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Ratio of mutant JAK2-V617F to wild-type Jak2 determines the MPD phenotypes in transgenic mice

Open access
Tiedt, Ralph, Hao-Shen, Hui, Sobas, Marta A., Looser, Renate, Dirnhofer, Stephan, Schwaller, Jürg, Skoda, Radek C.·2008·Blood

Abstract

An acquired somatic mutation in the JAK2 gene (JAK2-V617F) is present in the majority of patients with myeloproliferative disorders (MPDs). Several phenotypic manifestations (polycythemia vera [PV], essential thrombocythemia [ET], and primary myelofibrosis) can be associated with the same mutation. We generated JAK2-V617F transgenic mice using a human JAK2 gene with the sequences encoding the kinase domain placed in the inverse orientation and flanked by antiparallel loxP sites. Crossing mice of one transgenic line (FF1) with transgenic mice expressing Cre-recombinase under the control of the hematopoiesis specific Vav promoter led to expression of JAK2-V617F that was lower than the endogenous wild-type Jak2. These mice developed a phenotype resembling ET with strongly elevated platelet counts and moderate neutrophilia. Induction of the JAK2-V617F transgene with the interferon-inducible MxCre resulted in expression of JAK2-V617F approximately equal to wild-type Jak2 and a PV-like phenotype with increased hemoglobin, thrombocytosis, and neutrophilia. Higher levels of JAK2-V617F in mouse bone marrow by retroviral transduction caused a PV-like phenotype without thrombocytosis. These data are consistent with the hypothesis that the ratio of mutant to wild-type JAK2 is critical for the phenotypic manifestation. A similar correlation was also found in patients with MPD.

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Metadata

Authors
Tiedt, R., Hao-Shen, H., Sobas, M. A., Looser, R., Dirnhofer, S., Schwaller, J., & Skoda, R. C.
Venue
Blood
Published
2008-04-15
Volume
111
Issue
8
Pages
3931-3940
ISSN
  • 0006-4971 (ISSN-L)
  • 1528-0020
OpenAlex
W2038195476
Cited by
440
References
37
FWCI
17.63
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: Ratio of mutant JAK2-V617F to wild-type Jak2 determines the MPD phenotypes in transgenic mice. https://app.cochat.ai/papers/10.1182/blood-2007-08-107748
The paper
Tiedt, R., Hao-Shen, H., Sobas, M. A., Looser, R., Dirnhofer, S., Schwaller, J., & Skoda, R. C. (2008). Ratio of mutant JAK2-V617F to wild-type Jak2 determines the MPD phenotypes in transgenic mice. Blood. https://doi.org/10.1182/blood-2007-08-107748

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