[Oxidative DNA damage--analysis and clinical significance]
Tomasz Zaremba1, Ryszard Oliński
1Katedra i Zakład Biochemii Klinicznej Collegium Medicum im. L. Rydygiera w Bydgoszczy, Uniwersytet Mikołaja Kopernika w Toruniu, Bydgoszcz.
Postepy Biochemii
|September 29, 2010
Summary
Oxidative DNA damage from reactive oxygen species (ROS) contributes to cancer, heart disease, and aging. This review details DNA repair mechanisms and highlights 8-oxo-2'-deoxyguanosine (8-oxo-dG) detection for assessing oxidative damage.
Area of Science:
- Biochemistry
- Molecular Biology
- Genetics
Background:
- Cellular metabolism naturally produces reactive oxygen species (ROS), leading to inevitable oxidative DNA damage.
- Oxidative stress, from external insults, exacerbates DNA damage, implicated in diseases like cancer and cardiovascular conditions, as well as aging.
- Over 20 oxidative DNA base modifications exist, but 8-oxo-2 -deoxyguanosine (8-oxo-dG) is a key focus.
Purpose of the Study:
- To review the mechanisms linking oxidative DNA damage to pathological processes.
- To describe the crucial role of DNA repair mechanisms in cellular function.
- To present methods for detecting 8-oxo-dG as a biomarker of oxidative DNA damage.
Main Methods:
- Literature review of oxidative stress, DNA damage, and repair pathways.
- Analysis of mechanisms connecting DNA damage to disease pathogenesis.
- Overview of techniques for quantifying 8-oxo-dG levels.
Main Results:
- Oxidative DNA damage is a significant factor in cancer, cardiovascular disease, and aging.
- DNA repair systems are vital for cellular integrity.
- 8-oxo-dG is a sensitive marker for oxidative DNA damage, with various detection methods available.
Conclusions:
- Understanding oxidative DNA damage and repair is crucial for disease prevention and treatment.
- 8-oxo-dG detection offers a valuable tool for assessing oxidative stress and related pathologies.
- Further research into 8-oxo-dG and its role in disease is warranted.
More Related Videos
Related Concept Videos
01:38Nucleotide 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...
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...
02:25Overview 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...
Chemically...
01:25Bioactivation and Tissue Toxicity
Bioactivation is a metabolic process that transforms less reactive substances into highly reactive metabolites, initiating tissue toxicity. This transformation can lead to various toxic effects, including carcinogenesis and teratogenesis. Reactive metabolites are classified into two main types: electrophiles and free radicals.Electrophiles are electron-deficient species and are produced primarily by the enzyme cytochrome P-450 during the metabolism of compounds containing carbon, nitrogen, or...
01:00Cellular Injury I: Introduction
Cellular injury occurs when a cell cannot maintain homeostasis or adapt to stressors such as hypoxia, toxins, or trauma. Depending on severity and duration, injury may be reversible, allowing recovery, or irreversible, leading to cell death.General Mechanisms of Cell InjuryAlthough causes vary, most cellular injuries arise from a few key mechanisms that disrupt essential functions and often amplify one another. Cell survival depends on the extent and balance of these disturbances.ATP depletion...
02:36DNA Damage can Stall the Cell Cycle
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...