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Updated: Sep 15, 2025
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Author Spotlight: An Integrated Workflow to Study the Promoter-Centric Spatio-Temporal Genome Architecture in Scarce Cell Populations
Published on: April 21, 2023
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Promoter strength and position govern promoter competition
Mervenaz Koska1,2, Tomek Swigut1, Alistair Nicol Boettiger2
1Department of Chemical and Systems Biology, Stanford University, Stanford, CA 94305, USA.
Biorxiv : the Preprint Server for Biology
|July 14, 2025
Summary
Promoter competition, where one promoter weakens another, is influenced by promoter strength and transcript length. This study reveals key rules governing how promoters compete, impacting gene expression.
Area of Science:
- Gene regulation
- Molecular biology
- Genomics
Background:
- Promoter competition is crucial in development and disease but its underlying mechanisms remain unclear.
- Understanding promoter competition is vital for deciphering gene regulatory networks.
Purpose of the Study:
- To systematically investigate the factors that determine promoter competition.
- To elucidate the rules governing how inserted promoters affect endogenous gene activity.
Main Methods:
- Utilized a synthetic platform to insert diverse promoters into the Sox2 locus.
- Quantified the impact of inserted promoters on endogenous Sox2 transcription.
- Assessed the role of transcript length, genomic location, and HUSH complex in competition.
Main Results:
- Reduced endogenous Sox2 transcription correlated with inserted promoter strength.
- Competition intensity increased with longer transcripts from inserted promoters.
- Promoter competition was location-dependent but independent of cohesin-mediated loop extrusion.
- The HUSH complex was found to silence inserted promoters, counteracting competition.
Conclusions:
- Established rules for promoter competition, demonstrating its role in fine-tuning gene expression.
- Highlighted the potential role of RNA transcripts in mediating promoter competition.
- Identified HUSH-mediated silencing as a factor that modulates promoter competition.
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