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Appl. Environ. Microbiol., Jul 1995, 2798-2801, Vol 61, No. 7
V Farrelly, FA Rainey and E Stackebrandt
In order to assess the effect of genome size and number of 16S rRNA genes
(rDNAs) on the quantities of PCR-generated partial 16S rDNA fragments,
equimolar amounts of DNA from pairs of different species for which these
parameters are known were subjected to gene amplification. The
experimentally determined ratio of PCR products obtained, as determined by
image analysis of SYBR-Green I-stained amplification products, corresponded
well with the predicted ratio calculated from the number of rrn genes per
equimolar amounts of DNA in mixtures of Escherichia coli and "Thermus
thermophilus" and of Pseudomonas aeruginosa and "T. thermophilus." The
values for the pair of Bacillus subtilis and "T. thermophilus" showed
greater deviations from the predicted value. The dependence of the amount
of 16S rDNA amplification product on these two parameters makes it
impossible to quantify the number of species represented in 16S rDNA clone
libraries of environmental samples as long as these two parameters are
unknown for the species present.
Copyright © 1995, American Society for Microbiology
Effect of genome size and rrn gene copy number on PCR amplification of 16S rRNA genes from a mixture of bacterial species
DSM-German Collection of Microorganisms and Cell Cultures GmbH, Braunschweig.
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