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Updated: Oct 21, 2025
Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage
Published on: August 21, 2021
Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage
Vasiliki Pantazi1, Ivett Berzsenyi1, Barbara N Borsos1
1Institute of Pathology, Faculty of Medicine, University of Szeged.
Abstract:
Cells are continuously exposed to various DNA damaging agents, inducing different cellular responses. Applying biochemical and genetic approaches is essential in revealing cellular events associated with the recruitment and assembly of DNA repair complexes at the site of DNA damage. In the last few years, several powerful tools have been developed to induce site-specific DNA damage. Moreover, novel seminal techniques allow us to study these processes at the single-cell resolution level using both fixed and living cells. Although these techniques have been used to study various biological processes, herein we present the most widely used protocols in the field of DNA repair, Fluorescence Immunostaining (IF) and Chromatin Immunoprecipitation (ChIP), which in combination with endonuclease-based site-specific DNA damage make it possible to visualize and quantify the genomic occupancy of DNA repair factors in a directed and regulated fashion, respectively. These techniques provide powerful tools for the researchers to identify novel proteins bound to the damaged genomic locus as well as their post-translational modifications necessary for their fine-tune regulation during DNA repair.
Insights
Researchers can now visualize and quantify DNA repair factors at damaged DNA sites using advanced techniques. Fluorescence Immunostaining (IF) and Chromatin Immunoprecipitation (ChIP) offer precise methods for studying DNA repair mechanisms.
Area of Science:
- Molecular Biology
- Genetics
- Cell Biology
Background:
- Cells face constant DNA damage from various agents, triggering complex repair responses.
- Understanding DNA repair mechanisms requires studying the recruitment and assembly of repair complexes at damage sites.
- Recent advancements provide tools for site-specific DNA damage induction and single-cell resolution studies.
Purpose of the Study:
- To present widely used protocols for studying DNA repair.
- To demonstrate how Fluorescence Immunostaining (IF) and Chromatin Immunoprecipitation (ChIP) can be combined with site-specific DNA damage.
- To enable visualization and quantification of DNA repair factor occupancy at damaged DNA loci.
Main Methods:
- Utilizing endonuclease-based site-specific DNA damage induction.
- Applying Fluorescence Immunostaining (IF) for visualizing DNA repair factor recruitment.
- Employing Chromatin Immunoprecipitation (ChIP) for quantifying DNA repair factor binding.
Main Results:
- IF allows direct visualization of DNA repair complexes at induced damage sites.
- ChIP enables quantitative assessment of genomic occupancy by DNA repair factors.
- These methods facilitate the identification of novel proteins and their modifications involved in DNA repair.
Conclusions:
- Combined IF and ChIP with site-specific DNA damage are powerful tools for DNA repair research.
- These techniques allow directed and regulated study of DNA repair factor dynamics.
- Researchers can identify new DNA repair proteins and regulatory post-translational modifications.
