title: Application of the local effect model to predict DNA double-strand break rejoining after photon and high-LET irradiation.
abstract: In the recent version of the local effect model (LEM), the biological effects of ionising radiation can be well described trough the consideration of DNA double-strand breaks (DSB) clustering at the micrometre scale. Assuming a giant-loop organisation for the chromatin higher-order structure, two classes of DSB are defined, namely isolated (iDSB) and clustered DSB (cDSB), according to whether exactly one or more than one DSB are induced in a loop, respectively. Here, a DSB kinetic rejoining model based on the LEM is applied to the description of two specific aspects of DSB rejoining, namely the dose dependence of the rejoining capacity after photon radiation and the residual damage observed at late times after ion irradiation. Based on the hypothesis that iDSB and cDSB can be associated to the fast and slow components of rejoining, the model is able to reproduce the experimental data, therefore supporting the relevance of micrometre scale clustering of damage for photon radiation as well as for high-LET radiation.
authors: GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany f.tommasino@gsi.de.
authors: F
authors: F
authors: Tommasino
authors: GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany.
authors: T
authors: T
authors: Friedrich
authors: GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany.
authors: U
authors: U
authors: Scholz
authors: GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany.
authors: G
authors: G
authors: Taucher-Scholz
authors: GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany Institut für Festkörperphysik, Technische Universität Darmstadt, Darmstadt, Germany.
authors: M
authors: M
authors: Durante
authors: GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany.
authors: M
authors: M
authors: Scholz
mesh_terms: D003198:Computer Simulation; D053903:DNA Breaks, Double-Stranded / Q000528:radiation effects*; D004260:DNA Repair / Q000528:radiation effects*; D020405:Dermis / Q000528:radiation effects; D004307:Dose-Response Relationship, Radiation; D004583:Electrons; D005347:Fibroblasts / Q000528:radiation effects; D006801:Humans; D018499:Linear Energy Transfer / Q000528:radiation effects*; D008962:Models, Theoretical; D009010:Monte Carlo Method; D017785:Photons; D011839:Radiation, Ionizing; D012062:Relative Biological Effectiveness