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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Retroviral insertional mutagenesis in murine promonocytic leukemias: c-myb and Mml1.

Studies have focused on two genetic loci, c-myb and Mml1, whose activation by retroviral insertional mutagenesis contribute to promonocytic leukemia in our acute monocytic leukemia (AMoL) model. Multiple mechanisms of activation of c-myb by retroviral insertional mutagenesis implicate both transcriptional deregulation and protein truncation in conversion of this proto-oncogene to an oncogene. Because transformation by c-Myb can be viewed as a block to differentiation our studies moved into two in vitro systems to evaluate effects of truncated forms of c-Myb on cytokine induced maturation of myeloid progenitors to the granulocyte and macrophage lineages. Deregulated expression of truncated and full length c-Myb did not result in maintenance of the myelomonocytic progenitor state but rather a block in differentiation at intermediate to late steps in the maturation processes of myelomonocytic cells. Our results argue that inhibition of differentiation is due to c-Myb's ability to maintain the proliferative state of cells. Interestingly, the phenotype of continuously proliferating monocytic cells resembles that of the tumor cell phenotype. Recently we identified a new target of integration, Mml1, which is rearranged in ten promonocytic leukemias that do not have c-myb rearrangements. This locus which was mapped to chromosome 10 is presently being characterized.[1]


  1. Retroviral insertional mutagenesis in murine promonocytic leukemias: c-myb and Mml1. Wolff, L., Koller, R., Bies, J., Nazarov, V., Hoffman, B., Amanullah, A., Krall, M., Mock, B. Curr. Top. Microbiol. Immunol. (1996) [Pubmed]
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