Dna Damage Recognition
Dna Damage Recognition - Related Videos
10:59
Atomic Force Microscopy Investigations of DNA Lesion Recognition in Nucleotide Excision Repair
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Cited by 2 •
2017
Here, the study of different DNA lesion recognition approaches via single molecule AFM imaging is demonstrated with the nucleotide excision repair system as an example. The procedures of DNA and protein sample preparations and experimental as well as analytical details for the AFM experiments are described.
06:19
Comet Assay for DNA Damage Detection in Cells
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2025
The video demonstrates the comet assay for detecting DNA damage following exposure to harmful agents. Under alkaline conditions, the DNA unwinds and denatures, and upon electrophoresis, the undamaged and damaged DNA migrate differently in the agarose gel, forming a comet-shaped structure. The slowly migrating undamaged DNA forms the circular comet head, while the rapidly migrating damaged DNA fragments form the elongated comet tail.
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.
10:55
Study of the DNA Damage Checkpoint using Xenopus Egg Extracts
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Cited by 35 •
2012
Xenopus egg extract is a useful model system to investigate the DNA damage checkpoint. This protocol is for the preparation of Xenopus egg extracts and DNA damage checkpoint inducing reagents. These techniques are adaptable to a variety of DNA damaging approaches in the study of the DNA damage checkpoint signaling.
10:00
Assaying DNA Damage in Hippocampal Neurons Using the Comet Assay
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Cited by 21 •
2012
The comet assay is an efficient way of detecting single- and double-strand breaks, including alkali-labile sites and DNA-DNA/DNA-protein cross-links on the DNA in all cells including hippocampal neurons. The method takes advantage of the differential migration of DNA in an electric field due to differences in amount of DNA damage.
FAQs
Detection is tailored to the abnormality presented by the DNA. Sensor proteins can respond to altered bases, distortions in the DNA helix, stalled replication structures, or DNA breaks. This classification is important because the lesion’s chemical or structural features, together with its location, help direct signaling toward the repair machinery most suited to the problem.
These pathways are associated with different damage contexts. Base excision repair, nucleotide excision repair, and double-strand break repair are selected according to the lesion’s type and position in the genome. Recognition therefore acts as a routing step, ensuring that signaling and recruitment are matched to the abnormal structure rather than activating one universal repair response.
Recognition does more than identify a lesion: it initiates signaling that coordinates the cell’s next response. This signaling can recruit appropriate repair machinery and activate checkpoints, which help regulate cell-cycle progression while the problem is addressed. The result is a coordinated connection between damage detection, repair activity, and broader genome-stability control.
When damage is irreparable, the cellular response can extend beyond repair and checkpoint activation to include cell death. This provides an alternative to allowing persistent abnormalities to remain in the genome. Studying this outcome helps explain how cells balance survival with genome protection when repair mechanisms cannot restore an acceptable DNA structure.
Investigating recognition mechanisms shows how abnormal DNA structures are connected to repair decisions and the preservation of genome stability. If these processes are altered or unsuccessful, the relationship between damage and mutation becomes a central research question. This makes the topic useful for understanding how cells manage genomic abnormalities before they contribute to broader biological consequences.
The process provides a framework for examining how cells respond to DNA abnormalities in different biological settings. In cancer research, it helps relate damage responses to mutation and genome instability; in aging studies, it supports investigation of damage management over time. It is also relevant to genotoxic therapies because such treatments are studied through cellular responses to DNA damage.