A unique clonal JAK2 mutation leading to constitutive signalling causes polycythaemia vera.

Authors: James, C  Ugo, V  Le Couedic, JP  Staerk, J  Delhommeau, F  Lacout, C  Garcon, L  Raslova, H  Berger, R  Bennaceur-Griscelli, A  Villeval, JL  Constantinescu, SN  Casadevall, N  Vainchenker, W 
Citation: James C, etal., Nature. 2005 Apr 28;434(7037):1144-8.
Pubmed: (View Article at PubMed) PMID:15793561
DOI: Full-text: DOI:10.1038/nature03546

Myeloproliferative disorders are clonal haematopoietic stem cell malignancies characterized by independency or hypersensitivity of haematopoietic progenitors to numerous cytokines. The molecular basis of most myeloproliferative disorders is unknown. On the basis of the model of chronic myeloid leukaemia, it is expected that a constitutive tyrosine kinase activity could be at the origin of these diseases. Polycythaemia vera is an acquired myeloproliferative disorder, characterized by the presence of polycythaemia diversely associated with thrombocytosis, leukocytosis and splenomegaly. Polycythaemia vera progenitors are hypersensitive to erythropoietin and other cytokines. Here, we describe a clonal and recurrent mutation in the JH2 pseudo-kinase domain of the Janus kinase 2 (JAK2) gene in most (> 80%) polycythaemia vera patients. The mutation, a valine-to-phenylalanine substitution at amino acid position 617, leads to constitutive tyrosine phosphorylation activity that promotes cytokine hypersensitivity and induces erythrocytosis in a mouse model. As this mutation is also found in other myeloproliferative disorders, this unique mutation will permit a new molecular classification of these disorders and novel therapeutical approaches.

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CRRD ID: 10449392
Created: 2015-12-28
Species: All species
Last Modified: 2015-12-28
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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.