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Absence of persistence and transfer of genetic material by recombinantEscherichia coli in conventional, antibiotic-treated mice

  • Environmental Fate Issues: In Vivo Studies
  • Published:
Journal of Industrial Microbiology

Summary

Strain BST-1 is a derivative ofEscherichia coli K-12 that carries a plasmid designated pURA-4 and is the expression system used by The Upjohn Company in the production of recombinant bovine somatotropin (rbSt). This plasmid also encodes an ampicillin resistance gene. The plasmidless carrier strain, BST-1C, contains a gene for tetracycline resistance which is provided by the chromosomal insertion of the transposon Tn10. Therefore, BST-1 is resistant to ampicillin and tetracycline, while BST-1C is resistant only to tetracycline. The Food and Drug Administration requested that we conduct an environmental assessment study to monitor the ‘persistence of the recombinant live K-12E. coli organism compared to the hostE. coli organism’. In addition, we were requested to monitor ‘the potential transfer of genetic material from (our) recombinant organism to the indigenous microflora’ of the mouse gastrointestinal (GI) tract. The differences in persistence were determined by monitoring shedding of BST-1 and BST-1C in the feces of conventionally reared, outbred mice inoculated with either of the two strains. Even with antibiotic selective pressure applied (tetracycline in the water), BST-1 did not persist as well as the non-plasmid carrying parental stain, BST-1C. In the gene transfer experiments, transfer of pURA-4 was monitored by the appearance of the ampicillin resistance marker and/or by hybridization assays for the rbSt gene in indigenous, mouse-colonizingE. coli strains which had been made streptomycin resistant. At the limit of detection, no transfer of pURA-4 was detected either in vitro or in vivo. These data support an interpretation that BST-1 does not present an environmental hazard as measured by colonization/persistence in the gut of conventionally reared mammals.

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Yancey, R.J., Kotarski, S.F., Thurn, K.K. et al. Absence of persistence and transfer of genetic material by recombinantEscherichia coli in conventional, antibiotic-treated mice. Journal of Industrial Microbiology 11, 259–271 (1993). https://doi.org/10.1007/BF01569599

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