Study of a Conditional Suicide System for Biological Containment of Bacteria in Germ-free Rats

作者：Bodil Lund Jacobsen, Jørgen Schlundt, Gerhart W. Fischer · 发表于：Microbial Ecology in Health and Disease · 年份：1993 · DOI：10.3109/08910609309141314 · 被引用次数：4 · 研究领域：Escherichia coli research studies、Vibrio bacteria research studies、Bacterial Genetics and Biotechnology

The effect of a biological containment system in Escherichia coli based on the stochastic induction of a lethal gene, hok,8 was investigated in the gastrointestinal system of 33 germ-free rats. E. coliBJ16, identical to E. coli BJ4 originally isolated from a rat, but containing a plasmid pPKL100 with the hok gene, was given to germ-free rats. In these rats a plasmid-free and a plasmid-containing population was formed and co-existed in the gut. When given to gnotobiotic rats which had been initially monoassociated with E. coli BJ4, the E. coli BJ16 (hok +) was eliminated at a faster rate than E. coli BJ17, identical to E. coli BJ4 but carrying a plasmid pMG33 without the hok gene. Expressed as T90, the time used for a 90 per cent reduction of the bacterial concentration, the mean elimination for E. coli BJ16 (hok +) was 2.8 d and for E. coli BJ17 (hok-) was 5.3 d, indicating an effect of the hok gene in a competition situation.