GeneCARD-FISH: detection of tceA and vcrA reductive dehalogenase genes in Dehalococcoides mccartyi by fluorescence in situ hybridization.

作者: B. Matturro , S. Rossetti

DOI: 10.1016/J.MIMET.2015.01.005

关键词:

摘要: Due to the direct involvement in biodegradation of chlorinated solvents, reductive dehalogenase genes (RDase) are considered biomarkers metabolic potential different strains Dehalococcoides mccartyi (Dhc). This is known be only microbe able completely reduce toxic solvents harmless ethene. In last years, several Molecular Biological Tools (MBTs) have been developed optimize detectability Dhc cells and/or RDase genes, with particular attention most important indicators ethene formation, namely tceA and vcrA genes. Despite qPCR has indicated as MBT choice, use CARD-FISH recently demonstrated provide a more accurate quantification wide concentration range, overcoming drawbacks loosing nucleic acids during preparation sample associated qPCR. assays usually target 16S rRNA up date no protocol discriminate by detecting developed. study reports first evidence situ detection into applying new procedure named geneCARD-FISH. carrying were identified quantified PCE-to-ethene dechlorinating microbial enrichment overall they represented 58.63%±2.45% 40.46%±1.86% total cells, respectively. These values markedly higher than those obtained qPCR, which strongly underestimated actual gene (0.08%±0.01% copies). The assay was successfully applied also for analysis environmental samples remarkably strengthens biomonitoring activities at field scale providing specific discrimination key-RDase

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