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Capturing the dynamic nascent transcriptome during acute cellular responses: The serum response.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Cell Biology

Background:

  • Dynamic gene expression regulation is crucial for cellular processes like cell cycle progression and stress responses.
  • Signal transduction pathways mediate these dynamic changes in gene expression.

Purpose of the Study:

  • To investigate early dynamic changes in the nascent transcriptome using serum stimulation as a model.
  • To apply the nascent RNA Bru-seq technique for genome-wide transcriptional analysis.

Main Methods:

  • Utilized serum stimulation in human fibroblasts as a cellular response paradigm.
  • Employed the nascent RNA Bru-seq technique to capture dynamic changes in the nascent transcriptome.
  • Analyzed genome-wide transcription dynamics within the first two hours of stimulation.

Main Results:

  • Observed diverse gene responses, including sustained, transient, and delayed induction or repression.
  • Found high similarity in dynamic patterns between induced and repressed genes, suggesting common signaling triggers.
  • Identified immediate transient induction of AP-1 transcription factor and circadian clock genes.
  • Reported rapid repression of DNA damage response and histone genes.
  • Demonstrated accelerated RNA polymerase II transcription of large genes, irrespective of induction status.

Conclusions:

  • The study provides a comprehensive genome-wide view of dynamic transcription patterns in response to serum stimulation.
  • Nascent RNA Bru-seq is effective for comprehensively capturing rapid and dynamic changes in the nascent transcriptome.
  • The findings suggest coordinated signaling mechanisms underlie both gene induction and repression.