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• W2157473345 abstract "Abstract In mice, the proviral integration of the Friend Spleen Focus Forming Virus (SFFV) within the PU.1 locus of erythroid precursors results in the development of erythroleukemia. SFFV integrates several kilobases upstream of the PU.1 transcription initiation start site leading to the constitutive activation of the gene which in turn results in a block of erythroid differentiation. In this study we have mapped and sequenced the exact location of the retroviral integration site. We have shown that SFFV integrates downstream of a previously described upstream regulatory element (URE), precisely 2,976 bp downstream of the URE-distal element. We have also found that SFFV persists integrated within the same location in resistant cell lines that have lost their differentiation capacity and in which case PU.1 remains silent. We have examined the methylation status of PU.1 and found that in resistant cells the nearby CpG islands remained methylated in contrast to a non-methylated status of the parental cell lines. Treatment with 5-aza-2′-deoxycytidine caused resistant cells to differentiate yet only when combined with HMBA. Altogether these results strongly suggest that methylation plays a crucial role with regard to PU.1 silencing. However, although demethylation is required, it is not sufficient to overcome the differentiation impasse. We have also showed that activation blockage of the Epo/Epo-R pathway remains despite of the absence of PU.1." @default.
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• W2157473345 date "2013-08-21" @default.
• W2157473345 modified "2023-10-17" @default.
• W2157473345 title "DNA methylation-mediated silencing of PU.1 in leukemia cells resistant to cell differentiation" @default.
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• W2157473345 doi "https://doi.org/10.1186/2193-1801-2-392" @default.
• W2157473345 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3758488" @default.
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