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Two genes have been implicated in leukemias of patients with abnormalities of chromosome 3, band q26: EVI1, which can be activated over long distances by chromosomal rearrangements involving 3q26, and EAP, a ribosomal gene that fuses with AML1 in a therapy-related myelodysplasia patient with a t(3;21)(q26.2;q22). AML1 was identified by its involvement in the t(8;21)(q22;q22) of acute myeloid leukemia. Here we report the consistent identification of fusion transcripts between AML1 and EAP or between AML1 and previously unidentified sequences that we named MDS1 (MDS-associated sequences) in the leukemic cells of four patients with therapy-related myelodysplasia/acute myeloid leukemia and in one patient with chronic myelogenous leukemia in blast crisis, all of whom had a t(3;21). In addition, we have identified a third chimeric transcript, AML1/EVI1, in one of the therapy-related acute myeloid leukemia patients. Pulsed-field gel electrophoresis established the order of the genes as EAP, the most telomeric, and EVI1, the most centromeric, gene. The results indicate that translocations could involve multiple genes and affect gene expression over long distances.

proceedings of the national academy of sciences of the united states of america

Consistent intergenic splicing and production of multiple transcripts between AML1 at 21q22 and unrelated genes at 3q26 in (3;21)(q26;q22) translocations.