigated the function of a known regulator of junctional plasticity, Tumour necrosis factor receptor-associated factor 4 (Traf4). traf4a mRNA is expressed in the developing eye vesicle over the period of optic cup morphogenesis, and Traf4a loss leads to disrupted evagination and elongation of the eye vesicles, and aberrant organization and apico-basal polarity of the eye epithelium. We propose a model whereby Traf4a regulates apical junction plasticity in nascent eye epithelium, allowing for its polarization and morphogenesis. Symbols and Abbreviations: AB: apico-basal; aPKC: atypical protein kinase-C; CRISPR: clustered regularly-interspaced short palindromic repeats; GFP: green fluorescent protein; hpf: hours post-fertilization; MO: antisense morpholino oligonucleotide; pHH3: phospho histone H3; ss: somite stage; Traf4: Tumour necrosis factor receptor-associated factor 4; ZO-1: zona occludens-1.

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