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Intracellular Strand Break End Extension-Encoded Amplification for In Situ Visualization of Diverse DNA Damages.

Yan He1, Yuheng Zhu1, Xuelin Zhao1

  • 1Institute of Analytical Chemistry and Instrument for Life Science, The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, P. R. China.

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|February 7, 2026
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This study introduces Intracellular Strand Break End Extension-Encoded Amplification (ISBEA), a new method for visualizing multiple DNA damages simultaneously within cells. ISBEA enables a deeper understanding of DNA repair mechanisms and genome stability.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • DNA damage detection is crucial for understanding DNA repair and genome stability.
  • Current methods for detecting DNA damage are limited to specific lesion types and lack spatial context.
  • Visualizing diverse DNA damages in situ is essential for accurate mechanistic studies.

Purpose of the Study:

  • To develop a novel in situ imaging strategy for simultaneous visualization of multiple DNA lesion types.
  • To overcome the limitations of existing methods in capturing the spatial distribution of DNA damage.
  • To provide a robust platform for investigating DNA damage origins, repair, and consequences.

Main Methods:

  • Intracellular Strand Break End Extension-Encoded Amplification (ISBEA) utilizes a sequential enzymatic workflow.
  • Glycosylases, endonucleases, and exonucleases selectively recognize and process various DNA lesions.
  • Lesions are converted to uniform 3'-hydroxyl termini, enabling DNA-encoded amplification and fluorescence signal generation for each damage type.

Main Results:

  • ISBEA enables simultaneous, spatially resolved visualization of diverse DNA damages within intact cells.
  • The method allows for the detection of multiple DNA lesion types, including oxidized purines, AP sites, and strand breaks.
  • Successful generation of fluorescence signals correlated with specific damage types, demonstrating the efficacy of the amplification strategy.

Conclusions:

  • ISBEA is a powerful new tool for studying DNA damage and repair in a cellular context.
  • This method advances the understanding of genome stability maintenance by providing spatially resolved data on multiple DNA lesion types.
  • ISBEA offers valuable methodological support for research into DNA damage-related diseases and therapeutic development.