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Methods to Study Transcription-Coupled Repair in Chromatin

  • Hélène Gaillard
  • Ralf Erik Wellinger
  • Andrés Aguilera
Part of the Methods in Molecular Biology book series (MIMB, volume 1288)

Abstract

The effect of endogenous and exogenous DNA damage on the cellular metabolism can be studied at the genetic and molecular level. A paradigmatic case is the repair of UV-induced pyrimidine dimers (PDs) by nucleotide excision repair (NER) in Saccharomyces cerevisiae. To follow the formation and repair of PDs at specific chromosome loci, cells are irradiated with UV-light and incubated in the dark to allow repair by NER. Upon DNA isolation, cyclobutane pyrimidine dimers, which account for about 90 % of PDs, can be cleaved in vitro by the DNA nicking activity of the T4 endonuclease V repair enzyme. Subsequently, strand-specific repair in a suitable restriction fragment is determined by denaturing gel electrophoresis followed by Southern blot and indirect end-labeling using a single-stranded DNA probe. Noteworthy, this protocol could potentially be adapted to other kind of DNA lesions, as long as a DNA nick is formed or a lesion-specific endonuclease is available.

Transcription-coupled repair (TC-NER) is a sub-pathway of NER that catalyzes the repair of the transcribed strand of active genes. RNA polymerase II is essential for TC-NER, and its occupancy on a damaged template can be analyzed by chromatin immunoprecipitation (ChIP). In this chapter, we provide an up-dated protocol for both the DNA repair analysis and ChIP approaches to study TC-NER in yeast chromatin.

Key words

DNA damage UV Cyclobutane pyrimidine dimer Nucleotide excision repair Transcription-coupled repair Chromatin immunoprecipitation 

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Hélène Gaillard
    • 1
  • Ralf Erik Wellinger
    • 1
  • Andrés Aguilera
    • 1
  1. 1.Genetics, CABIMERUniversidad de Sevilla-CSICSevilleSpain

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