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Two major factors involved in the reverse dose-rate effect for somatic mutation induction are the cell cycle position and LET value
https://repo.qst.go.jp/records/45646
https://repo.qst.go.jp/records/4564655e68141-7c56-4674-b36e-9e4d9aa96f0e
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2009-09-28 | |||||
| タイトル | ||||||
| タイトル | Two major factors involved in the reverse dose-rate effect for somatic mutation induction are the cell cycle position and LET value | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Tauchi, Hiroshi
× Tauchi, Hiroshi× Iwata, Yoshiyuki× Komatsu, Kenshi× Furusawa, Yoshiya× Eguchi-Kasai, Kiyomi× Tachibana, Akira× et.al× 田内 広× 岩田 佳之× 古澤 佳也× 笠井 清美 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | To study mechanisms which could be involved in the reverse dose rate effect observed during mutation induction after exposure to high LET radiation, synchronized mouse L5178Y cells were exposed to carbon 290 MeV/n beams with different LET values at the G2/M, G1, G1/S or S phases in the cell cycle. The frequency of Hprt-deficient (6-thioguanine-resistant) mutant induction was subsequently determined. The results showed that after exposure to high LET value radiation (50.8 and 76.5 keV/μm), maximum mutation frequencies were seen at the G2/M phase, but after exposure to lower LET radiation (13.3 keV/μm), the highest mutation frequencies were observed at the G1 phase. The higher LET beam always produced higher mutation frequencies in the G2/M phase than in the G1 phase, regardless of radiation dose. These results suggest that cells in the G2/M phase is hyper-sensitive for mutation induction from high LET radiation, but not to mutation induction from low LET radiation. Molecular analysis of mutation spectra showed that large deletions (which could include almost entire exons) of the mouse Hprt gene were most efficiently induced in G2/M cells irradiated with high LET radiation. These entire exon deletions were not as frequent in cells exposed to lower LET radiation. This suggests that inappropriate recombination repair might have occurred in response to condensed damage in condensed chromatin in the G2/M phase. In addition, by using a hyper-sensitive mutation detection system (GM06318-10 cells), a reverse dose-rate effect was clearly observed after exposure to carbon beams with higher LET values (66 keV/μm), but not after exposure to beams with lower LET values (13.3 keV/μm). Thus, G2/M sensitivity towards mutation induction, and the dependence on radiation LET values could both be major factors involved in the reverse dose rate effect produced by high LET radiation. | |||||
| 書誌情報 |
Journal of Radiation Research 巻 50, 号 5, p. 441-448, 発行日 2009-06 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 0449-3060 | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1269/jrr.09033 | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | http://www.jstage.jst.go.jp/article/jrr/advpub/0/advpub_0906050094/_article | |||||
| 関連名称 | http://www.jstage.jst.go.jp/article/jrr/advpub/0/advpub_0906050094/_article | |||||
