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[ÇóÖú] DNA methylation-associated silencing of tumor-suppressor microRNAs in cancer

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1 Considering  the  genomic  rearrangements, copy-number alterations and translocations that many cancer cells suffer and that give rise to altered levels of
the transcripts, changes in the tumoral cell phenotype can be due not only to the protein alteration itself, but also to global RNA deregulation by altered competition
for miRNAs

2 This  mechanism  creates  a feedback relationship taking into account that miR-103/107  are  both  generated  by  and  regulators  of  Dicer, producing a downscaling of Dicer levels but not their complete depletion, maintaining a basal level to regulate the  miRNA  pathway.

3 iRNAs  transcribed  from  CpG islands undergo DNA methylation-associated repression with a similar chromatin context to coding genes, such as binding of the transcriptional repressor methyl-CpG-binding   domain   proteins   (Lujambio   et   al.,   2007; Urdinguio  et  al.,  2010),  and  a  histone  modification profile associated with silencing, such as in the case of loss of acetylation of histones H3 and H4 (Lujambio et al., 2007; Toyota et al., 2008).

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1 Considering  the  genomic  rearrangements, copy-number alterations and translocations that many cancer cells suffer and that give rise to altered levels of
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