Affiliation:
1. Yakult Central Institute for Microbiological Research, 1796 Yaho, Kunitachi, Tokyo 186-8650,1
2. Graduate School of Agriculture and Agricultural Life Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-8657,2 and
3. School of Medicine, Nagasaki University, 1-12-4 Sakamoto, Nagasaki-shi, Nagasaki 852-8523,3 Japan
Abstract
ABSTRACT
In order to clarify the distribution of bifidobacterial species in the human intestinal tract, a 16S rRNA-gene-targeted species-specific PCR technique was developed and used with DNAs extracted from fecal samples obtained from 48 healthy adults and 27 breast-fed infants. To cover all of the bifidobacterial species that have been isolated from and identified in the human intestinal tract, species-specific primers for
Bifidobacterium longum
,
B. infantis
,
B. dentium
, and
B. gallicum
were developed and used with primers for
B. adolescentis
,
B. angulatum
,
B. bifidum
,
B. breve
, and the
B. catenulatum
group (
B. catenulatum
and
B. pseudocatenulatum
) that were developed in a previous study (T. Matsuki, K. Watanabe, R. Tanaka, and H. Oyaizu, FEMS Microbiol. Lett. 167:113–121, 1998). The specificity of the nine primers was confirmed by PCR, and the species-specific PCR method was found to be a useful means for identifying
Bifidobacterium
strains isolated from human feces. The results of an examination of bifidobacterial species distribution showed that the
B. catenulatum
group was the most commonly found taxon (detected in 44 of 48 samples [92%]), followed by
B. longum
and
B. adolescentis
, in the adult intestinal bifidobacterial flora and that
B. breve
,
B. infantis
, and
B. longum
were frequently found in the intestinal tracts of infants. The present study demonstrated that qualitative detection of the bifidobacterial species present in human feces can be accomplished rapidly and accurately.
Publisher
American Society for Microbiology
Subject
Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology
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