+1 Recommend
0 collections
      • Record: found
      • Abstract: found
      • Article: not found

      Biological containment of genetically modified Lactococcus lactis for intestinal delivery of human interleukin 10.

      Nature biotechnology

      Amino Acid Sequence, Animals, Cell Division, Cell Survival, Colitis, microbiology, therapy, Drug Delivery Systems, methods, Gene Expression Regulation, Bacterial, physiology, Genetic Engineering, Humans, Ileum, Interleukin-10, genetics, metabolism, therapeutic use, Lactococcus lactis, cytology, growth & development, Molecular Sequence Data, Mutagenesis, Site-Directed, Probiotics, Protein Engineering, Swine, Thymidylate Synthase, deficiency

      Read this article at

          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.


          Genetically modified Lactococcus lactis secreting interleukin 10 provides a therapeutic approach for inflammatory bowel disease. However, the release of such genetically modified organisms through clinical use raises safety concerns. In an effort to address this problem, we replaced the thymidylate synthase gene thyA of L. lactis with a synthetic human IL10 gene. This thyA- hIL10+ L. lactis strain produced human IL-10 (hIL-10), and when deprived of thymidine or thymine, its viability dropped by several orders of magnitude, essentially preventing its accumulation in the environment. The biological containment system and the bacterium's capacity to secrete hIL-10 were validated in vivo in pigs. Our approach is a promising one for transgene containment because, in the unlikely event that the engineered L. lactis strain acquired an intact thyA gene from a donor such as L. lactis subsp. cremoris, the transgene would be eliminated from the genome.

          Related collections

          Author and article information



          Comment on this article