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Genome-wide off-rates reveal how DNA binding dynamics shape transcription factor function
Wim J de Jonge1, Mariël Brok1, Philip Lijnzaad1
1Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands.
Molecular Systems Biology
|December 6, 2020
Summary
Researchers developed DIVORSEQ to measure protein-DNA interaction dynamics genome-wide. This method reveals how Abf1 off-rates influence gene transcription and chromatin organization in yeast.
Area of Science:
- Molecular Biology
- Genomics
- Biochemistry
Background:
- Protein-DNA interactions are crucial for cellular processes like transcription and replication, but their dynamics remain poorly understood due to limited genome-wide study methods.
- Investigating the kinetics of these interactions, specifically off-rates, is essential for a comprehensive understanding of gene regulation and chromatin organization.
Purpose of the Study:
- To develop and apply a novel method, DIVORSEQ (Determining In Vivo Off-Rates by SEQuencing), for measuring protein-DNA interaction off-rates across an entire genome.
- To investigate the genome-wide in vivo off-rates of the Saccharomyces cerevisiae chromatin organizing factor Abf1.
- To correlate Abf1 off-rates with functional characteristics at binding sites, including transcriptional dependency, nucleosome positioning, and RNA polymerase II roadblock efficiency.
Main Methods:
- Development of the DIVORSEQ technique for determining in vivo off-rates of protein-DNA interactions.
- Application of DIVORSEQ to simultaneously measure Abf1 off-rates at 191 genomic sites in Saccharomyces cerevisiae.
- Analysis of the relationship between measured off-rates and site-specific functional attributes.
Main Results:
- Successfully determined in vivo off-rates for the chromatin organizing factor Abf1 at 191 genomic locations in yeast.
- Abf1 residence times varied significantly, ranging from 4.2 to 33 minutes across different sites.
- Sites with distinct Abf1 off-rates were associated with varying functional roles, including transcriptional dependency, nucleosome positioning, and RNA polymerase II termination roadblock capability.
Conclusions:
- Abf1 off-rates play a significant role in modulating transcription factor function and influencing chromatin-associated processes.
- The DIVORSEQ method provides a powerful and meaningful approach for investigating protein-DNA binding dynamics on a genome-wide scale.
- Understanding protein-DNA interaction dynamics, particularly off-rates, offers new insights into gene regulation and chromatin organization.
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