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2016 ; 44
(15
): 7144-58
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HMGN proteins modulate chromatin regulatory sites and gene expression during
activation of naïve B cells
#MMPMID27112571
Zhang S
; Zhu I
; Deng T
; Furusawa T
; Rochman M
; Vacchio MS
; Bosselut R
; Yamane A
; Casellas R
; Landsman D
; Bustin M
Nucleic Acids Res
2016[Sep]; 44
(15
): 7144-58
PMID27112571
show ga
The activation of naïve B lymphocyte involves rapid and major changes in
chromatin organization and gene expression; however, the complete repertoire of
nuclear factors affecting these genomic changes is not known. We report that HMGN
proteins, which bind to nucleosomes and affect chromatin structure and function,
co-localize with, and maintain the intensity of DNase I hypersensitive sites
genome wide, in resting but not in activated B cells. Transcription analyses of
resting and activated B cells from wild-type and Hmgn(-/-) mice, show that loss
of HMGNs dampens the magnitude of the transcriptional response and alters the
pattern of gene expression during the course of B-cell activation; defense
response genes are most affected at the onset of activation. Our study provides
insights into the biological function of the ubiquitous HMGN chromatin binding
proteins and into epigenetic processes that affect the fidelity of the
transcriptional response during the activation of B cell lymphocytes.