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Langlais, David; Couture, Catherine; Balsalobre, Aurélio; Drouin, Jacques
Molecular cell, 07/2012, Letnik: 47, Številka: 1Journal Article
Transcription factor recruitment to genomic sites of action is primarily due to direct protein:DNA interactions. The subsequent recruitment of coregulatory complexes leads to either transcriptional activation or repression. In contrast to this canonical scheme, some transcription factors, such as the glucocorticoid receptor (GR), behave as transcriptional repressors when recruited to target genes through protein tethering. We have investigated the genome-wide prevalence of tethering between GR and Stat3 and found nonreciprocal interactions, namely that GR tethering to DNA-bound Stat3 results in transcriptional repression, whereas Stat3 tethering to GR results in synergism. Further, other schemes of GR and Stat3 corecruitment to regulatory modules result in transcriptional synergism, including neighboring and composite binding sites. The results indicate extensive transcriptional interactions between Stat3 and GR; further, they provide a genome-wide assessment of transcriptional regulation by tethering and a molecular basis for integration of signals mediated by GR and Stats in health and disease. ► Extensive cooperative genomic recruitment of GR and Stat3 ► Binding of GR and Stat3 to neighboring DNA sites results in transcriptional synergism ► Stat3 tethering to GR is associated with transcriptional synergism ► GR tethering to Stat3 is linked to trans-repression by GR
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