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Updated: May 15, 2025
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Artificial RNA Polymerase II Elongation Complexes for Dissecting Co-transcriptional RNA Processing Events
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High-frequency transcription leads to rapid R-loop formation
Bradleigh Palmer1, Chun-Ying Lee2, Leya Yang2
1Department of Biophysics, Johns Hopkins University, Baltimore, Maryland, USA.
The Journal of Biological Chemistry
|April 18, 2025
Summary
Transcription frequency and rate, influenced by RNA polymerase and NTPs, control R-loop formation. This study reveals how transcription dynamics govern R-loop structures, impacting gene regulation.
Area of Science:
- Molecular Biology
- Genetics
- Biophysics
Background:
- R-loops are three-stranded nucleic acid structures formed during transcription.
- Previous work showed R-loops and G-quadruplexes upregulate transcription.
- The mechanism linking transcription activity to R-loop formation remained unclear.
Purpose of the Study:
- To investigate the kinetics of transcription and their impact on R-loop formation.
- To elucidate the mechanistic basis of R-loop generation during transcription.
Main Methods:
- Single-molecule Förster Resonance Energy Transfer (smFRET).
- Electrophoretic Mobility Shift Assay (EMSA).
- Stochastic simulation modeling.
Main Results:
- R-loop formation is regulated by transcription frequency and rate.
- Transcription rate is controlled by RNA polymerase concentration.
- NTP concentration influences the speed of R-loop formation.
- Gradual promoter opening duration is a plausible mechanism for R-loop generation.
- Transcription frequency is the primary determinant of R-loop formation.
Conclusions:
- Transcription dynamics intricately balance R-loop formation.
- This provides new insights into the structure-function relationship of R-loops.
- Understanding R-loop regulation is crucial for gene expression control.
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