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Appl. Environ. Microbiol., Sep 1996, 3112-3120, Vol 62, No. 9
DH Lee, YG Zo and SJ Kim
We describe a new method for studying the structure and diversity of
bacterial communities in the natural ecosystem. Our approach is based on
single-strand-conformation polymorphism (SSCP) analysis of PCR products of
16S rRNA genes from complex bacterial populations. A pair of eubacterial
universal primers for amplification of the variable V3 region were designed
from the 16S rRNA sequences of 1,262 bacterial strains. The PCR conditions
were optimized by using genomic DNAs from five gram-positive and seven
gram-negative strains. The SSCP analysis of the PCR products demonstrated
that a bacterial strain generated its characteristic band pattern and that
other strains generated other band patterns, so that the relative diversity
in bacterial communities could be measured. In addition, this method was
sensitive enough to detect a bacterial population that made up less than
1.5% of a bacterial community. The distinctive differences between
bacterial populations were observed in an oligotrophic lake and a eutrophic
pond in a field study. The method presented here, using combined PCR
amplification and SSCP pattern analyses of 16S rRNA genes, provides a
useful tool to study bacterial community structures in various ecosystems.
Copyright © 1996, American Society for Microbiology
Nonradioactive method to study genetic profiles of natural bacterial communities by PCR-single-strand-conformation polymorphism
Department of Microbiology, College of Natural Sciences, Seoul National University, Korea.
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