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Najafova, Zeynab; Tirado-Magallanes, Roberto; Subramaniam, Malayannan; Hossan, Tareq; Schmidt, Geske; Nagarajan, Sankari; Baumgart, Simon J; Mishra, Vivek Kumar; Bedi, Upasana; Hesse, Eric; Knapp, Stefan; Hawse, John R; Johnsen, Steven A
Nucleic acids research, 01/2017, Letnik: 45, Številka: 1Journal Article
Proper temporal epigenetic regulation of gene expression is essential for cell fate determination and tissue development. The Bromodomain-containing Protein-4 (BRD4) was previously shown to control the transcription of defined subsets of genes in various cell systems. In this study we examined the role of BRD4 in promoting lineage-specific gene expression and show that BRD4 is essential for osteoblast differentiation. Genome-wide analyses demonstrate that BRD4 is recruited to the transcriptional start site of differentiation-induced genes. Unexpectedly, while promoter-proximal BRD4 occupancy correlated with gene expression, genes which displayed moderate expression and promoter-proximal BRD4 occupancy were most highly regulated and sensitive to BRD4 inhibition. Therefore, we examined distal BRD4 occupancy and uncovered a specific co-localization of BRD4 with the transcription factors C/EBPb, TEAD1, FOSL2 and JUND at putative osteoblast-specific enhancers. These findings reveal the intricacies of lineage specification and provide new insight into the context-dependent functions of BRD4.
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in: SICRIS
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