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Appl. Environ. Microbiol., Feb 1995, 763-768, Vol 61, No. 2
A Ogram, W Sun, FJ Brockman and JK Fredrickson
Three methods for the isolation of microbial RNA from low-biomass deep-
subsurface sediments have been developed and evaluated. RNA was isolated
from samples taken from depths ranging from 173 to 217 m, and samples
represented a variety of lithologies, including lacustrine, fluvial sand,
and paleosol sediments. Cell numbers in these samples were estimated to be
between log 4.0 and log 5.1/g on the basis of phospholipid fatty acid
analysis. The most efficient method examined is based on the direct lysis
of microbial cells followed by the extraction of RNA with alkaline
phosphate buffers and subsequent inactivation of nucleases by extraction
with guanidinium isothiocyanate. Estimated recoveries of mRNA for this
method are approximately 26%. The recovered RNA included both mRNA and
rRNA, as evidenced by the detection of sequences homologous to transcripts
from the toluene-4-monooxygenase gene of Pseudomonas mendocina KR1 and
bacterial, archaeal, and eukaryotic rRNA. An unexpectedly high relative
concentration of archaeal rRNA (22 to 40%) was observed for these samples.
Copyright © 1995, American Society for Microbiology
Isolation and characterization of RNA from low-biomass deep-subsurface sediments
Department of Crop and Soil Sciences, Washington State University, Pullman 99164-6420, USA.
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