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• W1998897876 abstract "The recent explosion in our knowledge of how chromatin organization modulates gene transcription has highlighted the importance of epigenetic mechanisms in the initiation and progression of human cancer. These epigenetic changes--in particular, aberrant promoter hypermethylation that is associated with inappropriate gene silencing--affect virtually every step in tumor progression. Intriguingly, methylation patterns are severely altered in tumors, with an overall hypomethylation of the genome and hypermethylation of islands of CpGs clusters within specific DNA regions. Though overexpression of DNA methyltransferases (DNMTs) has been proposed to be a mechanism for aberrant genome methylation, it does not explain the specific regional hypermethylation in cancer cells. We have analyzed the role of chromatin modifying activities in cell transformation using acute promyelocytic leukemia as a model system. This disease is caused by expression of the PML-RARalpha fusion protein, thus offering the opportunity of studying the mechanisms of leukemogenesis through molecular investigation of the activity of the directly transforming protein. Recent evidence suggests that PML-RARalpha as well as other leukemia-associated fusion proteins induce changes in the chromatin structure. Specifically, aberrant recruitment of different chromatin modifying enzymes to specific promoters induces DNA hypermethylation and heterochromatin formation, which consequentially leads to the transcriptional silencing of that genes. Importantly, these epigenetic modifications were found to contribute to the leukemogenic potential of PML-RARalpha. These observations suggest that epigenetic alterations could actively contribute to the development of APL and other hyperproliferative diseases." @default.
• W1998897876 created "2016-06-24" @default.
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• W1998897876 date "2004-09-01" @default.
• W1998897876 modified "2023-10-06" @default.
• W1998897876 title "Epigenetic gene silencing in acute promyelocytic leukemia" @default.
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• W1998897876 doi "https://doi.org/10.1016/j.bcp.2004.05.041" @default.
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