Limitations on the Transposition of TnA

  • P. M. Bennett
  • M. K. Robinson
  • M. H. Richmond
Conference paper
Part of the Topics in Infectious Diseases book series (TIDIS, volume 2)


In the relatively short space of time since the process of transposition has been defined with some precision (4, 13, 14, 15, 19, 22, 23), the number of transposons known to occur in Gramnegative bacteria has increased dramatically. The initial experiments were all concerned with the ampicillin transposon (TnA, now redesignated Tn1, Tn2, Tn3 — see ref.7), but subsequently units which specify the transposition of trimethoprim and streptomycin resistance (Tn7) (2, 7), tetracycline resistance (Tn10) (7, 11, 18), neomycin and kanamycin resistance (Tn5) (5, 7), chloramphenicol resistance (Tn9) (7, 12), and mercury ion resistance (Tn501) (24) have all been characterised with a varying degree of completeness. In all cases in which the phenomenon of transposition has been investigated in sufficient detail, it is known that the process occurs independently of the host’s classical recombination systems (that is, the process will occur in recA bacteria (2, 4, 11, 12, 14, 18, 19, 22, 24) and results in the acquisition of a discrete piece of DNA by the recipient replicon (2, 4, 5, 12, 14, 18, 19, 22, 23, 24). Thus transposition of TnA normally results in an increase in size of the recipient plasmid of a piece of DNA of molecular weight about 3.2 Mdal.


Recombinant Plasmid Resistance Determinant Plasmid Transfer Transfer Frequency Streptomycin Resistance 
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Copyright information

© Springer-Verlag/Wien 1977

Authors and Affiliations

  • P. M. Bennett
  • M. K. Robinson
  • M. H. Richmond

There are no affiliations available

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