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2017 ; 45
(4
): 1805-1819
Nephropedia Template TP
gab.com Text
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English Wikipedia
Role of the chromatin landscape and sequence in determining cell type-specific
genomic glucocorticoid receptor binding and gene regulation
#MMPMID27903902
Love MI
; Huska MR
; Jurk M
; Schöpflin R
; Starick SR
; Schwahn K
; Cooper SB
; Yamamoto KR
; Thomas-Chollier M
; Vingron M
; Meijsing SH
Nucleic Acids Res
2017[Feb]; 45
(4
): 1805-1819
PMID27903902
show ga
The genomic loci bound by the glucocorticoid receptor (GR), a hormone-activated
transcription factor, show little overlap between cell types. To study the role
of chromatin and sequence in specifying where GR binds, we used Bayesian modeling
within the universe of accessible chromatin. Taken together, our results
uncovered that although GR preferentially binds accessible chromatin, its binding
is biased against accessible chromatin located at promoter regions. This bias can
only be explained partially by the presence of fewer GR recognition sequences,
arguing for the existence of additional mechanisms that interfere with GR binding
at promoters. Therefore, we tested the role of H3K9ac, the chromatin feature with
the strongest negative association with GR binding, but found that this
correlation does not reflect a causative link. Finally, we find a higher
percentage of promoter-proximal GR binding for genes regulated by GR across cell
types than for cell type-specific target genes. Given that GR almost exclusively
binds accessible chromatin, we propose that cell type-specific regulation by GR
preferentially occurs via distal enhancers, whose chromatin accessibility is
typically cell type-specific, whereas ubiquitous target gene regulation is more
likely to result from binding to promoter regions, which are often accessible
regardless of cell type examined.