The t(9;11)(p22;q23) is the most common chromosomal translocation in topoisomerase II inhibitor therapy-related acute myeloid leukemia (tAML). This translocation fuses the MLL and AF9 proto-oncogenes producing a novel chimeric protein. In order to gain insight into the mechanism generating the t(9;11) and to clarify the role topoisomerase II inhibition may play in that mechanism we have cloned and sequenced the breakpoints from four tAML patients with the t(9;11). This sequence analysis identifies topoisomerase II consensus binding sequences near or at the chromosome 11 and chromosome 9 breakpoints in all four patients. One patient also had the consensus binding sequence for the TRANSLIN DNA-binding protein at the 9p22 and 11q23 breakpoints. Our results further support a direct role for topoisomerase II in the genesis of these tAML translocations.
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