Visualization and quantification of topoisomerase–DNA covalent complexes using the trapped in agarose immunostaining (TARDIS) assay

Cowell, IG; Austin, CA

doi:10.1007/978-1-4939-7459-7_21

Visualization and quantification of topoisomerase–DNA covalent complexes using the trapped in agarose immunostaining (TARDIS) assay

Lookup NU author(s): Dr Ian Cowell ORCiD, Professor Caroline Austin ORCiD

Downloads

Full text for this publication is not currently held within this repository. Alternative links are provided below where available.

Abstract

© 2018, Springer Science+Business Media, LLC.The TARDIS assay was originally developed as a means of detecting and quantifying melphalan and cisplatin DNA adducts at the single cell level, but it has since been adapted to quantify topoisomerase DNA complexes that result from the actions of topoisomerase poisons and this is currently the main use of the assay. The method employs sensitive immunofluorescent detection to quantify topoisomerase molecules covalently coupled to DNA in what are often referred to as cleavage complexes. Free topoisomerase molecules, and other cellular constituents are first removed using salt-detergent extraction of agarose-embedded, unfixed cells. Using these stringent extraction conditions, genomic DNA remains in place in the agarose as “nuclear ghosts,” and any covalent attached molecules can be detected and quantified by immunofluorescence with a low background.