Heterogeneity in the breakpoints of chromosome 19 among acute leukemia patients with the t(11;19)(q23;p13) translocation

Gene probes for insulin receptor (INSR) and c‐ets‐1 were hybridized to metaphase cells from three leukemic patients with the t(11;19)(q23;p13) translocation. Patients 1 and 2 were diagnosed as acute lymphocytic leukemia (ALL) (L2), and patient 3, as acute myelogenous leukemia (AML) (M4). The c‐ets‐1 gene was demonstrated to have translocated from chromosome 11 to the short arm of the rearranged chromosome 19 (19p+) in all three patients. On the other hand, the INSR gene translocated from chromosome 19 to the rearranged chromosome 11 (11q‐) in the AML case, but remained on the rearranged chromosome 19 in the two ALL cases. Thus, the breakpoints of chromosome 19 are different among the patients studied, proximal to the INSR gene locus in the AML case and distal in the two ALL cases. Consequently, the c‐ets‐1 gene and the INSR gene remain separated in the AML case, whereas they become close to each other in the two ALL cases. Rearrangement of these two genes was studied in the two ALL patients, with no positive data being obtained. The results suggest that there may be heterogeneity in the breakpoints of chromosome 19 among the t(11;19)‐associated acute leukemias.

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