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Related Experiment Video

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Optimized ChIP-exo for mammalian cells and patterned sequencing flow cells.

Daniela Q James1, Sohini Mukherjee1, C Caiden Cannon1

  • 1Center for Eukaryotic Gene Regulation, Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802, United States.

G3 (Bethesda, Md.)
|November 9, 2025
PubMed
Summary

We optimized the ChIP-exo protocol for mammalian cells, creating a streamlined method for high-resolution genome-wide protein-DNA interaction analysis. This new protocol (MO-ChIP-exo) overcomes previous technical barriers, enhancing accessibility for researchers.

Keywords:
CTCFChIP-exoNGSNextSeq 2000chromatinchromatin immunoprecipitationprotocolssonication

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Area of Science:

  • Molecular Biology
  • Genomics
  • Epigenetics

Background:

  • Chromatin immunoprecipitation with exonuclease (ChIP-exo) offers high-resolution genome-wide protein-DNA interaction mapping.
  • Widespread ChIP-exo adoption is limited by lengthy protocols, custom reactions, and sequencing platform incompatibilities.

Purpose of the Study:

  • To optimize and adapt the ChIP-exo library construction protocol for mammalian cells and modern sequencing technologies.
  • To develop a more robust and efficient method for generating high-quality ChIP-exo libraries from mammalian samples.

Main Methods:

  • Systematic optimization of crosslinking, cell harvesting, and library construction steps for ChIP-exo.
  • Adaptation of the protocol for both suspension (K562) and adherent (HepG2, mESC) mammalian cell lines.
  • Validation by comparison with existing ChIP-exo protocols.

Main Results:

  • Introduction of a mammalian-optimized ChIP-exo (MO-ChIP-exo) protocol.
  • Demonstrated adaptability of MO-ChIP-exo across different mammalian cell types.
  • Successful generation of high-quality ChIP-exo libraries using the optimized protocol.

Conclusions:

  • The MO-ChIP-exo protocol effectively addresses technical challenges associated with previous ChIP-exo methods.
  • This optimized protocol enhances the efficiency and robustness of mapping protein-DNA interactions in mammalian systems.
  • MO-ChIP-exo facilitates broader application of high-resolution ChIP-exo analysis in biological research.