A high-throughput method to identify trans-activation domains within transcription factor sequences

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• Transcription factors (TFs) are critical regulators of gene expression.
• The functional trans-activation domains (tADs) of many TFs are not well-characterized.
• A systematic approach for identifying and functionally testing tADs is needed.

Purpose of the Study:

• To develop a novel high-throughput method for functional screening of TF tADs.
• To systematically identify and validate functional tADs across various TFs.
• To understand the characteristics and locations of functional tADs within TF sequences.

Main Methods:

• Developed and implemented a high-throughput screening method called tAD-seq.
• Pooled screening of thousands of candidate tADs from different TFs in parallel.
• Validation of identified tADs using individual luciferase assays.

Main Results:

• tAD-seq successfully identified functional tADs, which were validated by luciferase assays.
• Identified tADs can be located at arbitrary positions within TF sequences.
• Functional tADs can overlap with known DNA-binding domains and include repeat regions; even non-native reading frames yielded weak tAD activity.

Conclusions:

• tAD-seq provides a powerful tool for the systematic functional characterization of TF tADs.
• The findings reveal that functional tADs are short protein sequences with diverse locations and structures.
• This work facilitates a deeper understanding of TF function and gene regulation mechanisms.