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Quantitative Detection Of Selenate-reducing Bacteria By Real-time PCR Targeting The Selenate Reductase Gene.

Li-lian Wen, Chun-Yu Lai, Q. Yang, Jiaxian Chen, Yin Zhang, A. Ontiveros-Valencia, He-Ping Zhao
Published 2016 · Biology, Medicine

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We designed a primer set to target selenate reductase (SerA) for detecting selenate reducing bacteria (SeRB). Our serA gene-based PCR primer set has high specificity in that it and positively amplified some SeRB, but not denitrifying bacteria (DB). Phylogenetic analysis of serA clone sequences of environmental samples from selenate-reducing membrane biofilm reactor (MBfR) biofilms showed that these sequences were closely grouped and had high similarity to selenate reductase gene sequences from SeRB Thauera selenatis and DB Dechloromonas; however, they were distant to other genes from dimethylsulfoxide (DMSO) enzyme family. Constructing a standard curve targeting the serA gene, we found that the good linearity for the qPCR assay when applied it to quantify SeRB in MBfR biofilms, and the gene copies of SeRB correlated well to the selenate removal percentages. Our results demonstrated the feasibility of using the serA gene-based PCR primer set to detect and quantify SeRB in environmental samples.
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