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Probabilities of radiation-induced inter- and intrachromosomal exchanges and their dependence on the DNA content of the chromosomeA biophysical model has been developed that is based on the assumptions that an interphase chromosome occupies a spherical territory and that chromosome exchanges are formed by the misrejoining of two DNA double-strand breaks induced within a defined interaction distance. The model is used to explain the relative frequencies of inter- and intrachromosomal exchanges and the relationship between radiation-induced aberrations in individual chromosomes and the DNA content of the chromosome. Although this simple model predicts a higher ratio of inter- to intrachromosomal exchanges for low-LET radiation than for high-LET radiation, as has been suggested by others, we argue that the comparison of the prediction of the model with experimental results is not straightforward. With the model, we also show that the probability of the formation of interchromosomal exchanges is proportional to the "surface area" of the chromosome domain plus a correction term. The correction term is small if the interaction distance is less than 1 microm for both low- and high-LET radiations.
Document ID
20040088722
Acquisition Source
Johnson Space Center
Document Type
Reprint (Version printed in journal)
Authors
Wu, H.
(NASA Johnson Space Center Houston TX United States)
Yang, T. C.
Date Acquired
August 21, 2013
Publication Date
November 1, 2001
Publication Information
Publication: Radiation research
Volume: 156
Issue: 5 Pt 2
ISSN: 0033-7587
Subject Category
Life Sciences (General)
Distribution Limits
Public
Copyright
Other
Keywords
NASA Center JSC
NASA Discipline Radiation Health

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