Fragmentation and plasmid strand breaks in pure and gold-doped DNA irradiated by beams of fast hydrogen atoms
| Autor: | Karl T. Butterworth, C J Latimer, E. C. Montenegro, David G. Hirst, Frederick Currell, J. A. Wyer, M B Shah |
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| Rok vydání: | 2009 |
| Předmět: |
Materials science
DNA damage Metal Nanoparticles Nanoparticle Electrons Nanotechnology Buffers Photochemistry Models Biological chemistry.chemical_compound Radiology Nuclear Medicine and imaging Sample preparation Irradiation Fragmentation (cell biology) Radiological and Ultrasound Technology DNA Breaks Dose-Response Relationship Radiation DNA Kinetics chemistry Colloidal gold Agarose gel electrophoresis Gold Protons Hydrogen Plasmids |
| Zdroj: | Physics in Medicine and Biology. 54:4705-4721 |
| ISSN: | 1361-6560 0031-9155 |
| Popis: | The results of an investigation into the damage caused to dry plasmid DNA after irradiation by fast (keV) hydrogen atoms are presented. Agarose gel electrophoresis was used to assess single and double strand break yields as a function of dose in dry DNA samples deposited on a mica substrate. Damage levels were observed to increase with beam energy. Strand break yields demonstrated a considerable dependence on sample structure and the method of sample preparation. Additionally, the effect of high-Z nanoparticles on damage levels was investigated by irradiating DNA samples containing controlled amounts of gold nanoparticles. In contrast to previous (photonic) studies, no enhancement of strand break yields was observed with the particles showing a slight radioprotective effect. A model of DNA damage as a function of dose has been constructed in terms of the probability for the creation of single and double strand breaks, per unit ion flux. This model provides quantitative conclusions about the effects of both gold nanoparticles and the different buffers used in performing the assays and, in addition, infers the proportion of multiply damaged fragments. |
| Databáze: | OpenAIRE |
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