Detection of labeled abasic sites in damaged DNA by capillary electrophoresis with laser-induced fluorescence

College

College of Science

Department/Unit

Chemistry

Document Type

Article

Source Title

Analytical and Bioanalytical Chemistry

Volume

387

Issue

5

First Page

1883

Last Page

1890

Publication Date

3-2007

Abstract

Removal of nucleobases from the DNA backbone leads to the formation of abasic sites. The rate of abasic site formation is significantly increased for chemically damaged nucleobases. Thus, abasic sites serve as general biomarkers for the quantification of DNA damage. Herein, we show that capillary electrophoresis with laser-induced fluorescence (CE-LIF) can be used to detect the amount of abasic sites with very high sensitivity. For proof of concept, DNA was incubated with methylmethane sulfonate (MMS) and the damaged bases were removed by incubation at 80 degrees C. The resulting abasic sites were then tagged with a fluorescent aldehyde-reactive probe (FARP). The DNA was precipitated with ethanol, and then analyzed by CE-LIF. CE-LIF and HPLC analysis shows that the fluorescently tagged DNA (DNA-FARP) had a peak area directly proportional to the amount of N-7 methyl guanines. The CE-LIF method had a detection limit of 1.2 abasic sites per 1,000,000 bases or ca. 20 attomoles of abasic sites. This provides a general method for detecting DNA damage that is not only faster but also has comparable or better sensitivity than the alternative ELISA-like method.

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Digitial Object Identifier (DOI)

10.1007/s00216-006-1041-x

Disciplines

Biochemistry | Chemistry

Keywords

Capillary electrophoresis; DNA damage; Laser-induced fluorescence

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