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Appl. Environ. Microbiol., Nov 1997, 4516-4522, Vol 63, No. 11
WT Liu, TL Marsh, H Cheng and LJ Forney
A quantitative molecular technique was developed for rapid analysis of
microbial community diversity in various environments. The technique
employed PCR in which one of the two primers used was fluorescently labeled
at the 5' end and was used to amplify a selected region of bacterial genes
encoding 16S rRNA from total community DNA. The PCR product was digested
with restriction enzymes, and the fluorescently labeled terminal
restriction fragment was precisely measured by using an automated DNA
sequencer. Computer-simulated analysis of terminal restriction fragment
length polymorphisms (T-RFLP) for 1,002 eubacterial sequences showed that
with proper selection of PCR primers and restriction enzymes, 686 sequences
could be PCR amplified and classified into 233 unique terminal restriction
fragment lengths or "ribotypes." Using T-RFLP, we were able to distinguish
all bacterial strains in a model bacterial community, and the pattern was
consistent with the predicted outcome. Analysis of complex bacterial
communities with T-RFLP revealed high species diversity in activated
sludge, bioreactor sludge, aquifer sand, and termite guts; as many as 72
unique ribotypes were found in these communities, with 36 ribotypes
observed in the termite guts. The community T-RFLP patterns were
numerically analyzed and hierarchically clustered. The pattern derived from
termite guts was found to be distinctly different from the patterns derived
from the other three communities. Overall, our results demonstrated that
T-RFLP is a powerful tool for assessing the diversity of complex bacterial
communities and for rapidly comparing the community structure and diversity
of different ecosystems.
Copyright © 1997, American Society for Microbiology
Characterization of microbial diversity by determining terminal restriction fragment length polymorphisms of genes encoding 16S rRNA
Department of Microbiology, Michigan State University, East Lansing 48824, USA.
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