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Radiation-induced DNA damage and delayed induced genomic instability
Keiji Suzuki1, Mitsuaki Ojima, Seiji Kodama
1Department of Radiology and Radiation Biology, Course of Life Sciences and Radiation Research, Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan. kzsuzuki@net.nagasaki-u.ac.jp
Oncogene
|October 15, 2003
Summary
Ionizing radiation causes lasting genomic instability in cells, leading to delayed mutations and cancer. This instability is transmitted across generations, with DNA damage memory playing a key role.
Area of Science:
- Radiation biology
- Genetics
- Molecular biology
Background:
- Ionizing radiation exposure can induce genomic instability.
- Genomic instability is transmitted across cell generations.
- This instability is linked to delayed effects like mutations and cancer.
Purpose of the Study:
- To review current data on radiation-induced genomic instability.
- To discuss mechanisms of initiation and perpetuation.
- To explore the role of p53 protein activation.
Main Methods:
- Literature review of radiation biology and genetics studies.
- Analysis of mechanisms underlying delayed DNA damage and mutations.
- Discussion of cellular memory in genomic instability.
Main Results:
- Radiation-induced genomic instability manifests as delayed reproductive death, chromosomal instability, and mutagenesis.
- Genomic instability accumulates gene mutations and chromosomal rearrangements, contributing to carcinogenesis.
- Delayed DNA breakage, driven by a memory of initial damage, induces delayed phenotypes.
Conclusions:
- Radiation-induced genomic instability is a long-term consequence of exposure.
- Mechanisms of initiation, perpetuation, and p53 activation are crucial.
- Understanding these processes is vital for assessing radiation risks.