JAK2 clinical mutations cause myeloproliferative neoplasms and leukemia, and the mutations strongly concentrate in the regulatory pseudokinase domain Janus kinase homology (JH) 2.
While expression of mutant Jak2 was necessary for leukemia induction, neither its continued expression nor enzymatic activity was required to maintain leukemia survival and rapid proliferation.
Discovery of Janus Kinase 2 (JAK2) and Histone Deacetylase (HDAC) Dual Inhibitors as a Novel Strategy for the Combinational Treatment of Leukemia and Invasive Fungal Infections.
In particular, gain-of-function mutations in the <i>JAK</i> genes, most frequently, V617F in the pseudokinase domain of JAK2, have been mapped in patients with blood disorders, including myeloproliferative neoplasms and leukemias.
In approximately 60% of patients, the Janus kinase 2 gene is mutated, in 20%, the calreticulin gene is mutated, and in 5%, the myeloproliferative leukemia virus gene is mutated.
Supporting the notion that LT signalling plays a role in T-ALL, inactivation of Ltbr results in a significant delay in TEL-JAK2-induced leukaemia onset.
Having both a tyrosine kinase-activating rearrangement and genomic lesions affecting lymphoid transcription factors suggested that the leukemia was of the Philadelphia chromosome (Ph)/BCR-ABL1-like ALL subtype and that JAK2 inhibitors might be able to overcome this aggressive ALL with SPAG9-JAK2.
SHP1 negatively regulates the Janus kinase 2/signal transducer and activator of transcription (JAK2/STAT) signaling pathway, which is constitutively activated in myeloproliferative neoplasms (MPNs) and leukemia.
Continued research into how miRNAs impact JAK2(V617F) clonal expansion, differential haematopoiesis among different MPNs, disease progression and leukaemia transformation will lead to a better understanding of the development of these disorders, their clinical manifestations, and their treatment.
Constitutive activation of Janus kinase 2/signal transducers and activators of transcription (JAK2/STAT) signaling has an important role in the oncogenesis of myeloproliferative neoplasms (MPNs) and leukemia.
We previously showed that CD34⁺/CD38⁻ acute myelogenous leukemia (AML) cells, which contain leukemia stem cells, expressed a greater amount of the phosphorylated forms of JAK2 and STAT5 (p-JAK2 and p-STAT5) than their CD34⁺/CD38⁺ counterparts.
This study was conducted to investigate whether any association exists between genetic polymorphisms in the JAK2, STAT3 and STAT5 genes and individual susceptibility to leukemia.
To investigate the presence of mutations in the points most frequent for mutations (hotspot mutations) in phosphatidylinositol-3-kinase (PI3K), Janus kinase 2 (JAK2), FMS-like tyrosine kinase 3 (FLT3) and nucleophosmin (NPM1), which are involved in leukemia and other cancers, in a population of Brazilian MDS patients.
Mutations in the thrombopoietin receptor gene (myeloproliferative leukemia, MPL) have been reported in patients with JAK2V617F-negative chronic myeloproliferative disorders (MPDs).
Among the patients with myelofibrosis, those with ASXL1 lesions were not distinguished from their wild-type counterparts with regard to JAK2V617F status, exposure to chemotherapy or evolution to leukemia.
A search for additional mutations identified alterations of RUNX1, WT1, TP53, CBL, NRAS, and TET2, without significant differences between JAK2-mutant and wild-type leukemias.
Tauhese results identify a previously unrecognized nuclear role for JAK2 in the phosphorylation of H3Y41 and reveal a direct mechanistic link between two genes, jak2 and lmo2, involved in normal haematopoiesis and leukaemia.