Detection of <i>Lactobacillus, Pediococcus, Leuconostoc</i> , and <i>Weissella</i> Species in Human Feces by Using Group-Specific PCR Primers and Denaturing Gradient Gel Electrophoresis

Applied and Environmental Microbiology - Tập 67 Số 6 - Trang 2578-2585 - 2001
Jens Walter1, Christian Hertel1, Gerald W. Tannock2, Claudia M. Lis1, Karen Munro2, Walter P. Hammes1
1Institute of Food Technology, University of Hohenheim, Stuttgart, Germany,1 and
2Department of Microbiology, University of Otago, Dunedin, New Zealand2

Tóm tắt

ABSTRACT Denaturing gradient gel electrophoresis (DGGE) of DNA fragments generated by PCR with 16S ribosomal DNA-targeted group-specific primers was used to detect lactic acid bacteria (LAB) of the genera Lactobacillus, Pediococcus, Leuconostoc , and Weissella in human feces. Analysis of fecal samples of four subjects revealed individual profiles of DNA fragments originating not only from species that have been described as intestinal inhabitants but also from characteristically food-associated bacteria such as Lactobacillus sakei, Lactobacillus curvatus, Leuconostoc mesenteroides , and Pediococcus pentosaceus . Comparison of PCR-DGGE results with those of bacteriological culture showed that the food-associated species could not be cultured from the fecal samples by plating on Rogosa agar. On the other hand, all of the LAB species cultured from feces were detected in the DGGE profile. We also detected changes in the types of LAB present in human feces during consumption of a milk product containing the probiotic strain Lactobacillus rhamnosus DR20. The analysis of fecal samples from two subjects taken before, during, and after administration of the probiotic revealed that L. rhamnosus was detectable by PCR-DGGE during the test period in the feces of both subjects, whereas it was detectable by culture in only one of the subjects.

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Applied and Environmental Microbiology

Tập 67 Số 6

2578-2585

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