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The Comet-FISH Assay for the Analysis of DNA Damage and Repair

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In this chapter, I describe the alkaline single-cell gel electrophoresis (Comet assay) combined with fluorescence in situ hybridization (FISH) technology, used in our laboratory, to study the incidence and repair of lesions induced in human cells by ultraviolet light. The Comet-FISH method permits the simultaneous and comparative analysis of DNA damage and its repair throughout the genome and in defined chromosomal regions. This very sensitive approach can be applied to any lesion, such as those induced by chemical carcinogens and products of cellular metabolism that can be converted to DNA single- or double-strand breaks. The unique advantages and limitations of the method for particular applications are discussed.
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