Dna Repair Foci
Dna Repair Foci - Related Videos
04:09
Assessing DNA Damage Foci: To Identify Radiation-Induced DNA Damage Foci in Cancer Cell Line Using Immunofluorescence Staining
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2023
This video describes a protocol to detect radiation-induced DNA repair foci in the colon cancer cell lines using immunofluorescence staining. DNA repair proteins get activated at the DNA damage site; therefore, we can detect them using specific antibodies and visualize them under a fluorescence microscope.
02:25
Overview of DNA Repair
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2020
In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage. Chemically...
05:18
Immunofluorescence Imaging of DNA Damage and Repair Foci in Human Colon Cancer Cells
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Cited by 11 •
2020
Radiation-induced DNA damage response activated by neutron mixed-beam used in boron neutron capture therapy (BNCT) has not been fully established. This protocol provides a step-by-step procedure to detect radiation-induced foci (RIF) of repair proteins by immunofluorescence staining in human colon cancer cell lines after irradiation with the neutron-mixed beam.
05:42
Immunofluorescence-Based Visualization of DNA Repair Protein Interactions
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2025
In this video, we describe the immunofluorescence method to visualize the localization of the DNA repair proteins γH2AX and 53BP1 at the sites of double-strand DNA breaks in irradiated cell nuclei.
10:28
Imaging Mismatch Repair and Cellular Responses to DNA Damage in Bacillus subtilis
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Cited by 8 •
2010
A detailed protocol is described for imaging the real time formation of DNA repair complexes in Bacillus subtilis cells.
FAQs
After a lesion alters DNA structure, damage sensors recognize the change and recruit repair factors. Signaling events, including phosphorylation and histone modification, then help concentrate those factors with modified chromatin in a nuclear region. This organization brings relevant components together, allowing researchers to visualize where the damage response is assembled and coordinated.
These modifications help organize the local response rather than merely marking damaged DNA. Phosphorylation participates in signaling, while histone modification contributes to the altered chromatin environment associated with the focus. Together, they help concentrate repair-related components at the relevant nuclear site, making the response visible and providing a way to study its organization.
Tracking when foci appear and how long they remain can show how a cell responds to DNA damage over time. Their persistence provides information about the continuing damage response and repair pathway activity. This temporal measurement is useful because a single observation may not capture the changing organization of repair factors after damage occurs.
Researchers commonly examine the number, size, and persistence of foci. These features provide cellular readouts of the damage response and can help assess repair pathway activity. Considering all three measurements gives a broader picture than counting foci alone, because the response may differ in how many clusters form, how large they become, and how long they remain.
Researchers can compare focus patterns under conditions involving radiation, chemical agents, or replication stress. Changes in focus number, size, and persistence help reveal how cells organize their response to each type of damage-related challenge. This approach supports comparative studies of cellular damage responses without relying only on the original damaging condition as the experimental readout.
They provide visible cellular markers for examining genome stability and damage responses in individual cells. By analyzing their formation and persistence, investigators can study repair pathway activity in response to diverse stresses and disease-associated DNA damage. This makes foci analysis relevant both for basic biology and for biomedical research focused on abnormal or persistent genome damage.