title: The JAK2 V617F mutation involves B- and T-lymphocyte lineages in a subgroup of patients with Philadelphia-chromosome negative chronic myeloproliferative disorders.
abstract: The JAK2 V617F mutation is a frequent genetic event in the three classical Philadelphia-chromosome negative chronic myeloproliferative disorders (Ph(neg.)-CMPD), polycythemia vera (PV), essential thrombocythemia (ET) and idiopathic myelofibrosis (IMF). Its occurrence varies in frequency in regards to phenotype. The mutation is found in the majority of patients with PV and about half of the patients with ET and IMF. These diseases are clonal stem cell disorders arising in an early stem cell progenitor. The level in the stem cell hierarchy on which the initiating genetic events and the JAK2 V617F mutation occurs is not known. The mutation has so far been detected in all cells of the myeloid lineage, whereas the potential clonal involvement of the lymphoid lineage is controversial. In this study, we detected the JAK2 V617F mutation by real-time quantitative PCR (qPCR) in both B-lymphocytes and T-lymphocytes in a subgroup of patients with Ph(neg.)-CMPDs. These results demonstrate the origin of the JAK2 V617F positive disorders in an early stem cell with both lymphoid and myeloid differentiation potential.
authors.affiliation: Haematology, Odense University Hospital, Odense, Denmark. thomas.stauffer.larsen@ouh.fyns-amt.dk
authors.forename: Thomas Stauffer
authors.initials: TS
authors.lastname: Larsen
authors.forename: Jacob Haaber
authors.initials: JH
authors.lastname: Christensen
authors.forename: Hans Carl
authors.initials: HC
authors.lastname: Hasselbalch
authors.forename: Niels
authors.initials: N
authors.lastname: Pallisgaard
mesh_terms: D000368:Aged; D001402:B-Lymphocytes / Q000473:pathology*; D004252:DNA Mutational Analysis / Q000379:methods; D005260:Female; D006801:Humans; D053614:Janus Kinase 2 / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D009154:Mutation; D009196:Myeloproliferative Disorders / Q000235:genetics* / Q000276:immunology; D010677:Philadelphia Chromosome; D011087:Polycythemia Vera / Q000235:genetics / Q000276:immunology; D016133:Polymerase Chain Reaction / Q000379:methods; D055728:Primary Myelofibrosis / Q000235:genetics / Q000276:immunology; D013601:T-Lymphocytes / Q000473:pathology*; D013920:Thrombocythemia, Essential / Q000235:genetics / Q000276:immunology
chemical_list: D053614:Janus Kinase 2