PUBLICATION

Transferrin-a modulates hepcidin expression in zebrafish embryos

Authors
Fraenkel, P.G., Gibert, Y., Holzheimer, J.L., Lattanzi, V.J., Burnett, S.F., Dooley, K.A., Wingert, R.A., and Zon, L.I.
ID
ZDB-PUB-081203-35
Date
2009
Source
Blood   113(12): 2843-2850 (Journal)
Registered Authors
Dooley, Kim, Fraenkel, Paula, Gibert, Yann, Wingert, Rebecca, Zon, Leonard I.
Keywords
none
MeSH Terms
  • Amino Acid Sequence
  • Anemia, Hypochromic/chemically induced
  • Anemia, Hypochromic/embryology
  • Anemia, Hypochromic/genetics
  • Animals
  • Antimicrobial Cationic Peptides/biosynthesis*
  • Antimicrobial Cationic Peptides/genetics
  • Cation Transport Proteins/genetics
  • Embryo, Nonmammalian/drug effects
  • Embryo, Nonmammalian/metabolism
  • Erythropoiesis/drug effects
  • Erythropoiesis/genetics
  • Gene Expression Regulation, Developmental/drug effects
  • Gene Expression Regulation, Developmental/physiology*
  • Gene Knockdown Techniques
  • Hepcidins
  • Humans
  • Iron/metabolism*
  • Iron/pharmacology
  • Molecular Sequence Data
  • Mutation
  • Organ Specificity
  • Phenylhydrazines/toxicity
  • Receptors, Transferrin/antagonists & inhibitors
  • Receptors, Transferrin/genetics
  • Receptors, Transferrin/physiology
  • Sequence Alignment
  • Sequence Homology, Amino Acid
  • Species Specificity
  • Transferrin/deficiency
  • Transferrin/genetics
  • Transferrin/physiology*
  • Zebrafish/embryology
  • Zebrafish Proteins/biosynthesis
  • Zebrafish Proteins/deficiency
  • Zebrafish Proteins/genetics
  • Zebrafish Proteins/physiology*
PubMed
19047682 Full text @ Blood
Abstract
The iron regulatory hormone hepcidin is transcriptionally upregulated in response to iron loading, but the mechanisms by which iron levels are sensed are not well understood. Large-scale genetic screens in the zebrafish have resulted in the identification of hypochromic anemia mutants with a range of mutations affecting conserved pathways in iron metabolism and heme synthesis. We hypothesized that transferrin plays a critical role both in iron transport and in regulating hepcidin expression in zebrafish embryos. Here we report the identification and characterization of the zebrafish hypochromic anemia mutant, gavi, which exhibits transferrin-deficiency due to mutations in transferrin-a. Morpholino knockdown of transferrin-a in wild type embryos reproduced the anemia phenotype and decreased somite and terminal gut iron staining, while co-injection of transferrin-a cRNA partially restored these defects. Embryos with transferrin-a or transferrin receptor 2 (TfR2) deficiency exhibited low levels of hepcidin expression, however anemia, in the absence of a defect in the transferrin pathway, failed to impair hepcidin expression. These data indicate that transferrin-a transports iron and that hepcidin expression is regulated by a transferrin-a-dependent pathway in the zebrafish embryo.
Genes / Markers
Figures
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Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Antibodies
Orthology
Engineered Foreign Genes
Mapping