Strand Breakage in Solutions of DNA and Ethidium Bromide Exposed to Visible Light

Overview

Journal Nucleic Acids Res

Publisher Oxford University Press

Specialty Biochemistry

Date 1977 Jan 1

PMID 896466

Citations 2

Authors

P A Martens

D A Clayton

Affiliations

Soon will be listed here.

Abstract

Breaks are introduced into DNA strands when DNA solutions containing ethidium bromide (EB) are exposed to incandescent light. The nicking rate is sensitive to the concentration of EB and the light intensity. At short exposure times, this rate is limited by photon capture and formation of an intermediate capable of nicking DNA and zero-order nicking kinetics are observed. If the EB is pre-irradiated, the nicking rate is limited by DNA concentration and first-order nicking kinetics are observed. The nicking rate is not greatly affected by the presence of a low frequency of ribonucleotides in the duplex structure. The nicking reaction produces neither double-strand breaks nor interstrand crosslinks. The nicks produced cannot be closed by DNA ligase. The fluorescent light intensities under normal laboratory conditions are insufficient to induce significant nicking.

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