Transposon Mutagenesis in Streptococcus Species

  • Martin Nilsson
  • Michael Givskov
  • Tim Tolker-NielsenEmail author
Part of the Methods in Molecular Biology book series (MIMB, volume 2016)


Mutant libraries, generated by transposons and screened for various phenotypes, have led to many important discoveries regarding gene functions in various organisms. In this chapter we describe the use of plasmid pMN100, a transposon vector constructed to perform in vivo transposition primarily in oral streptococci. Compared to in vitro transposition systems the conditional replicative features of the plasmid, and the inducible expression of the mariner Himar1 transposase, makes pMN100 particularly useful for bacterial strains showing a low transformation frequency. We outline how to transform plasmid pMN100 into Streptococcus mutans, carry out transposon mutagenesis, and determine the chromosomal location of inserted transposons. It is our prospect that the protocols can be used as guidelines for transposon mutagenesis in S. mutans as well as other species of streptococci.

Key words

In vivo transposon mutagenesis Mariner pMN100 Streptococci 



This work was supported by grants from the Danish Council for Independent Research and the Lundbeck Foundation.


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Martin Nilsson
    • 1
  • Michael Givskov
    • 1
    • 2
  • Tim Tolker-Nielsen
    • 1
    Email author
  1. 1.Department of Immunology and Microbiology, Faculty of Health and Medical Sciences, Costerton Biofilm CenterUniversity of CopenhagenCopenhagenDenmark
  2. 2.Singapore Center for Environmental Life Sciences EngineeringNanyang Technological UniversitySingaporeSingapore

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