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Leukemogenic rearrangements at the mixed lineage leukemia gene (MLL)-multiple rather than a single mechanism [Elektronski vir]Gole, Boris, 1976- ; Wiesmüller, LisaDespite manifold efforts to achieve reduced-intensity and -toxicity regimens, secondary leukemia has remained the most severe side effect of chemotherapeutic cancer treatment. Rearrangements ... involving a short telomeric <1 kb region of the mixed lineage leukemia (MLL) gene are the most frequently observed molecular changes in secondary as well as infant acute leukemia. Due to the mode-of-action of epipodophyllotoxins and anthracyclines, which have widely been used in cancer therapy, and support from in vitro experiments, cleavage of this MLL breakpoint cluster hotspot by poisoned topoisomerase II was proposed to trigger the molecular events leading to malignant transformation. Later on, clinical patient data and cell-based studies addressing a wider spectrum of stimuli identified cellular stress signaling pathways, which create secondary DNA structures, provide chromatin accessibility, and activate nucleases other than topoisomerase II at the MLL. The MLL destabilizing signaling pathways under discussion, namely early apoptotic DNA fragmentation, transcription stalling, and replication stalling, may all act in concert upon infection-, transplantation-, or therapy-induced cell cycle entry of hematopoietic stem and progenitor cells (HSPCs), to permit misguided cleavage and error-prone DNA repair in the cell-of-leukemia-origin.Source: Frontiers in cell and developmental biology [Elektronski vir]. - ISSN 2296-634X (Vol. 3, art. 41, 2015, str. 1-13)Type of material - e-article ; adult, seriousPublish date - 2015Language - englishCOBISS.SI-ID - 94110721
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Gole, Boris, 1976- | 26010 |
Wiesmüller, Lisa | ![]() |
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