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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 PMID27112571show 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.