1
|
Khalili F, Vafaee M, Shokri B. Attosecond charge migration following oxygen K-shell ionization in DNA bases and base pairs. Phys Chem Chem Phys 2021; 23:23005-23013. [PMID: 34611693 DOI: 10.1039/d1cp02920g] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Core ionization of DNA begins a cascade of events which could lead to cellular inactivation or death. The created core-hole following an impulse inner-shell ionization of molecules naturally decays in the auger timescale. We simulated charge migration (CM) phenomena following an impulsive core ionization of individual DNA bases at the oxygen K-edge which occurs before Auger decay of the oxygen. Our approach is based on real-time time dependent density functional theory (RT-TDDFT). It is shown that the pronounced hole fluctuation observed around bonds of the initial core-hole results in various valence orbital migrations. Also, the same photo-core-ionized dynamics is studied for the related base pairs. We investigate the role of base pairing and H-bonding interactions in the attosecond CM dynamics. In particular, the creation of a core-hole in the oxygen involved in H-bonding leads to an enhancement of charge migration relative to the respective single bases. Importantly, the hole oscillation of the adenine-thymine base pair upon creation of a core-hole at the oxygen, which does not contribute to the donor-acceptor interactions (not H-bonded), decreases compared to the single thymine base. Understanding the detailed dynamics of the localized core-hole initiating CM process would open the way for chemically controlling DNA damage/repair in the future.
Collapse
Affiliation(s)
- Fatemeh Khalili
- Department of Physics, Shahid Beheshti University, Velenjak, Tehran 19839, Iran.
| | - Mohsen Vafaee
- Department of Chemistry, Tarbiat Modares University, P. O. Box 14115-175, Tehran, Iran.
| | - Babak Shokri
- Department of Physics, Shahid Beheshti University, Velenjak, Tehran 19839, Iran. .,Laser-Plasma Research Institute, Shahid Beheshti University, Velenjak, Tehran 19839, Iran
| |
Collapse
|
2
|
Huart L, Nicolas C, Kaddissy JA, Guigner JM, Touati A, Politis MF, Mercere P, Gervais B, Renault JP, Hervé du Penhoat MA. Soft X-ray Radiation and Monte Carlo Simulations: Good Tools to Describe the Radiation Chemistry of Sub-keV Electrons. J Phys Chem A 2020; 124:1896-1902. [PMID: 32118425 DOI: 10.1021/acs.jpca.9b10539] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The description of the biological effects of ionizing radiation requires a good knowledge of the dose deposition processes at both the cellular and molecular scales. However, experimental studies on the energy deposition specificity of sub-keV electrons, produced by most radiations, including high-energy photons and heavy ions, are scarce. Soft X-rays (0.2-2 keV) are here used to probe the physical and physico-chemical events occurring upon exposure of liquid water to sub-keV electrons. Liquid water samples were irradiated with a monochromatic photon beam at the SOLEIL synchrotron. Hydroxyl radical quantification was conducted through HO• scavenging using benzoate to form fluorescent hydroxybenzoate. The yields of HO• radicals exhibit a minimum around 1.5 keV, in good agreement with indirect observation. Moreover, they are relatively independent of the benzoate concentration in the range investigated, which corresponds to scavenging times of 170 ns to 170 ps. These results provide evidence that sub-keV electrons behave as high linear energy transfer particles, since they are able to deposit tens to hundreds of electronvolts in nanometric volumes.
Collapse
Affiliation(s)
- Lucie Huart
- IMPMC, Sorbonne Université, UMR CNRS 7590, MNHN, Paris 75252, France.,Synchrotron SOLEIL, Saint Aubin 91190, France.,Université Paris-Saclay, CEA, CNRS, NIMBE, Gif-sur-Yvette 91191, France
| | | | | | | | - Alain Touati
- IMPMC, Sorbonne Université, UMR CNRS 7590, MNHN, Paris 75252, France
| | - Marie-Françoise Politis
- LAMBE UMR 8587, Université d'Evry val d'Essonne, CNRS, CEA, Université Paris-Saclay, Evry 91025, France
| | | | | | | | | |
Collapse
|
3
|
Affiliation(s)
- Akinari Yokoya
- Quantum Beam Science Research Directorate, National Institutes for Quantum and Radiological Science and Technology, Naka, Ibaraki, Japan
| | - Takashi Ito
- Graduate School of Arts and Sciences, The University of Tokyo, Komaba, Tokyo, Japan
| |
Collapse
|
4
|
Hervé du Penhoat MA, Kamol Ghose K, Gaigeot MP, Vuilleumier R, Fujii K, Yokoya A, Politis MF. Investigation of the fragmentation of core-ionised deoxyribose: a study as a function of the tautomeric form. Phys Chem Chem Phys 2015; 17:32375-83. [DOI: 10.1039/c5cp05196g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fragmentation dynamics following the core ionisation of isolated 2-deoxy-d-ribose by DFT-MD simulations.
Collapse
Affiliation(s)
| | | | | | - Rodolphe Vuilleumier
- Ecole Normale Supérieure
- Département de Chimie
- UMR 8640 CNRS-ENS-UPMC
- 75005 Paris
- France
| | - Kentaro Fujii
- Advance Science Research Center
- Japan Atomic Energy Agency
- Tokai
- Japan
| | - Akinari Yokoya
- Advance Science Research Center
- Japan Atomic Energy Agency
- Tokai
- Japan
| | | |
Collapse
|
5
|
du Penhoat MAH, Eschenbrenner A, Abel F, Boissiere A, Guigner JM, Chetioui A, Politis MF, Touati A, Sage E, Jenner TJ, Stevens DL, Hill MA. Double-strand break induction and repair in V79-4 hamster cells: the role of core ionisations, as probed by ultrasoft X-rays. Int J Radiat Biol 2010; 86:205-19. [PMID: 20201649 DOI: 10.3109/09553000903419296] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
PURPOSE To compare the induction of double-strand breaks (DSB) in cells irradiated by 250 and 350 eV ultrasoft X-rays and assess the residual yield of breaks 2 hours post irradiation in order to unravel the correlation between the sharp increase in cell-killing efficiency of ultrasoft X-rays above versus below the carbon-K threshold (284 eV) and the induction of core events in DNA atoms. MATERIALS AND METHODS V79-4 hamster cells were irradiated with synchrotron ultrasoft X-rays at isoattenuating energies of 250 eV and 350 eV. DSB were quantified using pulse field gel electrophoresis. RESULTS A significant increase in DSB induction was observed for 350 eV ultrasoft X-rays above the carbon-K threshold, compared to 250 eV below the threshold, per unit dose to the cell. The DSB induced by the 350 eV ultrasoft X-rays were less repaired 2 h after irradiation. CONCLUSION The increased DSB induction at 350 eV is attributed to the increase in the relative proportion of photon interactions in DNA resulting in significant dose inhomogeneity across the cell with a local increase in dose to DNA. It results from an increase in carbon-K shell interactions and the short range of the electrons produced. Core ionisations in DNA, through core-hole relaxation in conjunction with localised effects of spatially correlated low-energy photo- and Auger-electrons lead to an increase in number and the complexity of DSB.
Collapse
Affiliation(s)
- Marie-Anne Hervé du Penhoat
- Institut de Minéralogie et de Physique des Milieux Condensés, Université Pierre et Marie Curie-Paris6, UMR-CNRS 7590, Paris, France.
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
6
|
Eschenbrenner A, Herve Du Penhoat MA, Boissiere A, Eot-Houllier G, Abel F, Politis MF, Touati A, Sage E, Chetioui A. Strand breaks induced in plasmid DNA by ultrasoft X-rays: Influence of hydration and packing. Int J Radiat Biol 2009; 83:687-97. [PMID: 17729163 DOI: 10.1080/09553000701584106] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
PURPOSE To study the effect of hydration level and plasmid packing on strand break induction in DNA by ultrasoft X-ray. MATERIALS AND METHODS Bluescript (pBS, tight packing) and pSP189 (pSP, loose packing) plasmids were irradiated by 250, 380, and 760 eV ultrasoft X-rays at the Laboratoire pour l'Utilisation du Rayonnement Electromagnétique synchrotron facility (Orsay, France). Single and double strand breaks (SSB and DSB) were quantified by gel electrophoresis. RESULTS The number of DSB per Gray and per Dalton in pBS plasmids were (5.6 +/- 0.1), (6.3 +/- 0.1) and (8.5 +/- 0.4)x10(-12) at 250, 380 and 760 eV, respectively. They were respectively 1.4 +/- 0.1, 1.1 +/- 0.1 and 1.9 +/- 0.2 times larger for pSP plasmids. SSB/DSB ratios varied between 4.4 and 6.4. CONCLUSION The observed dependency of strand break induction by ultrasoft X-rays on the hydration level of DNA in plasmids films may be associated with: (i) Damage transfer from the water shell to the DNA and/or (ii) change in packing. 760 eV photons which are more often absorbed in the hydration shell and yield longer range electrons than 250 and 380 eV photons, induce more DSB per Gray and per Dalton, especially for the looser plasmid (pSP).
Collapse
Affiliation(s)
- A Eschenbrenner
- Institut de Minéralogie et de Physique des Milieux Condensés, Université Pierre et Marie Curie-Paris6, Paris, France
| | | | | | | | | | | | | | | | | |
Collapse
|
7
|
van Oven C, Krawczyk PM, Stap J, Melo AM, Piazzetta MHO, Gobbi AL, van Veen HA, Verhoeven J, Aten JA. An ultrasoft X-ray multi-microbeam irradiation system for studies of DNA damage responses by fixed- and live-cell fluorescence microscopy. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2009; 38:721-8. [PMID: 19495740 PMCID: PMC2701496 DOI: 10.1007/s00249-009-0472-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/27/2009] [Revised: 04/20/2009] [Accepted: 04/29/2009] [Indexed: 12/27/2022]
Abstract
Localized induction of DNA damage is a valuable tool for studying cellular DNA damage responses. In recent decades, methods have been developed to generate DNA damage using radiation of various types, including photons and charged particles. Here we describe a simple ultrasoft X-ray multi-microbeam system for high dose-rate, localized induction of DNA strand breaks in cells at spatially and geometrically adjustable sites. Our system can be combined with fixed- and live-cell microscopy to study responses of cells to DNA damage.
Collapse
Affiliation(s)
- Carel van Oven
- Department of Cell Biology and Histology, Center for Microscopical Research, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | | | | | | | | | | | | | | | | |
Collapse
|
8
|
Boissière A, Champion C, Touati A, Hervé du Penhoat MA, Sabatier L, Chatterjee A, Chetioui A. DNA Core Ionization and Cell Inactivation. Radiat Res 2007; 167:493-500. [PMID: 17388690 DOI: 10.1667/rr0451.1] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2005] [Accepted: 11/18/2006] [Indexed: 11/03/2022]
Abstract
Whether inner-shell ionizations of DNA atoms, called core ionizations, are critical events for cell inactivation by ionizing radiations such as 100 keV electrons and gamma rays has been investigated. The number of core ionizations in DNA atoms per gray of the two types of radiations is calculated from various Monte Carlo track simulations. The probability that a core ionization leads to cell inactivation is deduced from experimental values of the RBEs of ultrasoft X rays. The contribution to V79 cell inactivation solely due to the core ionizations in DNA is found to be 75 +/- 27% for energetic electrons and gamma rays. This surprisingly large contribution strongly suggests the presence of new mechanisms associated with critical lesions for cell inactivation.
Collapse
Affiliation(s)
- Arnaud Boissière
- Life Sciences Division, Lawrence Berkeley National Laboratory, California 94720, USA.
| | | | | | | | | | | | | |
Collapse
|