PUBLICATION

The Ribosome Biogenesis Protein Nol9 Is Essential for Definitive Hematopoiesis and Pancreas Morphogenesis in Zebrafish

Authors
Bielczyk-Maczyńska, E., Lam Hung, L., Ferreira, L., Fleischmann, T., Weis, F., Fernández-Pevida, A., Harvey, S.A., Wali, N., Warren, A.J., Barroso, I., Stemple, D.L., Cvejic, A.
ID
ZDB-PUB-151202-3
Date
2015
Source
PLoS Genetics   11: e1005677 (Journal)
Registered Authors
Stemple, Derek L.
Keywords
Larvae, Pancreas, Embryos, Zebrafish, Ribosomal RNA, Ribosomes, Biosynthesis, In situ hybridization
MeSH Terms
  • Hematopoiesis/genetics
  • Zebrafish
  • Hematopoietic Stem Cells/pathology
  • Morphogenesis/genetics*
  • Pancreas/metabolism
  • Pancreas/pathology
  • RNA, Ribosomal, 28S/genetics
  • Animals
  • Humans
  • Tumor Suppressor Protein p53/genetics*
  • Disease Models, Animal
  • Ribosomes/genetics*
  • Ribosomes/pathology
  • Polynucleotide 5'-Hydroxyl-Kinase/biosynthesis*
  • Polynucleotide 5'-Hydroxyl-Kinase/genetics
(all 15)
PubMed
26624285 Full text @ PLoS Genet.
Abstract
Ribosome biogenesis is a ubiquitous and essential process in cells. Defects in ribosome biogenesis and function result in a group of human disorders, collectively known as ribosomopathies. In this study, we describe a zebrafish mutant with a loss-of-function mutation in nol9, a gene that encodes a non-ribosomal protein involved in rRNA processing. nol9sa1022/sa1022 mutants have a defect in 28S rRNA processing. The nol9sa1022/sa1022 larvae display hypoplastic pancreas, liver and intestine and have decreased numbers of hematopoietic stem and progenitor cells (HSPCs), as well as definitive erythrocytes and lymphocytes. In addition, ultrastructural analysis revealed signs of pathological processes occurring in endothelial cells of the caudal vein, emphasizing the complexity of the phenotype observed in nol9sa1022/sa1022 larvae. We further show that both the pancreatic and hematopoietic deficiencies in nol9sa1022/sa1022 embryos were due to impaired cell proliferation of respective progenitor cells. Interestingly, genetic loss of Tp53 rescued the HSPCs but not the pancreatic defects. In contrast, activation of mRNA translation via the mTOR pathway by L-Leucine treatment did not revert the erythroid or pancreatic defects. Together, we present the nol9sa1022/sa1022 mutant, a novel zebrafish ribosomopathy model, which recapitulates key human disease characteristics. The use of this genetically tractable model will enhance our understanding of the tissue-specific mechanisms following impaired ribosome biogenesis in the context of an intact vertebrate.
Genes / Markers
Figures
Figure Gallery (18 images) / 2
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Expression
Phenotype
Mutations / Transgenics
Allele Construct Type Affected Genomic Region
jh1TgTransgenic Insertion
    jh2TgTransgenic Insertion
      la2TgTransgenic Insertion
        sa1022
          Point Mutation
          zdf1
            Point Mutation
            zf169TgTransgenic Insertion
              1 - 6 of 6
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              Human Disease / Model
              No data available
              Sequence Targeting Reagents
              Target Reagent Reagent Type
              nol9MO1-nol9MRPHLNO
              1 - 1 of 1
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              Fish
              Antibodies
              Name Type Antigen Genes Isotypes Host Organism
              Ab1-gcgmonoclonal
                IgG1Mouse
                Ab1-inspolyclonalGuinea pig
                Ab2-cpa1polyclonal
                  Rabbit
                  Ab3-sstpolyclonal
                    Rabbit
                    Ab4-krt18monoclonal
                      IgG1Mouse
                      1 - 5 of 5
                      Show
                      Orthology
                      No data available
                      Engineered Foreign Genes
                      Marker Marker Type Name
                      EGFPEFGEGFP
                      mCherryEFGmCherry
                      1 - 2 of 2
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                      Mapping
                      No data available