Decontamination of polymerase chain reaction reagents for detection of low concentrations of 16S rRNA genes
- 177 Downloads
We describe a polymerase chain reaction (PCR) that allowed detection of rRNA consensus sequences from the DNA extracted from a wide range of bacterial species in amounts as low as 10 fg. To avoid false-positive results with universal primers for 16S rRNA PCR, contaminating DNA had to be eliminated from the polymerase preparations. Decontamination was undertaken before PCR to optimize treatment with DNase I and was followed by DNase inactivation at 94°C for 50 min, which eliminated contaminating DNA at concentrations of up to 100 pg. After optimization of PCR conditions for each polymerase, Deep-Vent Exo-®polymerase (New England Biolabs, Beverly, MA), and super-Taq® polymerase (HT Biotechnology, Cambridge, UK) were more effective than Ampli-Taq® polymerase (Perkin-Elmer Cetus, Norwalk, CT), Ampli-Taq LD® polymerase (Perkin-Elmer Cetus) or Deep-vent® polymerase (New England Biolabs). The technique described in this article might prove to be a universal method for PCR detection of small numbers of unidentified bacteria in usually sterile clinical sites, such as blood and cerebrospinal fluids, in which a broad spectrum of pathogens can be expected.
Index EntriesPCR polymerase DNase 16S rRNA sequences bacteria
Unable to display preview. Download preview PDF.
- 16.Sahn, D. F., Kissinger, J., Gilmore, M. S., Murray, P. R., Mulder, R., Solliday, J., and Clarke, B. (1989) In vitro susceptibility studies of vancomycin-resistantEnterococcus faecalis.Antimicrob. Agents Chemother. 33, 1588–1591.Google Scholar
- 24.Erlich, H. A. (ed.) (1989)PCR Technology, Principles and Applications for DNA amplification. Stockton, England.Google Scholar