Near-Ambient-Pressure XPS to investigate radiation damage to DNA
- X-ray photoelectron-spectroscopy (XPS) allows simultaneous irradiation and damage monitoring. Although water radiolysis is essential for radiation damage, all previous XPS studies were performed in vacuum. Here we present near-ambient-pressure XPS experiments to directly measure DNA damage under water atmosphere. They permit in-situ monitoring of the effects of radicals on fully hydrated double-stranded DNA. Our results allow us to distinguish direct damage, by photons and secondary low-energy electrons (LEE), from damage by hydroxyl radicals or hydration induced modifications of damage pathways. The exposure of dry DNA to x-rays leads to strand-breaks at the sugar-phosphate backbone, while deoxyribose and nucleobases are less affected. In contrast, a strong increase of DNA damage is observed in water, where OH-radicals are produced. In consequence, base damage and base release become predominant, even though the number of strand-breaks increases further.
Autor*innen: | Marc Benjamin HahnORCiD |
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Koautor*innen: | Jörg RadnikORCiD, P. M. Dietrich |
Dokumenttyp: | Vortrag |
Veröffentlichungsform: | Präsentation |
Sprache: | Englisch |
Jahr der Erstveröffentlichung: | 2021 |
Organisationseinheit der BAM: | 6 Materialchemie |
6 Materialchemie / 6.1 Oberflächen- und Dünnschichtanalyse | |
6 Materialchemie / 6.6 Physik und chemische Analytik der Polymere | |
DDC-Klassifikation: | Naturwissenschaften und Mathematik / Chemie / Analytische Chemie |
Freie Schlagwörter: | Base damage; Base loss; Cancer therapy; DNA; DNA radiation damage; DSB; Direct damage; Dissociative electron attachment (DEA); Dissociative electron transfer (DET); Dosimetry; Double-strand break; Dry DNA; Geant4; Geant4-DNA; Hydrated DNA; Hydrated electron; Hydration shell; Hydroxyl radical; Indirect damage; Ionization; LEE; Low energy electrons; Microdosimetry; NAP-XPS; Near ambient pressure xray photo electron spectroscopy; Net-ionization reaction; OH radical; PES; Prehydrated electron; Quasi-direct damage; ROS; Radiation damage; Radiation therapy; Radical; Reactive oxygen species; SSB; Single-strand break; TOPAS; XPS; Xray; Xray photo electron spectrocopy TOPAS-nbio |
Themenfelder/Aktivitätsfelder der BAM: | Chemie und Prozesstechnik |
Veranstaltung: | Physical and Chemical Analysis of Polymers seminar |
Veranstaltungsort: | Online meeting |
Beginndatum der Veranstaltung: | 12.10.2021 |
Enddatum der Veranstaltung: | 12.10.2021 |
Zugehöriger Identifikator: | https://www.nature.com/articles/s42004-021-00487-1 |
Verfügbarkeit des Dokuments: | Datei im Netzwerk der BAM verfügbar ("Closed Access") |
Datum der Freischaltung: | 26.10.2021 |
Referierte Publikation: | Nein |
Eingeladener Vortrag: | Nein |