We measured the yield and spectrum of strand breaks and nucleobase lesions produced in fully hydrated plasmid DNA films to determine the linear energy transfer (LET) dependence of DNA damage induced by ion-beam irradiation in relation to the change in the atomic number of ions. The yield of isolated damage was revealed as a decrease in prompt SSBs with increasing LET of He2+, C5+,6+ and Ne8+,10+ ions. On the other hand, the yields of prompt DSBs increased with increasing ion LET. SSBs were additionally induced in ion-irradiated DNA film by treatment with two kinds of base excision repair proteins (glycosylases), Nth and Fpg, indicating that base lesions are produced in the hydrated DNA film. This result shows that nucleobase lesions are produced via both chemical reactions with diffusible water radicals, such as OH radicals, and direct energy deposition onto DNA and the hydrated water layer. Nth-sensitive sites deduced to be pyrimidine lesions, such as 5,6-dihydrothymine (DHT), showed a relatively larger yield than Fpg-sensitive sites deduced to be purine lesions, such as 7,8-dihydro-8-oxo-2′deoxyguanine (8-oxoGua), for all ion exposures tested. The yield of SSBs or DSBs observed by enzyme treatment decreased noticeably with increasing LET for all tested ions. These results indicated that higher-LET ions preferentially produce a complex type of damage that might compromise the activities of the glycosylases used in this study. These findings are biologically important since, under cell mimicking conditions, persistent DNA damage occurs in part due to direct energy deposition on the DNA or hydrated water shell that is specifically induced by dense ionization in the track.
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1 May 2012
REGULAR ARTICLES|
December 29 2011
Yield of Single- and Double-Strand Breaks and Nucleobase Lesions in Fully Hydrated Plasmid DNA Films Irradiated with High-LET Charged Particles
Takeshi Ushigome;
Takeshi Ushigome
aAdvanced Science Research Center, Japan Atomic Energy Agency, 2-4 Shirakata-shirane, Tokai, Ibaraki 319-1195, Japan
bDepartment of Environmental Sciences, Faculty of Science, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan
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Naoya Shikazono;
Naoya Shikazono
aAdvanced Science Research Center, Japan Atomic Energy Agency, 2-4 Shirakata-shirane, Tokai, Ibaraki 319-1195, Japan
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Kentaro Fujii;
Kentaro Fujii
aAdvanced Science Research Center, Japan Atomic Energy Agency, 2-4 Shirakata-shirane, Tokai, Ibaraki 319-1195, Japan
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Ritsuko Watanabe;
Ritsuko Watanabe
cRadiation Effect Analysis Group, Japan Atomic Energy Agency, 2-4 Shirakata-shirane, Tokai, Ibaraki 319-1195, Japan
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Masao Suzuki;
Masao Suzuki
dHeavy-ion Radiobiology Research Group, National Institute of Radiological Sciences, 4-9-1 Anagawa, Chiba 263-8555, Japan
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Chizuru Tsuruoka;
Chizuru Tsuruoka
dHeavy-ion Radiobiology Research Group, National Institute of Radiological Sciences, 4-9-1 Anagawa, Chiba 263-8555, Japan
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Hiroshi Tauchi;
Hiroshi Tauchi
bDepartment of Environmental Sciences, Faculty of Science, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan
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Akinari Yokoya
Akinari Yokoya
1
aAdvanced Science Research Center, Japan Atomic Energy Agency, 2-4 Shirakata-shirane, Tokai, Ibaraki 319-1195, Japan
1Address for correspondence: Advanced Science Research Center, Japan Atomic Energy Agency, 2-4 Shirakata-shirane, Tokai, Ibaraki 319-1195, Japan; e-mail: yokoya.akinari@jaea.go.jp.
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Radiat Res (2012) 177 (5): 614–627.
Article history
Received:
June 13 2011
Accepted:
November 29 2011
Citation
Takeshi Ushigome, Naoya Shikazono, Kentaro Fujii, Ritsuko Watanabe, Masao Suzuki, Chizuru Tsuruoka, Hiroshi Tauchi, Akinari Yokoya; Yield of Single- and Double-Strand Breaks and Nucleobase Lesions in Fully Hydrated Plasmid DNA Films Irradiated with High-LET Charged Particles. Radiat Res 1 May 2012; 177 (5): 614–627. doi: https://doi.org/10.1667/RR2701.1
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