A modified fluorimetric neutral filter elution method for analyzing radiation-induced double strand break and repair.

Goutham, Venkatesh H and Mumbrekar, Kamalesh Dattaram and Guruprasad, Parashiva K and Vadhiraja, BM and Satyamoorthy, K and Rao, Satish BS (2011) A modified fluorimetric neutral filter elution method for analyzing radiation-induced double strand break and repair. Analytical Biochemistry, 414 (2). pp. 287-293. ISSN 0003-2697

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Abstract

Neutral filter elution assay is one of the methods used for detection of DNA double strand breaks (DSBs). However, it is laborious, expensive, and hazardous (radiolabeled precursors for DSB detection and scintillation counter for quantification), making it a less preferred method for DSB detection. In the present study, an attempt was made to improve the existing neutral filter elution assay by making use of fluorescent dye (PicoGreen) and microfiltration assembly for eluting the fragmented DNA, thereby reducing the cost and time required for the assay. We studied the effect of dye dilution, pH conditions, and cell number as a part of method standardization. X-ray dose-response and repair kinetics in lymphocytes as well as cell lines were studied for validating the sensitivity of the assay. A linear dose-response relationship for DSBs was observed at a cell number of 4×10(5)cells, a dye dilution of 500-fold, and at pH 10. Repair kinetics revealed a time-dependent repair of DSBs up to 360 min of posttreatment, indicating its usefulness in DSB repair studies. In conclusion, the present modified method is more efficient (in terms of cell number), cost effective, less time-consuming, and less hazardous compared to the existing method.

Item Type: Article
Uncontrolled Keywords: Neutral filter elution; DNA damage and repair; PicoGreen; Lymphocyte
Subjects: Life Sciences > MLSC Manipal
Medicine > KMC Manipal > Radiotherapy and Oncology
Depositing User: KMC Manipal
Date Deposited: 07 Feb 2012 09:39
Last Modified: 11 Dec 2015 09:20
URI: http://eprints.manipal.edu/id/eprint/2849

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