Radiation-induced changes in DNA methylation and their relationship to chromosome aberrations in nuclear power plant workers
- Authors
- Lee, Younghyun; Kim, Yang Jee; Choi, Young Joo; Lee, Joong Won; Lee, Sunyeong; Cho, Yoon Hee; Chung, Hai Won
- Issue Date
- Feb-2015
- Publisher
- TAYLOR & FRANCIS LTD
- Keywords
- Radiation; DNA methylation; chromosome aberrations; nuclear power plant workers
- Citation
- INTERNATIONAL JOURNAL OF RADIATION BIOLOGY, v.91, no.2, pp 142 - 149
- Pages
- 8
- Journal Title
- INTERNATIONAL JOURNAL OF RADIATION BIOLOGY
- Volume
- 91
- Number
- 2
- Start Page
- 142
- End Page
- 149
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/9926
- DOI
- 10.3109/09553002.2015.969847
- ISSN
- 0955-3002
1362-3095
- Abstract
- Purpose: We investigated the association between occupational radiation exposure and DNA methylation changes in nuclear power plant workers. We also evaluated whether radiation-induced DNA methylation alterations are associated with chromosome aberrations. Materials and methods: The study population included 170 radiation-exposed workers and 30 controls. We measured global, long interspersed nuclear element-1 (LINE-1), and satellite 2 methylation levels in blood leukocyte DNA. The analysis of chromosome aberrations was performed on peripheral lymphocytes. Results: Global DNA methylation levels were lower in radiation-exposed workers than in controls. The methylation levels were negatively associated with the recent 1.5-year radiation dose in a multiple linear regression model (beta = -0.0088, p <= 0.001); the levels increased proportionally with the total cumulative dose in radiation-exposed workers. LINE-1 methylation levels were higher in radiation-exposed workers than in controls and were significantly associated with the total cumulative radiation dose in a multiple linear regression model (beta = -0.031, p = 0.035). Global DNA methylation levels were also correlated with chromosome aberrations among workers. Workers with low global methylation levels had a higher frequency of chromosome aberrations than did subjects with high global methylation levels. Conclusion: Occupational exposure to low-dose radiation could affect DNA methylation levels, and the radiation-induced DNA methylation alterations may be associated with chromosome aberrations.
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