NanoTag is an improved method to map interactions between DNA and proteins not requiring IgG

Area of Science:

• Molecular Biology
• Genomics
• Epigenetics

Background:

• Genome-wide profiling of DNA-protein interactions is crucial for understanding gene regulation.
• Current methods like ChIP-seq and CUT&Tag rely on conventional IgG antibodies, limiting their scope to targets with available antibodies.

Purpose of the Study:

• To introduce NanoTag, an innovative IgG-free method for profiling DNA-protein interactions.
• To demonstrate NanoTag's ability to map GFP-tagged proteins associated with chromatin.
• To provide a fast, cost-effective, and animal-free alternative for DNA-binding profiling.

Main Methods:

• NanoTag is derived from CUT&Tag, utilizing a fusion protein of an anti-GFP nanobody and Tn5 transposase.
• The method was applied to indirectly profile the histone mark H3K4me3 via TAF3 and transcription factors Nanog and CTCF in mouse embryonic stem cells (mESCs).
• Genome-wide DNA-binding profiles were generated.

Main Results:

• NanoTag demonstrated high inter-replicate reproducibility and a high signal-to-noise ratio.
• The results showed a strong correlation with existing CUT&Tag datasets, confirming accuracy and reliability.
• Successful genome-wide profiling of H3K4me3, Nanog, and CTCF was achieved.

Conclusions:

• NanoTag offers a novel, flexible, and cost-effective IgG-free approach for DNA-protein interaction profiling.
• The method enables high-resolution DNA-binding profiles in various cell and tissue types.
• NanoTag expands the toolkit for studying gene regulation mechanisms without antibody limitations.