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Quantitative PCR targeting 16S rRNA and reductive dehalogenase genes simultaneously monitors multiple Dehalococcoides
Kirsti M Ritalahti1, Benjamin K Amos, Youlboong Sung
1Georgia Institute of Technology, School of Civil and Environmental Engineering, 311 Ferst Drive, 3230 ES&T Building, Atlanta, GA 30332-0512, USA. krita@ce.gatech.edu
Applied and Environmental Microbiology
|April 7, 2006
Summary
Quantitative PCR (qPCR) targeting reductive dehalogenase (RDase) genes offers improved monitoring of Dehalococcoides in bioremediation. Many Dehalococcoides species possess uncharacterized RDase genes, revealing gaps in our understanding of their function.
Area of Science:
- Environmental microbiology
- Molecular biology
- Bioremediation
Background:
- The 16S rRNA gene offers limited insight into the diversity of chloroorganic electron acceptors utilized by Dehalococcoides.
- Accurate quantification of Dehalococcoides is crucial for assessing bioremediation effectiveness and site contamination levels.
Purpose of the Study:
- To develop and validate a quantitative real-time PCR (qPCR) method for quantifying Dehalococcoides organisms.
- To target specific reductive dehalogenase (RDase) genes (tceA, bvcA, vcrA) for enhanced diagnostic capabilities.
Main Methods:
- Designed and evaluated a qPCR approach targeting 16S rRNA genes and three functional RDase genes (tceA, bvcA, vcrA).
- Generated qPCR standard curves using Dehalococcoides pure cultures and applied the method to enrichment cultures, microcosms, and contaminated site samples.
Main Results:
- qPCR standard curves for RDase genes correlated well with those for 16S rRNA genes, indicating RDase genes are suitable quantitative targets.
- The qPCR method demonstrated high specificity and sensitivity for detecting and quantifying tceA, bvcA, and vcrA genes.
- In site samples and chloroethane-dechlorinating microcosms, the sum of detected RDase genes represented only 10-30% of the total Dehalococcoides population.
Conclusions:
- The developed qPCR method provides enhanced tools for Dehalococcoides growth measurements, site assessment, and bioremediation monitoring.
- A significant portion of Dehalococcoides populations in environmental samples possess unidentified RDase genes, highlighting incomplete knowledge of their metabolic capabilities.