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• W2463061005 abstract "We studied the transcriptional response to an increase in DNA supercoiling in Streptococcus pneumoniae by using seconeolitsine, a new topoisomerase I inhibitor. A homeostatic response allowing recovery of supercoiling was observed in cells treated with subinhibitory seconeolitsine concentrations. Supercoiling increases of 40.7% (6 μM) and 72.9% (8 μM) were lowered to 8.5% and 44.1%, respectively. Likewise, drug removal facilitated the recovery of cell viability and DNA-supercoiling. Transcription of topoisomerase I depended on the supercoiling level. Also specific binding of topoisomerase I to the gyrase A gene promoter was detected by chromatin-immunoprecipitation. The transcriptomic response to 8 μM seconeolitsine had two stages. An early stage, associated to an increase in supercoiling, affected 10% of the genome. A late stage, manifested by supercoiling recovery, affected 2% of the genome. Nearly 25% of the early responsive genes formed 12 clusters with a coordinated transcription. Clusters were 6.7-31.4 kb in length and included 9-22 responsive genes. These clusters partially overlapped with those observed under DNA relaxation, suggesting that bacteria manage supercoiling stress using pathways with common components. This is the first report of a coordinated global transcriptomic response that is triggered by an increase in DNA supercoiling in bacteria." @default.
• W2463061005 created "2016-07-22" @default.
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• W2463061005 date "2016-07-04" @default.
• W2463061005 modified "2023-10-14" @default.
• W2463061005 title "An increase in negative supercoiling in bacteria reveals topology-reacting gene clusters and a homeostatic response mediated by the DNA topoisomerase I gene" @default.
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• W2463061005 doi "https://doi.org/10.1093/nar/gkw602" @default.
• W2463061005 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5009749" @default.
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