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ChIP-seq, CUT&RUN, and CUT&Tag are all methods to study protein–DNA interactions and histone modifications, but they differ mainly in input requirements, resolution, background noise, and workflow efficiency. In short: ChIP-seq is the traditional gold standard but requires large samples and has high background; CUT&RUN improves precision with lower input and less noise; CUT&Tag is the most advanced, working with ultra-low input and providing the highest resolution at lower cost.
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ChIP-seq (Chromatin Immunoprecipitation Sequencing)
Cells are crosslinked to preserve protein–DNA interactions.
Chromatin is fragmented (usually by sonication).
Antibodies pull down the protein of interest along with bound DNA.
The DNA fragments are purified and sequenced to identify binding sites.
CUT&RUN (Cleavage Under Targets & Release Using Nuclease)
Uses permeabilized cells without crosslinking.
Antibody binds to the target protein in situ.
A fusion of Protein A and MNase (micrococcal nuclease) cleaves DNA near the binding site.
Released fragments diffuse out and are sequenced.
CUT&Tag (Cleavage Under Targets & Tagmentation)
Similar to CUT&RUN but uses a fusion of Protein A and Tn5 transposase.
Antibody binds to the target protein, and Tn5 inserts sequencing adapters directly at binding sites.
DNA is ready for sequencing with minimal processing.
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