title: Chloroethene degradation and expression of Dehalococcoides dehalogenase genes in cultures originating from Yangtze sediments.
abstract: The anaerobic Dehalococcoides spp. is the only microorganism known to completely dechlorinate the hazardous compounds tetrachloroethene (PCE) or trichloroethene (TCE) via dichloroethene (DCE) and vinyl chloride (VC) to the terminal product, ethene. In this study, growth of Dehalococcoides spp. (DHC) and the expression of DHC dehalogenase genes were demonstrated for Yangtze enrichment cultures. Reductive dechlorination of chloroethenes occurred in Yangtze sediment without the addition of any external auxiliary substrates. All Yangtze enrichment cultures completely dechlorinated PCE and cis-DCE to ethene. To investigate expression of the dehalogenase genes pceA, tceA, vcrA, and bvcA, a protocol for messenger RNA (mRNA) extraction followed by reverse transcription and quantitative PCR analysis was established. During dechlorination, an increase in gene copy numbers of pceA, tceA, and vcrA was observed. However, temporary formation of mRNA was only measured in the case of the dehalogenase genes tceA and vcrA. Comparison of DHC dehalogenase patterns indicated that the Yangtze DHC community does not match any of the previously published enrichment cultures that were obtained from contaminated areas in the USA or Europe.
authors.affiliation: Department of Environmental Biotechnology, DVGW-Technologiezentrum Wasser (TZW), Karlsruher Straße 84, 76139, Karlsruhe, Germany.
authors.forename: Irene
authors.initials: I
authors.lastname: Kranzioch
authors.forename: Selina
authors.initials: S
authors.lastname: Ganz
authors.forename: Andreas
authors.initials: A
authors.lastname: Tiehm
mesh_terms: D001673:Biodegradation, Environmental; D018929:Cell Culture Techniques; D002681:China; D041862:Chloroflexi / Q000201:enzymology / Q000235:genetics* / Q000254:growth & development; D005030:Ethylenes / Q000378:metabolism; D018628:Gene Dosage / Q000235:genetics; D015964:Gene Expression Regulation, Bacterial; D015971:Gene Expression Regulation, Enzymologic; D005798:Genes, Bacterial; D019015:Geologic Sediments / Q000737:chemistry / Q000382:microbiology; D010088:Oxidoreductases / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D045483:Rivers / Q000382:microbiology; D013750:Tetrachloroethylene / Q000378:metabolism*; D014241:Trichloroethylene / Q000378:metabolism*; D014752:Vinyl Chloride / Q000378:metabolism*
chemical_list: D005030:Ethylenes; D014241:Trichloroethylene; C036216:ethylene; D010088:Oxidoreductases; C112990:tetrachloroethene dehalogenase; D013750:Tetrachloroethylene; D014752:Vinyl Chloride