A TEL-JAK2 fusion protein with constitutive kinase activity in human leukemia.
basic_science · Level V
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Abstract
The Janus family of tyrosine kinases (JAK) plays an essential role in development and in coupling cytokine receptors to downstream intracellular signaling events. A t(9;12)(p24;p13) chromosomal translocation in a T cell childhood acute lymphoblastic leukemia patient was characterized and shown to fuse the 3' portion of JAK2 to the 5' region of TEL, a gene encoding a member of the ETS transcription factor family. The TEL-JAK2 fusion protein includes the catalytic domain of JAK2 and the TEL-specific oligomerization domain. TEL-induced oligomerization of TEL-JAK2 resulted in the constitutive activation of its tyrosine kinase activity and conferred cytokine-independent proliferation to the interleukin-3-dependent Ba/F3 hematopoietic cell line.
Medical subject headings
- Leukemia-Lymphoma, Adult T-Cell
- Milk Proteins
- Oncogene Proteins, Fusion
- Protein-Tyrosine Kinases
- Proto-Oncogene Proteins
- Repressor Proteins