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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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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
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Updated: Jul 11, 2025

Laser Microirradiation to Study In Vivo Cellular Responses to Simple and Complex DNA Damage
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Types of DNA damage and research progress.

Liu Nian1,2, Li Xiaohua3, Li Rongcheng1,2

  • 1School of Chemistry and Life Sciences, Suzhou University of Science and Technology, Suzhou, China.

Nucleosides, Nucleotides & Nucleic Acids
|November 10, 2023
PubMed
Summary

DNA damage, structural DNA modifications from internal or external factors, can lead to diseases like cancer and aging. Understanding DNA damage types and reactions is crucial for disease research.

Keywords:
DNA base damageDNA mutationDNA nucleotide damageDNA strand damage

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • DNA damage is a structural alteration in DNA.
  • It arises from endogenous and exogenous factors.
  • DNA damage is linked to diseases, genetic mutations, cancer, and aging.

Purpose of the Study:

  • To provide a comprehensive review of DNA damage.
  • To detail recent advances in DNA damage types and reaction processes.
  • To explore the biological implications of DNA damage.

Main Methods:

  • Literature review of recent advances in DNA damage research.
  • Categorization of DNA damage types (bases, nucleotides, strands).
  • Analysis of associated reaction processes and biological implications.

Main Results:

  • Detailed overview of various DNA damage types.
  • Explanation of the reaction processes underlying DNA damage.
  • Discussion of the link between DNA damage and diseases.

Conclusions:

  • A deeper understanding of DNA damage types and reactions is essential.
  • This knowledge is vital for studying cancer and other genetic diseases.
  • The review highlights the significance of DNA damage in biological systems.