Selective detection of viable Helicobacter pylori using ethidium monoazide or propidium monoazide in combination with real-time polymerase chain reaction |
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학술지명 Microbiology and Immunology
저자 이규철,남세희,김민정,권순복,맹필재,박종근
발표일 2011-12-26
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Since Helicobacter pylori has a role in the pathogenesis of gastric cancer, chronic gastritis, and peptic ulcer disease, detection of its viable form is very important. The objective of this study was to optimize a real-time polymerase chain reaction (PCR) method using ethidium monoazide (EMA) or propidium monoazide (PMA) for selective detection of viable H. pylori cells in mixed samples of viable and dead bacteria. Before conducting the real-time PCR using SodB primers of H. pylori, EMA or PMA was added to the suspensions of viable and/or dead H. pylori cells at concentrations between 1 and 100 μM. PMA at a concentration of 50 μM induced the highest DNA loss in dead cells with only little loss of genomic DNA in viable cells. In addition, selective detection of viable cells in the mixtures of viable and dead cells at various ratios was possible with the combined use of PMA and real-time PCR. In contrast, EMA penetrated the membranes of both viable and dead cells and induced the degradation of their genomic DNA. Findings of this study suggest that PMA can be used effectively for the differentiation of viable H. pylori from its dead form, but EMA cannot. |