DNA Topoisomerase I and Illegitimate Recombination

Part of the Cancer Drug Discovery and Development book series (CDD&D)


DNA topoisomerase IB (Top1) is a ubiquitous nuclear enzyme whose main role is to remove torsional tensions associated with transcription or replication by introducing transient single-strand breaks in duplex DNA. Once supercoils are suppressed, DNA breaks are rapidly resealed during the religation step of the Top1 reaction. The striking similarity between Top1-mediated religation and the strand transferase activity of various recombinases have suggested that Top1 could be involved in DNA recombination and contribute to the maintenance of genomic integrity. Moreover, Top1 is routinely used as a reagent for molecular cloning (Topo® PCR cloning). In this chapter, we will review the experimental evidences suggesting the potential role of Top1 in illegitimate recombination either via its strand transferase activity, or independently of its religation activity via the regulation of other cellular mechanisms such as transcription or DNA repair.


Hydroxyl Terminus Strand Transfer Top1 Site Holliday Junction Illegitimate Recombination 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  1. 1.INSERM U916 VINCOInstitut Bergonié & University of BordeauxBordeaux cedexFrance
  2. 2.INSERM U916 VINCOInstitut Bergonié & University of BordeauxBordeaux cedexFrance

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