As MLL rearrangements in these patients can arise during in utero fetal hematopoiesis Gale et al. Despite these well-supported links between topoisomerase II action and MLLbcr breakage, several lines of evidence indicate that topoisomerase II is not essential for this process.
The striking disparity in the distribution of breakpoints associated with de novo vs. Results The study cohort To analyze the recombinome of the human MLL gene, prescreened acute leukemia samples were obtained from the above-mentioned centers from to However, caspase activation seems not to be required for MLL breakage and rearrangements in each cellular setting.
The majority of cases occur during the first 5 years after treatment of primary cancer Shivakumar et al. Translocation breakpoint junctions of a t 4; 11 and a t 9; 11 secondary leukemia patients were found to coincide with topoisomerase II sensitive sites, even though not consensus sequences, in the centromeric and telomeric MLLbcr fragment, respectively Lovett et al.
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Thus, targeted cleavage seems to govern downstream events. Many prestigious universities and colleges have caught their students turning in papers they bought from essay mills. Even though primarily known to be involved in targeted Ig gene maturation processes, AID has also been shown to exert unspecific genotoxic effects upon activation by estrogen Pauklin et al.
Other replication blocking insults may arise from environmental, nutritional, and life-style risk factors, as well as from therapeutic interventions such as chemo- and radiotherapies, i.
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