Abstract
Unusual MLL gene rearrangements were found in bone marrow cells of four patients with acute myeloid leukemia. A combination of conventional and molecular cytogenetic methods were used to describe translocations t(9;12;11)(p22;p13;q23), t(11;19)(q23;p13.3), and t(10;11)(p12;23) and inverted insertion ins(10;11)(p12;q23.3q23.1). Partial nontandem duplication of the MLL gene was identified by reverse transcriptase–polymerase chain reaction in all cases. The duplication, which included MLL exons 2 through 8–9, was interrupted by a cryptic insertion of one or two exons from the respective MLL partner gene: MLLT10, MLLT3, or MLLT1.
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