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Related Experiment Video

Updated: May 10, 2025

Retroviral Overexpression of CXCR4 on Murine B-1a Cells and Adoptive Transfer for Targeted B-1a Cell Migration to the Bone Marrow and IgM Production
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Optimized CUT&RUN protocol for activated primary mouse B cells.

Stormy E Ruiz1,2, Robert W Maul1, Patricia J Gearhart1

  • 1Laboratory of Molecular Biology and Immunology, National Institute on Aging, National Institutes of Health, Baltimore, Maryland, United States of America.

Plos One
|April 24, 2025
PubMed
Summary
This summary is machine-generated.

A modified CUT&RUN technique enables high-quality chromatin-protein interaction studies in B lymphocytes, overcoming limitations of previous methods for fragile cell types.

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Immunology

Background:

  • Chromatin immunoprecipitation sequencing (ChIP-seq) is the standard for studying chromatin-protein interactions.
  • Cleavage under target and release using nuclease (CUT&RUN) offers advantages over ChIP-seq, including higher signal quality and reduced sample requirements.
  • The original CUT&RUN protocol is not suitable for fragile primary B lymphocytes.

Purpose of the Study:

  • To adapt the CUT&RUN protocol for analyzing chromatin-protein interactions in primary B lymphocytes.
  • To enable high-quality data acquisition from limited numbers of B cells.
  • To quantify non-histone proteins bound to DNA in B cells efficiently.

Main Methods:

  • Cells were fixed prior to nuclear isolation.
  • Critical adjustments were made to the CUT&RUN procedure and reagents for B cell compatibility.
  • Binding of H3K4me3 histone and RNA Polymerase II was measured.

Main Results:

  • The modified CUT&RUN protocol detected robust peaks with as few as 100,000 nuclei.
  • Freeze-thaw processing of B cells did not impact the results, indicating protocol flexibility.
  • High-quality data was obtained from activated primary B lymphocytes.

Conclusions:

  • The adapted CUT&RUN protocol is effective for studying chromatin-protein interactions in B lymphocytes.
  • This method provides a more efficient alternative to ChIP-seq for analyzing limited B cell samples.
  • The protocol allows for quantification of non-histone proteins bound to DNA in B cells.