PMID: 8955717Dec 1, 1996Paper

Modeling the yield of double-strand breaks due to formation of multiply damaged sites in irradiated plasmid DNA

Radiation Research
M A Xapsos, W K Pogozelski

Abstract

Although double-strand breaks have long been recognized as an important type of DNA lesion, it is well established that this broad class of damage does not correlate well with indicators of the effectiveness of radiation at the cellular level. Assays of double-strand breaks do not distinguish the degree of complexity or clustering of singly damaged sites produced in a single energy deposition event, which is currently hypothesized to be key to understanding cellular end points. As a step toward this understanding, double-strand breaks that are formed proportionally to dose in plasmid DNA are analyzed from the mechanistic aspect to evaluate the yield that arises from multiply damaged sites as hypothesized by Ward (Prog. Nucleic Acid Res. Mol. Biol. 35, 95-125, 1988) and Goodhead (Int. J. Radiat, Biol. 65, 7-17, 1994) as opposed to the yield that arises from single hydroxyl radicals as hypothesized by Siddiqi and Bothe (Radiat. Res. 112, 449-463, 1987). For low-LET radiation such as gamma rays, the importance of multiply damaged sites is shown to increase with the solution's hydroxyl radical scavenging capacity. For moderately high-LET radiation such as 100 keV/micron helium ions, a much different behavior is observed. In this ca...Continue Reading

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