PUBLICATION

The E3 ubiquitin-protein ligase Rbx1 regulates cardiac wall morphogenesis in zebrafish

Authors
Sarvari, P., Rasouli, S.J., Allanki, S., Stone, O.A., Sokol, A., Graumann, J., Stainier, D.Y.R.
ID
ZDB-PUB-210808-13
Date
2021
Source
Developmental Biology   480: 1-12 (Journal)
Registered Authors
Stainier, Didier
Keywords
Cardiac development, Cardiac wall morphogenesis, ErbB2 signaling, Hh signaling, Myocardium, Notch, Rbx1, Zebrafish
MeSH Terms
  • Animals
  • Genes, erbB/genetics
  • Myocytes, Cardiac/metabolism
  • Myocardium/metabolism*
  • Myocardial Contraction
  • Gene Expression/genetics
  • Morphogenesis/genetics
  • Cell Proliferation/genetics
  • Heart Ventricles/metabolism
  • Zebrafish Proteins/genetics
  • Zebrafish Proteins/metabolism
  • Hedgehog Proteins/metabolism
  • Zebrafish/genetics
  • Zebrafish/metabolism
  • Signal Transduction/genetics
  • Organogenesis/genetics
  • Endothelium/metabolism
  • Receptors, Notch/genetics
  • Receptors, Notch/metabolism
  • Heart/physiology
  • Ubiquitin-Protein Ligases/genetics
  • Ubiquitin-Protein Ligases/metabolism*
  • Endocardium/metabolism
  • Gene Expression Regulation/genetics
(all 24)
PubMed
34363825 Full text @ Dev. Biol.
Abstract
Cardiac trabeculae are muscular ridge-like structures within the ventricular wall that are crucial for cardiac function. In zebrafish, these structures first form primarily through the delamination of compact wall CMs. Although defects in proteasomal degradation have been associated with decreased cardiac function, whether they also affect cardiac development has not been extensively analyzed. Here we report a role during cardiac wall morphogenesis in zebrafish for the E3 ubiquitin-protein ligase Rbx1, which has been shown to regulate the degradation of key signaling molecules. Although development is largely unperturbed in zebrafish rbx1 mutant larvae, they exhibit cardiomyocyte multi-layering. This phenotype is not affected by blocking ErbB signaling, but fails to manifest itself in the absence of blood flow/cardiac contractility. Surprisingly, rbx1 mutants display ErbB independent Notch reporter expression in the myocardium. We generated tissue-specific rbx1 overexpression lines and found that endothelial, but not myocardial, specific rbx1 expression normalizes the cardiac wall morphogenesis phenotype. In addition, we found that pharmacological activation of Hedgehog signaling ameliorates the multi-layered myocardial wall phenotype in rbx1 mutants. Collectively, our data indicate that endocardial activity of Rbx1 is essential for cardiac wall morphogenesis.
Genes / Markers
Figures
Figure Gallery (6 images)
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Expression
Phenotype
Mutations / Transgenics
Allele Construct Type Affected Genomic Region
bns103TgTransgenic Insertion
    bns148
      Small Deletion
      bns236TgTransgenic Insertion
        bns237TgTransgenic Insertion
          ci1TgTransgenic Insertion
            f2TgTransgenic Insertion
              ncv43TgTransgenic Insertion
                ncv68TgTransgenic Insertion
                  s883TgTransgenic Insertion
                    s896TgTransgenic Insertion
                      1 - 10 of 15
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                      Human Disease / Model
                      No data available
                      Sequence Targeting Reagents
                      Target Reagent Reagent Type
                      rbx1TALEN1-rbx1TALEN
                      1 - 1 of 1
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                      Fish
                      Antibodies
                      No data available
                      Orthology
                      No data available
                      Engineered Foreign Genes
                      Marker Marker Type Name
                      DsRed2EFGDsRed2
                      ECFPEFGECFP
                      EGFPEFGEGFP
                      GFPEFGGFP
                      mCherryEFGmCherry
                      mKate2EFGmKate2
                      TomatoEFGTomato
                      VenusEFGVenus
                      1 - 8 of 8
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                      Mapping
                      No data available