Dna Lesions
Dna Lesions - Related Videos
10:59
Atomic Force Microscopy Investigations of DNA Lesion Recognition in Nucleotide Excision Repair
0 Views •
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.
12:43
Advanced Confocal Microscopy Techniques to Study Protein-protein Interactions and Kinetics at DNA Lesions
0 Views •
Cited by 8 •
2017
Laser microirradiation is a useful tool for studies of DNA repair in living cells. A methodological approach for the use of UVA lasers to induce various DNA lesions is shown. We have optimized a method for local microirradiation that maintains the normal cell cycle; thus, irradiated cells proceed through mitosis.
08:16
Comparative Lesions Analysis Through a Targeted Sequencing Approach
0 Views •
2019
This article describes a method to identify clonal and subclonal alterations among different specimens from a given patient. Although the experiments described here focus on a specific tumor type, the approach is broadly applicable to other solid tumors.
02:10
Translesion DNA Polymerases
0 Views •
2020
Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication. TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
12:29
Investigation of Protein Recruitment to DNA Lesions Using 405 Nm Laser Micro-irradiation
0 Views •
Cited by 16 •
2018
Studying DNA damage repair kinetics requires a system to induce lesions at defined sub-nuclear regions. We describe a method to create localized double-stranded breaks using a laser-scanning confocal microscope equipped with a 405 nm laser and provide automated procedures to quantify the dynamics of repair factors at these lesions.
FAQs
These damaging agents act through different chemical routes. Reactive oxygen species oxidize DNA components, electrophiles modify nucleobases, ultraviolet radiation alters DNA through photochemical reactions, and hydrolytic processes can cleave phosphodiester bonds. The initiating chemistry therefore influences whether damage primarily changes a base, disrupts pairing, or compromises the DNA backbone.
A modified nucleobase can change its pairing behavior, whereas a cleaved phosphodiester bond directly interrupts backbone continuity. These structural differences alter how DNA-processing enzymes interact with the template. Some lesions misdirect polymerases toward incorrect incorporation, while others prevent normal DNA synthesis, making lesion chemistry important for predicting cellular consequences.
The outcome depends on how a lesion affects polymerase movement and base selection. If a damaged site still permits copying but favors an incorrect partner, replication can produce a mutation. If the altered structure prevents polymerase progression, DNA synthesis stalls instead. Thus, lesion-induced errors and replication blockage represent distinct consequences of chemical damage.
Cells do not respond to all DNA damage identically. Lesion-specific recognition identifies particular structural or chemical abnormalities and directs them toward appropriate repair pathways. This selectivity connects molecular features, such as altered bases or backbone disruption, with downstream processing. Efficient recognition can limit persistence of damage and reduce the opportunity for replication-associated mutations.
Chemical characterization examines how a lesion forms, what structure it possesses, how reactive it remains, and how it interacts with repair processes. Considering these properties together links an initiating reaction to biological behavior. This approach helps distinguish lesions that mainly alter base pairing from those that interfere with backbone integrity or DNA synthesis.
DNA lesions are central to studies of mutagenesis, genome stability, drug responses, and disease mechanisms. Researchers can use lesion chemistry to connect reactive cellular or experimental conditions with altered DNA behavior, repair activity, and replication outcomes. Comparing formation, structure, and reactivity also helps explain why particular damage types produce different biological responses.