Mapping DNA sequence to transcription factor binding energy in vivo

Area of Science:

• Molecular Biology
• Systems Biology
• Biophysics

Background:

• Transcriptional regulation is crucial but understanding gene networks and cellular mechanisms remains challenging.
• Quantifying transcription factor (TF) and RNA polymerase binding energetics in vivo is difficult.

Purpose of the Study:

• To develop a strategy for dissecting transcriptional regulatory sequences using in vivo methods.
• To create quantitative models mapping DNA sequence to TF-DNA binding energy.
• To explore the relationship between sequence-energy mapping and transcriptional regulation mechanisms.

Main Methods:

• Utilized in vivo massively parallel reporter assays (MPRAs).
• Formulated quantitative models to predict TF-DNA binding energy from DNA sequence.
• Validated models by predicting binding energies within 1 kBT of measured values.

Main Results:

• Achieved high accuracy in predicting TF-DNA binding energies.
• Demonstrated the utility of sequence-energy mapping for designing specific gene induction responses.
• Showcased the ability to analyze effects of amino acid mutations on DNA sequence preference.
• Determined how regulatory context influences TF sequence specificity.

Conclusions:

• The developed strategy and quantitative models provide a powerful tool for dissecting transcriptional regulation.
• This approach enables precise prediction and design of gene regulatory functions in vivo.
• Advances the understanding of biophysical mechanisms underlying transcriptional control.