Quantitative analysis of the promoter occupancy and expression level induced by each PIF revealed an intriguing pattern.
Comparing TF occupancy with expression, we found strong association between allelic occupancy and expression within 100 bp of transcription start sites (TSSs), and weak association up to 100 kb from TSSs.
Here, we investigated PolII occupancy and expression of the associated genes across the active (Xa) and inactive (Xi) X chromosomes in human female cells to elucidate the relationship of gene expression and PolII binding.
However several studies suggest that as with transcription start sites (TSS), some transcription termination sites (TTS) acquire specific nucleosome positioning patterns that can be correlated with distinct polymerase occupancy and expression levels [23 26].
For the expression of Sso TFEβ, Sso TFEα/β and all the mutant versions of these proteins as well as hC62/39 in BL21 Star (DE3) 0.5 mM L-cysteine and 0.5 mM Ammonium ferric citrate were added after induction in order to maximize FeS cluster occupancy and expression was allowed for 2.5 hr.
Here, we present an assay for high-resolution measurements of both DNA occupancy and gene expression on large-scale libraries of systematically designed regulatory sequences.
The nucleosome level around a constitutive site negatively correlated with the gene expression, and there was a proportional relationship between RNAP II occupancy and gene expression.
This observation is in contrast with a previous finding in activated human T cells, where a negative correlation between nucleosome occupancy and transcript expression levels was reported both in vivo and by using nucleosome occupancy predictions based solely on DNA sequence as a proxy for the in vitro experiment [ 36].
Weak correlation between nucleosome occupancy and gene expression levels is, however, supported by our earlier observations in yeast, where most changes in gene expression were not accompanied by nucleosome remodeling in promoters and coding regions [ 58, 59].
Both the theoretical bandwidth occupancy and BER expressions for an OM-OFDM transmission are derived.
