A 2-es típusú Janus tirozin kináz Val617Phe aktiváló pontmutáció szerepe és kimutatásának jelentosége myeloproliferatív szindrómában

Hajnalka Andrikovics, Anikó Szilvási, Nóra Meggyesi, Viktória Király, Gabriella Halm, Sándor Lueff, Sarolta Nahajevszky, Gábor Mikala, Andrea Sipos, Nóra Lovas, Zoltán Csukly, Zoltán Mátrai, Júlia Tamáska, Attila Tordai, Tamás Masszi

Research output: Article

9 Citations (Scopus)

Abstract

The Val617Phe point mutation of Janus kinase 2 gene is believed to participate in the pathogenesis of myeloproliferative syndrome characterised by the clonal alteration of hematopoetic stem cells. According to current results, the frequency ofVal617Phe activating mutation is around 80% in polycythaemia vera, 35% in essential thrombocythaemia, and 50% in chronic idiopathic myelofibrosis. The diagnoses of polycythaemia vera, essential thrombocythaemia and idiopathic myelofibrosis were so far based on the exclusion of secondary factors as well as bone marrow biopsy histology. The goal of the present work was to establish simple molecular genetic techniques for the routine testing of Janus kinase 2 gene Val617Phe mutation, and to compare the clinical phenotypes ofVal617Phe mutation positive and negative myeloproliferative syndromes. We employed the allele specific polymerase chain technique for detection of Val617Phe mutation in 252 patients with myeloproliferative syndrome. We measured Val617Phe frequency as 85,4% (117/137) in polycytaemia vera, 56,6% (56/99) in essential thrombocythaemia, and 87,5% (14/16) in idiopathic myelofibrosis. We found significantly elevated hemoglobin levels and white blood cell counts (measured at the time of diagnosis) in Val617Phe-positive polycythaemia vera and essential thrombocythaemia patient groups compared to Val617Phe-negative patients. However, the frequencies of splenomegaly and other complications (thrombosis, bleeding, transformation to acute leukemia) were not significantly different between the mutation-positive and negative groups. In conclusion, the non-invasive mutation analysis of the Janus kinase 2 Val617Phe is suitable for routine laboratory application and helps the differential diagnosis of myeloproliferative syndrome. Althought the exact role of Val617Phe mutation testing has not yet been identified on the basis of a broad professional consensus, the testing is suggested in cases of erythrocytoses and thrombocytoses of unknown origin.

Original languageHungarian
Pages (from-to)203-210
Number of pages8
JournalOrvosi hetilap
Volume148
Issue number5
DOIs
Publication statusPublished - febr. 4 2007

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Keywords

  • Essential thrombocythaemia
  • Janus kinase 2
  • Myeloproliferative disorders
  • Polycythaemia vera
  • V617F

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Andrikovics, H., Szilvási, A., Meggyesi, N., Király, V., Halm, G., Lueff, S., Nahajevszky, S., Mikala, G., Sipos, A., Lovas, N., Csukly, Z., Mátrai, Z., Tamáska, J., Tordai, A., & Masszi, T. (2007). A 2-es típusú Janus tirozin kináz Val617Phe aktiváló pontmutáció szerepe és kimutatásának jelentosége myeloproliferatív szindrómában. Orvosi hetilap, 148(5), 203-210. https://doi.org/10.1556/OH.2007.27860