We propose a stochastic model for gene transcription coupled to DNA supercoiling, where we incorporate the experimental observation that polymerases create supercoiling as they unwind the DNA helix and that these enzymes bind more favorably to regions where the genome is unwound. Within this model, we show that when the transcriptionally induced flux of supercoiling increases, there is a sharp crossover from a regime where torsional stresses relax quickly and gene transcription is random, to one where gene expression is highly correlated and tightly regulated by supercoiling. In the latter regime, the model displays transcriptional bursts, waves of supercoiling, and up regulation of divergent or bidirectional genes. It also predicts that topological enzymes which relax twist and writhe should provide a pathway to down regulate transcription.
FingerprintDive into the research topics of 'Stochastic Model of Supercoiling-Dependent Transcription'. Together they form a unique fingerprint.
- Deanery of Molecular, Genetic and Population Health Sciences - Personal Chair of Chromatin Biology
- MRC Human Genetics Unit
Person: Academic: Research Active