Louise Feld

A standardized conjugation protocol to asses antibiotic resistance transfer between lactococcal species

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

  • Joanna Lampkowska, Institute of Biochemistry and Biophysics of the Polish Academy of Sciences
  • ,
  • Louise Feld
  • Aine Monaghan, Teagase-Ashtown Food Research Centre
  • ,
  • Niamh Toomey, Teagase-Ashtown Food Research Centre
  • ,
  • Susanne Schjørring, Statens Serum Institut
  • ,
  • Bodil Jacobsen, Chr. Hansen A/S
  • ,
  • Hilko van der Voet, Wageningen University and Research Centre
  • ,
  • Sigrid Rita Andersen, Technical University of Denmark
  • ,
  • Declan Bolton, Teagase-Ashtown Food Research Centre
  • ,
  • Henk Aarts, Wageningen University and Research Centre
  • ,
  • Karen A. Krogfelt, Statens Serum Institut
  • ,
  • Andrea Wilcks, Technical University of Denmark
  • ,
  • Jacek Bardowski, Institute of Biochemistry and Biophysics of the Polish Academy of Sciences

Optimal conditions and a standardized method for conjugation between two model lactococcal strains, Lactococcus lactis SH4174 (pAMβ1-containing, erythromycin resistant donor) and L. lactis Bu2-60 (plasmid-free, erythromycin sensitive recipient), were developed and tested in a inter-laboratory experiments involving five laboratories from different countries. The ultimate goal of the study was to assess the microbial potential of antibiotic resistance transfer among Lactic Acid Bacteria (LAB). The influence of culture age (various OD values) and ratios of donor and recipient cultures as well as filter, solid and liquid mating techniques, were examined in order to optimize the conjugation protocol. In the result of these studies, we concluded that the donor-to-recipient ratio appear to be important; the most efficient technique for conjugation was filter mating and the optimal conditions for gene transfer were observed when late logarithmic cultures of both donor and recipient were used. Comparison of conjugal transfer frequencies between five partner laboratories showed that results are sufficiently intra-laboratory repeatable and inter-laboratory comparable. This is the first study of this kind, in which a standardized protocol of conjugal mating for testing antibiotic resistance dissemination among LAB was established and validated.

Original languageEnglish
JournalInternational Journal of Food Microbiology
Pages (from-to)172-175
Number of pages4
Publication statusPublished - 30 Sep 2008
Externally publishedYes

    Research areas

  • Antibiotic resistance, Conjugation, Lactococcus lactis, Plasmids, Standardization

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