Abstract
Cytogenic changes are becoming increasingly important in understanding the pathogenesis of human malignancies. The t(9;22) (q34 ;ql1) translocation is one of the most consistent and generates the Philadelphia chromosome (Ph1) (ref. 1) in chronic myeloid leukaemia (CML); it has also been observed in some acute lymphoblastic leukaemias (ALL) (ref. 2). In CML the breakpoints occur on chromosome 22 in the region designated bcr (ref. 3) and result in the expression of a bcr–abl fusion product of relative molecular mass (MT) 210,000 (210K) with associated in vitro tyrosine kinase activity4 (P210bcr–abl). In some cases of Ph1-positive ALL, a novel abl-related protein (P190all–abl) of 190K has been shown5–7 to have tyrosine kinase activity. In this report we demonstrate that the Pl90all–abl protein has a bcr determinant from the amino-terminal region, but is lacking a bcr determinant normally found in the P210bcr–abl near the bcr-abl junction. The chimaeric nature of the P190all–abl was confirmed by sequential immunoprecipitation with antisera against abl and bcr peptides.
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Walker, L., Ganesan, T., Dhut, S. et al. Novel chimaeric protein expressed in Philadelphia positive acute lymphoblastic leukaemia. Nature 329, 851–853 (1987). https://doi.org/10.1038/329851a0
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DOI: https://doi.org/10.1038/329851a0
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