Uv-induced Dna Damage
Uv-induced Dna Damage - Related Videos
04:09
Assessing DNA Damage Foci: To Identify Radiation-Induced DNA Damage Foci in Cancer Cell Line Using Immunofluorescence Staining
0 Views •
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
0 Views •
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.
06:19
Comet Assay for DNA Damage Detection in Cells
0 Views •
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.
10:00
Assaying DNA Damage in Hippocampal Neurons Using the Comet Assay
0 Views •
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.
10:36
Visualization of UV-induced Replication Intermediates in E. coli using Two-dimensional Agarose-gel Analysis
0 Views •
Cited by 2 •
2010
We present a procedure by which two-dimensional agarose-gel analysis can be used to identify the structure of replication intermediates that occur following UV irradiation.
FAQs
Damage begins when ultraviolet radiation creates covalent links between adjacent pyrimidine bases, changing local DNA geometry rather than merely altering an individual base. The principal lesions described here are cyclobutane pyrimidine dimers and 6-4 photoproducts. Their structural distortion can obstruct normal replication and transcription, making the injury biologically consequential.
UVB can promote these lesions directly, whereas UVA is described as contributing indirectly. This distinction matters when interpreting exposure models and cellular responses, because the two ultraviolet ranges do not contribute to DNA injury in the same way. Both are therefore relevant to investigations of sunlight-associated damage, but their mechanistic roles should not be treated as identical.
Cells do not respond to persistent lesions with a single outcome. Damage recognition can initiate nucleotide excision repair, while cell-cycle checkpoints may restrain progression through the cycle. If lesions remain unresolved, apoptosis can remove affected cells. Studying this sequence helps connect lesion persistence with cellular stress and with the possibility of genome instability.
They represent two lesion classes produced when neighboring pyrimidines become covalently linked. Although both distort the DNA helix and can interfere with replication and transcription, distinguishing them allows studies to ask whether observed cellular responses relate to one lesion type or the other. This separation is useful when evaluating repair behavior or protective interventions.
Research on UV-induced DNA damage can be organized around three linked questions: which lesions form, how cells respond to them, and whether the damage persists. Investigators also use these systems to evaluate protective compounds and sunscreens. The resulting observations connect molecular injury with cellular stress and potential genome instability.
In biology, the topic links environmental exposure to several levels of study. At the organismal level, it helps explain sunlight-related skin disease and cancer research. At the cellular level, it highlights stress responses and repair. At the genomic level, repair failure provides a route to genome instability, making the process relevant to mutation studies.