The role of KRAB proteins in inflammation is essentially unknown; however, genomic studies indicate that inflammatory signaling increases accessibility of large sections of the genome [ 56].
Most previous work in this area has focused on polymers or monolayers which preclude control of signal density and accessibility in the nanoscale filamentous environment of natural matrices.
Indeed, only two general transcription factors (in H1-hESC) predict expression better than the chromatin accessibility signal (Pol2, p = 0.003, and Taf1, p = 0.0002, by Wilcoxon rank-sum test).
Probabilistic inference of differential expression and differential accessibility signals.
Maki, K., Nagata, K., Kitamura, F., Takemori, T. & Karasuyama, H. Immunoglobulin β signaling regulates locus accessibility for ordered immunoglobulin gene rearrangements.
Inhibition of TGFβ and Wnt signaling affects chromatin accessibility (Mohamed et al., 2016).
Peaks can be viewed as locations of chromatin features and DNase I hypersensitive sites, respectively, and the values of DNase-seq signals represent chromatin accessibility.
These findings demonstrate that the ability of 8E7 to accurately capture evidence of Wnt signaling in cells or tissues critically depends on the strength and/or duration of the Wnt signal, relative to the accessibility of this background antigen.
We speculate that the chromatin structure of 3' intron-exon boundaries in these genes could carry a signal that enhances the accessibility of the enzymatic machinery that mediates H2B ubiquitylation (Rad6-Bre1) [ 27, 28].
Spatial distribution and accessibility of signaling proteins on the plasma membrane can potentially have profound effects on the outcome of signaling.
