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Updated: Sep 8, 2025

TChIP-Seq: Cell-Type-Specific Epigenome Profiling
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SpyChIP identifies cell type-specific transcription factor occupancy from complex tissues.

Siqian Feng1,2, Richard S Mann1,2,3

  • 1Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10027.

Proceedings of the National Academy of Sciences of the United States of America
|June 13, 2022
PubMed
Summary
This summary is machine-generated.

SpyChIP enables cell type-specific transcription factor (TF) binding site identification in complex tissues without dissociation. This method uses SpyTag-SpyCatcher technology for precise in vivo analysis, overcoming limitations of traditional ChIP.

Keywords:
ChIPDrosophilaSpyTagUbxtranscription factor

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Area of Science:

  • Molecular Biology
  • Genomics
  • Developmental Biology

Background:

  • Chromatin immunoprecipitation (ChIP) is crucial for studying protein-DNA interactions in vivo.
  • Traditional ChIP lacks cell type specificity in complex tissues, limiting analysis.
  • Identifying cell-specific transcription factor binding is essential for understanding gene regulation.

Purpose of the Study:

  • To develop a method for cell type-specific ChIP without tissue dissociation or nuclei sorting.
  • To enable the identification of transcription factor binding sites in specific cell populations within complex tissues.
  • To overcome the limitations of whole-tissue ChIP approaches.

Main Methods:

  • Developed SpyChIP, utilizing SpyTag-SpyCatcher covalent isopeptide bond technology.
  • Genome-engineered target transcription factors (TFs) with SpyTag.
  • Expressed epitope-tagged SpyCatcher in specific cell populations for covalent binding.
  • Performed ChIP using antibodies against the epitope tag on whole tissue extracts.

Main Results:

  • Successfully identified cell type-specific genome-wide binding profiles of Ultrabithorax (Ubx) in Drosophila haltere imaginal disc.
  • Revealed extensive region-specific Ubx-DNA binding events.
  • Provided insights into chromatin accessibility, Ubx-DNA binding relationships, and regulatory mechanisms.

Conclusions:

  • SpyChIP is an effective method for cell type-specific ChIP in native physiological contexts.
  • SpyTag-SpyCatcher technology offers broad potential for in vivo biological applications.
  • Cell type-specific ChIP is significant for understanding complex gene regulatory networks.