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Transcription factor hubs exhibit gene-specific properties that tune expression
Samantha Fallacaro1,2,3, Apratim Mukherjee2,3, Meghan A Turner4,5
1Department of Cell and Developmental Biology, Perelman School of Medicine, University of Pennsylvania; Philadelphia, PA 19104, USA.
Biorxiv : the Preprint Server for Biology
|April 28, 2025
Summary
Transcription factor hubs regulate gene expression. Their properties are gene-specifically tuned, not just nucleus-wide, impacting transcriptional output.
Area of Science:
- Molecular Biology
- Genetics
- Developmental Biology
Background:
- Gene expression control depends on transcription factors binding target sites.
- Transcription factor hubs are high-concentration microenvironments that promote transcription.
- Existing models consider hubs to have nucleus-wide emergent properties.
Purpose of the Study:
- To investigate gene-specific regulation of transcription factor hub formation.
- To challenge the global model of hub properties by examining gene-specific regulation.
Main Methods:
- Utilized high-resolution lattice light-sheet microscopy in Drosophila embryos.
- Examined hubs formed by the Dorsal transcription factor at reporter genes with varying enhancer compositions.
Main Results:
- The snail gene recruits long-lived, high-intensity hubs.
- The sog gene forms shorter-lived, lower-intensity hubs.
- The hunchback gene, lacking Dorsal binding sites, shows only transient hub interactions.
- Hub intensity and duration correlate with transcriptional burst amplitude, RNAPII loading, and output.
Conclusions:
- Transcription factor hub properties are locally tuned in a gene-specific manner.
- This gene-specific tuning regulates transcriptional kinetics, challenging global models of hub formation.
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