Rather, the rp promoters are tuned to respond to a combination of factors, including components of the general transcription machinery, a relatively small group of sequence-specific transcription factors, and modifiers of chromatin structure.
We can speculate that c-Myc and Klf4 act as modifiers of chromatin structure allowing Oct3/4 and Sox2 to bind their target genes that are normally silenced by epigenetic mechanisms in differentiated cells.
Nevertheless, it is intriguing that, by targeting post-translational modifiers of chromatin remodeling factors, we could influence whether they occupy genes that confer either oncogenic or tumor-suppressive properties.
This represents the most comprehensive and rigorous evaluation of the profiles of chromatin modifier enzymes in human cancers done to date.
The regulation of chromatin modifier Bmi1 by Twist1 was confirmed in AML cells enforced with Twist1 overexpression and indirectly affirmed by the strong positive correlation between their expression levels in primary AML samples.
The rationale to study the alterations of chromatin modifier genes in cancer samples and their respective normal tissues seemed obvious to us given the biology and the previous indications for their involvement in tumorigenesis.
Here we report characteristic patterns of expression of 12 members of 3 classes of chromatin modifier genes in 6 different cancer types: histone acetyltransferases (HATs)- EP300, CREBBP, and PCAF; histone deacetylases (HDACs)- HDAC1, HDAC2, HDAC4, HDAC5, HDAC7A, and SIRT1; and histone methyltransferases (HMTs)- SUV39H1and SUV39H1and
11 ChAM in PALB2 and MORF4L1, an interacting protein of PALB2, have been proposed to be modifiers of the chromatin-association of PALB2, whereas the damage-induced PALB2 focus formation has been found to be primarily modulated by BRCA1.
Chromatin modifiers of the BAF chromatin-remodelling complex regulate diverse genes including those involved in the inflammatory response [37], [38].
Interestingly, miRNAs can themselves act as epigenetic modifiers by the post-transcriptional regulation of chromatin modifying enzymes [38].
