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Nikjoo, H. et al.

Nikjoo, Panyutin, Terrissol, Vrigneaud, Laughton,

Distribution of strand breaks produced by Auger electrons in decay of 125I in triplex DNA.

In this study we investigate the possibility of using Auger electrons as a probing agent for the study of structures of nucleic acids. To this end, we present the distribution of breaks produced in strands of a DNA duplex and a triplex-forming oligonucleotide (TFO) carrying Auger emitting radionuclide 125I. The method of calculation includes use of a molecular model of plasmid DNA duplex with bound TFO carrying a labelled 125I at position C5 of a single deoxycytosine residue, a source of Auger spectra, Monte Carlo electron track structure and the ensuing chemistry codes, to simulate the distribution of breaks produced in both strands of a plasmid DNA. Frequencies of fragment length distributions were obtained for the TFO, the purine and the pyrimidine strands. The frequency of breaks in the purine strand showed good correlation with the published experimental results, while that for the pyrimidine strand is lower by a factor of 3. It is concluded that the true structure of triplex DNA may not be purely of B-form.[1]

References

Distribution of strand breaks produced by Auger electrons in decay of 125I in triplex DNA. Nikjoo, H., Panyutin, I.G., Terrissol, M., Vrigneaud, J.M., Laughton, C.A. Acta oncologica (Stockholm, Sweden) (2000) [Pubmed]

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