A conceptual model linking functional gene expression and reductive dechlorination rates of chlorinated ethenes in clay rich groundwater sediment

Jacob Bælum, Julie C. Chambon, Charlotte Scheutz, Philip J. Binning, Troels Laier, Poul L. Bjerg, Carsten S. Jacobsen

Research output: Contribution to journalArticleResearchpeer-review

23 Citations (Scopus)

Abstract

We used current knowledge of cellular processes involved in reductive dechlorination to develop a conceptual model to describe the regulatory system of dechlorination at the cell level; the model links bacterial growth and substrate consumption to the abundance of messenger RNA of functional genes involved in the dechlorination process. The applicability of the model was tested on a treatability study of biostimulated and bioaugmented microcosms. Using quantitative real time PCR, high-resolution expression profiles of the functional reductive dehalogenase genes bvcA and vcrA were obtained during two consecutive dechlorination events of trichlorethene, cis-dichlorethene and vinyl chloride. Up-regulation of the bvcA (for the biostimulated microcosms) and vcrA (for the bioaugmented microcosms) gene expression fitted well with high rates of dechlorination of vinyl chloride, while no known transcripts could be measured during trichloroethene and cis-dichlorethene dechlorination. Maximum concentrations of 2.1 and 1.7 transcripts per gene of the bvcA and vcrA genes, respectively, were measured at the same time points as maximum dechlorination rates were observed. The developed model compared well with the experimental data for both biostimulated and bioaugmented microcosms under non-steady state conditions and was supported by results from a recently published study under steady state conditions.

Original languageEnglish
Pages (from-to)2467-2478
Number of pages12
JournalWater Research
Volume47
Issue number7
DOIs
Publication statusPublished - 1 May 2013

Keywords

  • Conceptual model
  • Dechlorination genes
  • Dehalococcoides spp.
  • Molecular microbial ecology
  • MRNA extraction from clay rich soil
  • Quantitative PCR

Programme Area

  • Programme Area 2: Water Resources

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