In Vitro Genome-Wide Identification of Transcription Factor Binding Sites.

Area of Science:

• Molecular Biology
• Genomics
• Biotechnology

Background:

• Transcription factors (TFs) regulate gene expression by binding to specific DNA sequences.
• Understanding TF binding sites is crucial for deciphering gene regulatory networks.
• Current methods for profiling TF binding sites can be time-consuming and labor-intensive.

Purpose of the Study:

• To describe a streamlined protocol for preparing pre-PCR DNA affinity purification followed by sequencing (DAP-seq) libraries.
• To enable high-throughput profiling of transcription factor binding sites in vitro.
• To reduce the time and resources required for DAP-seq library preparation.

Main Methods:

• Expression and purification of recombinant transcription factors (TFs).
• Affinity purification of TF-bound genomic fragments using recombinant TFs.
• Preparation of sequencing-ready libraries from purified TF binding fragments.
• Parallel processing of up to 96 samples for DAP-seq library preparation.

Main Results:

• A robust protocol for preparing pre-PCR DAP-seq libraries for 96 TFs was established.
• The method successfully identifies TF binding sites in vitro.
• Up to 96 DAP-seq libraries can be prepared within a 2-day timeframe.

Conclusions:

• The described method significantly accelerates the generation of DAP-seq libraries.
• This protocol facilitates large-scale in vitro TF binding site analysis.
• The optimized workflow enhances the efficiency of genomic TF binding site discovery.