Linking oxidative DNA lesion 8-OxoG to tumor development and progression
Yan Zhao1, Chen-Xin Wang2, Tian-Ming Yang2
1Department of Biological Vector Control, Center for Disease Control and Prevention of Jilin Province, Changchun 130062, China.
Yi Chuan = Hereditas
|June 21, 2022
Summary
Reactive oxygen species (ROS) cause DNA damage, including 8-hydroxyguanine (8-oxoG). The OGG1 enzyme repairs 8-oxoG, and its dysfunction links DNA damage to cancer via epigenetic changes.
Area of Science:
- Molecular Biology
- Genetics
- Epigenetics
Background:
- Aerobic metabolism generates reactive oxygen species (ROS), leading to DNA damage.
- 8-hydroxyguanine (8-oxoG) is a major ROS-induced DNA lesion, repaired by OGG1.
- Unrepaired 8-oxoG can cause mutations (G:C to T:A) and is linked to aging and cancer.
Purpose of the Study:
- To review the role of 8-oxoG and OGG1 in tumor development.
- To explore the epigenetic mechanisms linking DNA oxidative damage to gene expression.
- To provide new perspectives and therapeutic targets for cancer treatment.
Main Methods:
- Literature review of studies on 8-oxoG, OGG1, and cancer.
- Analysis of the interplay between DNA repair, epigenetics, and gene regulation.
- Synthesis of current understanding of 8-oxoG as an epigenetic mark.
Main Results:
- 8-oxoG accumulation or OGG1 dysfunction impacts gene function, potentially driving tumorigenesis.
- Recent findings highlight 8-oxoG's preferential location in regulatory genomic regions.
- OGG1 acts as a reader of 8-oxoG, influencing DNA conformation and histone modifications, thereby altering gene expression.
Conclusions:
- Beyond genotoxicity, 8-oxoG contributes to cancer by epigenetically regulating gene expression.
- Aberrant gene expression initiated by oxidative damage is a key factor in tumor progression.
- Understanding these mechanisms offers novel therapeutic strategies for cancer.
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