Optimization of CUT&Tag product recovery and library construction method

Area of Science:

• Epigenetics and Molecular Biology
• Genomics and Proteomics
• Biotechnology and Bioengineering

Background:

• Cleavage under target and tagment (CUT&Tag) is a simplified ChIP-Seq method for studying protein-DNA interactions.
• Post-tagment reaction DNA recovery is crucial for CUT&Tag library construction, with different methods impacting results.
• Optimizing DNA recovery is essential for improving CUT&Tag efficiency and data quality.

Purpose of the Study:

• To establish and evaluate a novel Streptavidin beads recovery CUT&Tag (srCUT&Tag) method.
• To compare the efficiency and data quality of srCUT&Tag against existing recovery methods.
• To assess the impact of different recovery methods on CUT&Tag results for various protein targets.

Main Methods:

• Development of the srCUT&Tag protocol for rapid and convenient DNA recovery after CUT&Tag tagmentation.
• Comparative analysis of srCUT&Tag, ethanol precipitation, SPRI magnetic bead recovery, and direct PCR methods.
• Application of CUT&Tag assays for H3K4me3, RNA Polymerase II (RNAPII), CTCF, and HMGA1 in K562 cells.

Main Results:

• srCUT&Tag and SPRI magnetic bead recovery demonstrated higher efficiency than ethanol precipitation and direct PCR.
• SPRI magnetic bead recovery resulted in the loss of DNA fragments <150 bp.
• Direct PCR recovery led to significant loss of fragments >300 bp for CTCF and HMGA1 targets.
• srCUT&Tag provided more accurate and higher-resolution data compared to other methods.

Conclusions:

• The srCUT&Tag method enhances CUT&Tag library construction efficiency and data quality.
• srCUT&Tag offers a superior alternative to existing recovery methods for epigenetics research.
• This optimized recovery technique provides a valuable tool for precise protein-DNA interaction studies.