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Updated: Mar 9, 2026

Genome-wide Analysis using ChIP to Identify Isoform-specific Gene Targets
Published on: July 7, 2010
RNA synthesis is associated with multiple TBP-chromatin binding events
Hussain A Zaidi1, David T Auble1, Stefan Bekiranov1
1Department of Biochemistry and Molecular Genetics, University of Virginia School of Medicine, Charlottesville, VA 22908, USA.
Competition ChIP measures transcription factor (TF) turnover. This study models TF-chromatin binding to find TATA-binding protein (TBP) residence times, revealing multiple binding events per RNA molecule.
Area of Science:
- Molecular Biology
- Biophysics
- Genomics
Background:
- Transcription factors (TFs) regulate gene expression by binding to chromatin.
- Understanding TF dynamics is crucial for deciphering gene regulation.
- Competition ChIP is an emerging technique for measuring TF turnover.
Purpose of the Study:
- To develop a physical model for TF-chromatin competitive binding.
- To determine the residence time of TATA-binding protein (TBP) on yeast chromatin.
- To assess the temporal resolution of the competition ChIP method.
Main Methods:
- Development of a physical model based on chemical reaction rate theory.
- Application of the model to competition ChIP data from yeast.
- Explicit inclusion of competitor induction profiles in the modeling.
Main Results:
- Estimated TBP-chromatin residence times as short as 1.3 minutes.
- Demonstrated competition ChIP as a high temporal-resolution technique.
- Found a median of ~5 TBP-chromatin binding events per RNA molecule synthesized at Pol II genes.
Conclusions:
- Competition ChIP provides high temporal resolution for TF dynamics.
- Yeast TBP exhibits dynamic binding and unbinding at gene promoters.
- Multiple pre-initiation complex assemblies may precede Pol II gene transcription.
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