CUT&Tag Using "Stress-Free" Con A-Conjugated Dynabeads^®

Area of Science:

• Molecular Biology
• Genomics
• Epigenetics

Background:

• Identifying genomic locations of proteins like transcription factors and histone modifications is crucial in epigenome research.
• Established methods exist, but improvements in sensitivity and reproducibility are continually sought.

Purpose of the Study:

• To describe an updated CUT&Tag (Cleavage Under Targets and Tagmentation) protocol.
• To enhance the sensitivity and reliability of CUT&Tag by optimizing magnetic bead preparation.

Main Methods:

• Cells were bound to concanavalin A (con A)-coated magnetic beads.
• A Protein-A Tn5 transposase fusion protein was used to cut the genome and insert adapter sequences near target proteins.
• "Home-made" con A-conjugated magnetic beads were utilized in the updated procedure.

Main Results:

• The updated method using "home-made" con A-conjugated magnetic beads demonstrated improved performance.
• The procedure effectively minimized issues of poor bead suspendability and severe cell aggregation.
• This resulted in enhanced sensitivity for detecting protein-DNA interactions.

Conclusions:

• The refined CUT&Tag protocol offers a more sensitive and robust approach for epigenome profiling.
• The use of optimized "home-made" magnetic beads provides a practical improvement for researchers in the field.
• This advancement facilitates more accurate mapping of protein binding sites in the genome.