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Related Experiment Video

Updated: Aug 19, 2025

Strand-Specific Analysis of Proteins at Replicating DNA Strands by Enrichment and Sequencing of Protein-Associated Nascent DNA Method
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spKAS-seq reveals R-loop dynamics using low-input materials by detecting single-stranded DNA with strand specificity.

Tong Wu1,2, Ruitu Lyu1,2, Chuan He1,2,3

  • 1Department of Chemistry, University of Chicago, Chicago, IL, USA.

Science Advances
|November 30, 2022
PubMed
Summary
This summary is machine-generated.

New spKAS-seq technology maps R-loops using minimal cells. This method reveals R-loops in DNA, affecting gene transcription and stability, and identifies them as RNA binding protein hotspots.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Epigenetics

Background:

  • R-loops, structures of DNA-RNA hybrids, are crucial for transcription and genome stability.
  • Dysregulation of R-loops is implicated in various human diseases.
  • Current R-loop mapping methods require substantial cell numbers and yield variable results.

Purpose of the Study:

  • To develop a sensitive and efficient method for mapping R-loops genome-wide.
  • To investigate the dynamics and genomic locations of R-loops.
  • To explore the relationship between R-loops and chromatin-bound RNA binding proteins (RBPs).

Main Methods:

  • Developed strand-specific kethoxal-assisted single-stranded DNA sequencing (spKAS-seq).
  • spKAS-seq leverages the single-stranded DNA (ssDNA) region within R-loop triplex structures.
  • Applied spKAS-seq to map R-loops in various genomic regions using as few as 50,000 cells.

Main Results:

  • spKAS-seq successfully detected R-loops and their dynamics across coding sequences, enhancers, and intergenic regions.
  • The method demonstrated high sensitivity, requiring minimal cell input.
  • Joint analysis revealed that R-loops can serve as binding hotspots for RBPs on chromatin.

Conclusions:

  • spKAS-seq offers a robust and cell-efficient approach for genome-wide R-loop mapping.
  • This technique advances our understanding of R-loop roles in gene regulation and genome integrity.
  • R-loops are identified as key players in the interplay between nucleic acids and proteins in chromatin.