Regulatory Mechanisms for Transcriptional Bursting Revealed by an Event-Based Model
Renjie Wu1, Bangyan Zhou1, Wei Wang1,2
1National Laboratory of Solid State Microstructures, Department of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, P. R. China.
Research (Washington, D.C.)
|September 18, 2024
Summary
This study identifies 6 core transcriptional events that control gene bursting. Understanding these events reveals how regulators like transcription factors modulate gene expression dynamics and noise.
Area of Science:
- Molecular Biology
- Genetics
- Systems Biology
Background:
- Gene transcription occurs in bursts, making regulatory mechanisms challenging to study.
- Limited experimental data complicates the understanding of transcriptional bursting.
Purpose of the Study:
- To categorize gene states and identify essential transcriptional events.
- To unravel how regulators modulate transcriptional bursting dynamics.
- To understand the control of gene expression sensitivity, specificity, and noise.
Main Methods:
- Categorization of eukaryotic gene states.
- Identification of 6 essential transcriptional events and their state transitions.
- Analytical derivation and numerical simulation of transcriptional kinetics.
- Association of kinetics with event durations and recurrence probabilities.
Main Results:
- Transcriptional bursting is a sequence of 4 core events with variable configurations.
- Key state transitions influencing transcriptional sensitivity, specificity, and noise were identified.
- Global constraints on intrinsic transcriptional noise were revealed.
- Major regulatory modes for individual genes and the genome were elucidated.
- Requirements for rapid gene induction upon stimulation were determined.
Conclusions:
- Transcriptional patterns are controlled by a limited set of shared transcriptional events.
- Promoter architecture and regulatory modes dictate these events.
- Biochemical reactions on different timescales shape event durations and order.
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