Characterization of bacteria, clostridia and Bacteroides in faeces of vegetarians using qPCR and PCR-DGGE fingerprinting.
OBJECTIVE
This study aimed to investigate the quantitative and qualitative changes of bacteria, Bacteroides, Bifidobacterium and Clostridium cluster IV in faecal microbiota associated with a vegetarian diet.


METHODS
Bacterial abundances were measured in faecal samples of 15 vegetarians and 14 omnivores using quantitative PCR. Diversity was assessed with PCR-DGGE fingerprinting, principal component analysis (PCA) and Shannon diversity index.


RESULTS
Vegetarians had a 12% higher abundance of bacterial DNA than omnivores, a tendency for less Clostridium cluster IV (31.86 +/- 17.00%; 36.64 +/- 14.22%) and higher abundance of Bacteroides (23.93 +/- 10.35%; 21.26 +/- 8.05%), which were not significant due to high interindividual variations. PCA suggested a grouping of bacteria and members of Clostridium cluster IV. Two bands appeared significantly more frequently in omnivores than in vegetarians (p < 0.005 and p < 0.022). One was identified as Faecalibacterium sp. and the other was 97.9% similar to the uncultured gut bacteriumDQ793301.


CONCLUSIONS
A vegetarian diet affects the intestinal microbiota, especially by decreasing the amount and changing the diversity of Clostridium cluster IV. It remains to be determined how these shifts might affect the host metabolism and disease risks.
Liszt
Kathrin
K
Department of Nutritional Sciences, University of Vienna, Vienna, Austria.
Zwielehner
Jutta
J
Handschur
Michael
M
Hippe
Berit
B
Thaler
Roman
R
Haslberger
Alexander G
AG
D000328:Adult; D001439:Bacteroides / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism / Q000502:physiology; D001644:Bifidobacterium / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism / Q000502:physiology; D003013:Clostridium / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism / Q000502:physiology; D015169:Colony Count, Microbial; D016172:DNA Fingerprinting; D004269:DNA, Bacterial / Q000235:genetics / Q000302:isolation & purification; D014676:Diet, Vegetarian; D004586:Electrophoresis; D005243:Feces / Q000382:microbiology*; D014644:Genetic Variation; D006801:Humans; D016133:Polymerase Chain Reaction; D025341:Principal Component Analysis; D012336:RNA, Ribosomal, 16S / Q000235:genetics / Q000378:metabolism; D011795:Surveys and Questionnaires; D055815:Young Adult
D004269:DNA, Bacterial; D012336:RNA, Ribosomal, 16S