A novel heterozygous HIF2AM535I mutation reinforces the role of oxygen sensing pathway disturbances in the pathogenesis of familial erythrocytosis

Maurizio Martini, Luciana Teofili, Luigi Maria Larocca, Tonia Cenci, Lorenza Torti, Giuseppe Leone, Fiorina Giona, Massimiliano Rea, Robin Foà

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57 Citations (Scopus)

Abstract

HIF2A transcription factor plays a central role in the regulation of the hypoxia responding pathway in mammalian cells, by modulating erythropoiesis and angiogenesis. Molecular alterations of oxygen sensing pathway constituents are implicated in hereditary erythrocytosis. Here we show that 2 members of a family with idiopathic erythrocytosis exhibited a new heterozygous G to A mutation at base 1605 of the exon 12 of hypoxia-inducible factor-2A (HIF2A) gene. This mutation determines the replacement of methionine by isoleucine at the position 535, very close to the position 531, where the hydroxyl acceptor prolyne is located. In addition, we found that mRNA expression of erythropoietin receptor, vascular endothelial growth factor, transferrin receptor, adrenomedullin and N-myc downstream regulated gene 1, up-regulated by HIF2A or hypoxia, were significantly higher in patients carrying the mutation than in normal controls. These results suggest that the HIF2A(M535I) gene mutation could induce hereditary erythrocytosis at a young age.
Original languageEnglish
Pages (from-to)1068-1071
Number of pages4
JournalHaematologica
Volume93
DOIs
Publication statusPublished - 2008

Keywords

  • Adolescent
  • Adrenomedullin
  • Adult
  • Anoxia
  • Basic Helix-Loop-Helix Transcription Factors
  • Female
  • Gene Expression Regulation
  • Heterozygote
  • Humans
  • Male
  • Mutation
  • Oxygen
  • Polycythemia
  • Receptors, Transferrin
  • Vascular Endothelial Growth Factor A

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