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Author Spotlight: An Integrated Workflow to Study the Promoter-Centric Spatio-Temporal Genome Architecture in Scarce Cell Populations
Published on: April 21, 2023
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Signal integration by the CYP1A1 promoter--a quantitative study
Pascal Schulthess1, Alexandra Löffler2, Silvia Vetter2
1Institute for Pathology, Charité - Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, Germany Integrative Research Institute for the Life Sciences and Institute for Theoretical Biology, Humboldt University of Berlin, Philippstr. 13, 10115 Berlin, Germany.
Nucleic Acids Research
|May 3, 2015
Summary
This study reveals how the aryl hydrocarbon receptor (AhR) and Wnt/β-catenin pathways control liver gene expression. Mathematical modeling and reporter assays deciphered the promoter logic behind Cytochrome P450 1A1 (CYP1A1) zonation.
Area of Science:
- Molecular biology
- Systems biology
- Biophysics
Background:
- Detoxification genes display complex liver expression patterns.
- Cytochrome P450 1A1 (CYP1A1) expression is zonated, influenced by aryl hydrocarbon receptor (AhR) and Wnt/β-catenin signaling.
- Mechanisms of AhR and Wnt/β-catenin pathway crosstalk in gene regulation remain unclear.
Purpose of the Study:
- To elucidate the regulatory mechanisms of CYP1A1 gene expression.
- To quantify the influence of transcription factor binding sites on gene induction.
- To understand the role of AhR and Wnt/β-catenin signaling crosstalk in liver zonation.
Main Methods:
- Utilized 29 mutant constructs of the human CYP1A1 promoter.
- Developed a mathematical model integrating Wnt/β-catenin and AhR signaling with promoter statistical mechanics.
- Employed combinatorial reporter assays.
Main Results:
- Systematically quantified the regulatory impact of transcription factor binding sites on CYP1A1 promoter activity.
- Unveiled cooperative binding site interactions and promoter logic.
- Quantitatively predicted two-dimensional stimulus-response curves.
- Demonstrated the critical role of AhR and Wnt/β-catenin signaling crosstalk in liver zonation.
Conclusions:
- Statistical mechanical modeling and reporter assays can disentangle complex promoter logic.
- Crosstalk between AhR and Wnt/β-catenin signaling is essential for understanding liver lobule gene expression patterns.
- The study provides a quantitative framework for dissecting gene regulation in physiological contexts.
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