Self-fusion of the ALL 1 Gene

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Abstract
LEUKEMIA is a clonal malignancy of blood cells that usually involves the myeloid or lymphoid lineages. The origin of leukemia, like other forms of cancer, lies in gene defects that alter the normal programs of cellular differentiation, proliferation, or apoptosis. Using chromosomal rearrangements as a guidepost to the location of genes involved in hematologic malignancy, researchers have identified and molecularly characterized many leukemia genes during the last decade.1These studies have revealed some common genetic mechanisms for leukemogenesis, provided molecular tools for leukemia diagnosis and monitoring, and identified potential targets for a new generation of leukemia therapies. One of the most significant of these genetic findings involves theALL1gene, which participates in acute leukemias in 5% to 10% of children and adults. Like other leukemia genes,ALL1was discovered by its association with well-characterized chromosomal rearrangements. However, we have recently found that theALL1gene also participates in
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