Related Experiment Video

Updated: Aug 9, 2026

Immunofluorescence Imaging of DNA Damage and Repair Foci in Human Colon Cancer Cells
05:18

Immunofluorescence Imaging of DNA Damage and Repair Foci in Human Colon Cancer Cells

Published on: June 9, 2020

DNA damage, repair systems and human hypersensitive diseases

J E Cleaver

    Journal of Environmental Pathology and Toxicology
    |March 1, 1980
    PubMed

    Insights

    DNA damage from carcinogens can lead to cancer. Excision repair mechanisms mend this damage, but unrepaired lesions can cause mutations and cancer, particularly in diseases with impaired DNA repair.

    Area of Science:

    • Molecular Biology
    • Genetics
    • Cancer Research

    Background:

    • Carcinogenic agents cause DNA damage, a critical early step in carcinogenesis.
    • Excision repair pathways enzymatically remove DNA lesions, restoring normal DNA structure.
    • Unrepaired DNA damage disrupts DNA replication, potentially leading to mutagenesis and cancer.

    Purpose of the Study:

    • To elucidate the role of DNA damage and repair in carcinogenesis.
    • To investigate the link between impaired excision repair and cancer development.

    Main Methods:

    • Review of molecular mechanisms of DNA damage and repair.
    • Analysis of the consequences of unrepaired DNA damage on DNA replication and mutagenesis.
    • Examination of human diseases with defects in excision repair and elevated cancer risk.

    Main Results:

    • DNA damage is a key initiator of the carcinogenic process.
    • Excision repair is crucial for preventing mutations and cancer.
    • Deficiencies in excision repair are associated with increased cancer susceptibility.

    Conclusions:

    • Interference with DNA replication due to unrepaired DNA damage can result in mutagenesis and carcinogenesis.
    • Alterations in excision repair are implicated in various human diseases with high cancer incidence.

    More Related Videos

    Visualization of DNA Repair Proteins Interaction by Immunofluorescence07:55

    Visualization of DNA Repair Proteins Interaction by Immunofluorescence

    Published on: June 26, 2020

    Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage10:59

    Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage

    Published on: August 21, 2021

    Related Concept Videos

    Nucleotide Excision Repair01:08

    Nucleotide Excision Repair

    Overview
    Overview of DNA Repair02:25

    Overview of DNA Repair

    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...
    Nucleotide Excision Repair01:08

    Nucleotide Excision Repair

    Overview
    Mutations01:35

    Mutations

    Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
    Chromosomal Alterations Are Large-Scale Mutations
    While point mutations are changes in a single nucleotide in...
    Overview of DNA Repair02:25

    Overview of DNA Repair

    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...
    Nucleotide Excision Repair01:38

    Nucleotide Excision Repair

    DNA Distortion and Damage
    Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...