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. 1992 Sep;30(9):2295–2301. doi: 10.1128/jcm.30.9.2295-2301.1992

Reverse transcription and polymerase chain reaction amplification of rRNA for detection of Helicobacter species.

L Engstrand 1, A M Nguyen 1, D Y Graham 1, F A el-Zaatari 1
PMCID: PMC265495  PMID: 1383268

Abstract

Sequence data on Helicobacter pylori 16S rRNA were used to select two 22-base oligonucleotide primers for use in a polymerase chain reaction (PCR) for detection of H. pylori. H. pylori cells were treated with lysis buffer, boiled, and chloroform extracted. Reverse transcription of rRNA was followed by PCR amplification (RT-PCR) of the synthesized cDNA and 16S rRNA gene. The amplified PCR products were analyzed by agarose gel electrophoresis and Southern blotting. Using ethidium bromide-stained agarose gels, we were able to detect the expected 500-bp DNA fragment from as few as two H. pylori organisms per reaction. The specificity of the RT-PCR assay was tested with 27 clinical isolates and related reference strains; although the number of bacterial cells used per reaction was 10(5)-fold greater than the number of H. pylori organisms used, amplification was detected only with bacteria in the same genus, H. cinaedi and H. mustelae. Ten H. pylori organisms per biopsy specimen were detected on agarose gels when organisms were added to samples prepared from a processed colon biopsy sample. RT-PCR results were consistent with urea breath test and culture results in 14 of 15 gastric biopsy specimens; the specificity was 100%. RT-PCR of rRNA from H. pylori increased the sensitivity of pathogen detection at least 25- to 50-fold compared with that of previous PCR assays. This low level of detection by RT-PCR assay may prove to be well suited for verifying eradication following therapy.

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