Localization estimation of ionizing radiation-induced abasic sites in DNA in the solid state using fluorescence resonance energy transfer.

Abstract:

:Clustered DNA damage is considered an important factor in determining the biological consequences of ionizing radiation. In this study, we successfully estimated the localization of abasic sites (APs) in DNA exposed to ionizing radiation using fluorescence resonance energy transfer (FRET) without any involvement of repair enzyme functions. A linearized plasmid (pUC19 digested by Sma I) was irradiated with: (60)Co γ rays; (4)He(2+) (2.0 MeV/u) particles; and the (12)C(5+) (0.37 MeV/u) particles in the solid state. A donor or acceptor fluorescent probe with a nucleophilic O-amino group was used to label APs. The results showed that the (12)C(5+) particle likely produced close APs within a track. The apparent distance calculated from the observed FRET efficiency (E) of around 0.10 was estimated to be approximately 17 base pairs. On the other hand, E values of (60)Co γ rays and the (4)He(2+) beam were less than those of the (12)C(5+) beam, increased with increasing AP density (the average number of APs per base pair), and were slightly greater than those of randomly distributed APs. We propose that the FRET method provides a degree of localization regardless of whether an AP cluster is single-stranded or bistranded DNA damage.

journal_name

Radiat Res

journal_title

Radiation research

authors

Akamatsu K,Shikazono N,Saito T

doi

10.1667/RR13780.1

subject

Has Abstract

pub_date

2015-01-01 00:00:00

pages

105-13

issue

1

eissn

0033-7587

issn

1938-5404

journal_volume

183

pub_type

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