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Related Concept Videos

Overview of DNA Repair02:25

Overview of DNA Repair

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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.
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Base Excision Repair01:54

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One of the common DNA damages is the chemical alteration of single bases by alkylation, oxidation, or deamination. The altered bases cause mispairing and strand breakage during replication. This type of damage causes minimal change to the DNA double helix structure and can be repaired by the base excision repair (BER) pathways. BER corrects damaged DNA sequences by removing the damaged base and restoring the original base sequence using the complementary strand as a template.
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Related Experiment Video

Updated: Jan 24, 2026

Visualization of DNA Repair Proteins Interaction by Immunofluorescence
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Visualization of DNA Repair Proteins Interaction by Immunofluorescence

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Repair-Resistant DNA Lesions.

Nicholas E Geacintov1, Suse Broyde1

  • 1Chemistry and Biology Departments, New York University , New York, New York 10003-5180, United States.

Chemical Research in Toxicology
|July 28, 2017
PubMed
Summary

Global genomic nucleotide excision repair (GG-NER) removes DNA damage. Structural features of DNA lesions dictate GG-NER resistance, impacting mutation risk and drug efficacy.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • The global genomic nucleotide excision repair (GG-NER) pathway is crucial for removing bulky DNA lesions.
  • Some DNA lesions are repaired slowly or resist repair, posing biological challenges.
  • DNA repair proteins recognize structural distortions, not damaged nucleotides directly.

Purpose of the Study:

  • To compare structural features of NER-resistant DNA lesions with good NER substrates.
  • To understand how DNA lesion structure influences repair efficiency.
  • To inform biomarker development and therapeutic strategies.

Main Methods:

  • Comparative analysis of DNA lesion structures.
  • Review of existing literature on GG-NER substrates and resistance mechanisms.

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Atomic Force Microscopy Investigations of DNA Lesion Recognition in Nucleotide Excision Repair
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Quantitative, Real-time Analysis of Base Excision Repair Activity in Cell Lysates Utilizing Lesion-specific Molecular Beacons
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Quantitative, Real-time Analysis of Base Excision Repair Activity in Cell Lysates Utilizing Lesion-specific Molecular Beacons

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Atomic Force Microscopy Investigations of DNA Lesion Recognition in Nucleotide Excision Repair
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Quantitative, Real-time Analysis of Base Excision Repair Activity in Cell Lysates Utilizing Lesion-specific Molecular Beacons
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Main Results:

  • Specific structural characteristics correlate with NER resistance or efficient repair.
  • NER-resistant lesions can persist, leading to mutations and potential cancer initiation.
  • Understanding lesion structure can guide the design of repair-resistant chemotherapeutics.

Conclusions:

  • DNA lesion structure is a key determinant of GG-NER pathway efficacy.
  • Insights into NER resistance can improve understanding of genotoxic chemical exposure and cancer risk.
  • Knowledge of structural properties can advance the development of novel anti-cancer drugs.