Abstract
The in vitro replication assay described here measures bidirectional replication of a circular double- stranded DNA template upon initiation at the SV40 origin. It models a single eukaryotic replication unit (replicon) and recapitulates the biochemical steps involved in the catalysis of both leading and lagging strand synthesis during semiconservative DNA replication. Except for the SV40 large T antigen, all other proteins necessary for initiation and assembly of functional replication forks are provided by the cell-free extract. This assay can be used to demonstrate bypass replication of genotoxic lesions. It supports replication across a specific damaged site on the template DNA (i.e., translesion synthesis) by specialized DNA polymerases. This chapter illustrates the efficient translesion synthesis of UV-induced thymine dimers by DNA polymerase eta.
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Acknowledgement
This research was supported by the US Public Health Service Award CA55065 from the National Cancer Institute, National Institutes of Health. We thank Dr. Tadayoshi Bessho for assistance in preparing lesion-containing oligonucleotides and Dr. Stephen Chaney for access to HPLC equipment (Department of Biochemistry and Biophysics, UNC Chapel Hill). We are grateful to Dr. Thomas Kunkel (NIEHS) for the gift of M13mp2SV oriL and oriR. We thank Dr. John J. McNulty for reading the manuscript.
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Nikolaishvili-Feinberg, N., Cordeiro-Stone, M. (2012). Assays of Bypass Replication of Genotoxic Lesions in Cell-Free Extracts. In: Bjergbæk, L. (eds) DNA Repair Protocols. Methods in Molecular Biology, vol 920. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-61779-998-3_34
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DOI: https://doi.org/10.1007/978-1-61779-998-3_34
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