Previous Article | Next Article ![]()
Appl. Environ. Microbiol., Jul 1995, 2771-2774, Vol 61, No. 7
N Klijn, AH Weerkamp and WM de Vos
A human feeding study was performed with Lactococcus lactis TC165.5, which
is genetically marked by insertion of the sucrose-nisin conjugative
transposon Tn5276 and chromosomal resistance to rifampin and streptomycin.
The fate of strain TC165.5 and its nucleic acids was monitored by
conventional plating methods and by molecular detection techniques based on
specific PCR amplification of the nisin (nisA) gene from DNA extracted from
human feces. A method was developed for the efficient extraction of
microbial DNA from human feces. The results show that a fraction of viable
cells of L. lactis TC165.5 survived passage through the human
gastrointestinal tract. Only cells that passed within 3 days of ingestion
could be recovered from the feces of the volunteers, and they accounted for
approximately 1% of the total number of cells consumed. The presence of
nisA in DNA extracted from feces could be detected up to 4 days, when
viable cells were no longer present.
Copyright © 1995, American Society for Microbiology
Genetic marking of Lactococcus lactis shows its survival in the human gastrointestinal tract
Department of Microbiology, Netherlands Institute for Dairy Research (NIZO), Ede.
This article has been cited by other articles:
Copyright © 2009 by the American Society for Microbiology. For an alternate route to Journals.ASM.org, visit: http://intl-journals.asm.org | More Info»