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Appl. Environ. Microbiol., Nov 1996, 4049-4059, Vol 62, No. 11
JP Gray and RP Herwig
For the phylogenetic analysis of microbial communities present in
environmental samples microbial DNA can be extracted from the sample, 16S
rDNA can be amplified with suitable primers and the PCR, and clonal
libraries can be constructed. We report a protocol that can be used for
efficient cell lysis and recovery of DNA from marine sediments. Key steps
in this procedure include the use of a bead mill homogenizer for matrix
disruption and uniform cell lysis and then purification of the released DNA
by agarose gel electrophoresis. For sediments collected from two sites in
Puget Sound, over 96% of the cells present were lysed. Our method yields
high-molecular-weight DNA that is suitable for molecular studies, including
amplification of 16S rRNA genes. The DNA yield was 47 micrograms per g (dry
weight) for sediments collected from creosote-contaminated Eagle Harbor,
Wash. Primers were selected for the PCR amplification of (eu)bacterial 16S
rDNA that contained linkers with unique 8-base restriction sites for
directional cloning. Examination of 22 16S rDNA clones showed that the
surficial sediments in Eagle Harbor contained a phylogenetically diverse
population of organisms from the Bacteria domain (G. J. Olsen, C. R. Woese,
and R. Overbeek, J. Bacteriol. 176:1-6, 1994) with members of six major
lineages represented: alpha, delta, and gamma Proteobacteria; the
gram-positive high G+C content subdivision; clostridia and related
organisms; and planctomyces and related organisms. None of the clones were
identical to any representatives in the Ribosomal Database Project small
subunit RNA database. The analysis of clonal representives in the first
report using molecular techniques to determine the phylogenetic composition
of the (eu)bacterial community present in coastal marine sediments.
Copyright © 1996, American Society for Microbiology
Phylogenetic analysis of the bacterial communities in marine sediments
School of Fisheries, College of Ocean and Fishery Sciences, University of Washington, Seattle 98105-6715, USA.
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