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Updated: May 13, 2026
Microbial DNA Analysis in the Field Using a Biological Extraction Field Kit and a Field qPCR Unit
Published on: January 2, 2026
Quantitative estimation of Dehalococcoides mccartyi at laboratory and field scale: comparative study between
B Matturro1, G L Heavner, R E Richardson
1Water Research Institute, IRSA-CNR, Via Salaria km 29,300, 00015 Monterotondo (RM), Italy.
CAtalyzed Reporter Deposition-Fluorescence In situ Hybridization (CARD-FISH) accurately quantifies Dehalococcoides mccartyi across various concentrations. Quantitative PCR (qPCR) struggles with low concentrations, highlighting the need for confirmatory methods in environmental samples.
Area of Science:
- Environmental microbiology
- Bioremediation science
- Molecular biology techniques
Background:
- Dehalococcoides mccartyi is crucial for assessing bioremediation effectiveness at chlorinated solvent-contaminated sites.
- Accurate quantification of Dehalococcoides is essential for monitoring natural attenuation and engineered bioremediation processes.
- Field detectability of Dehalococcoides informs site remediation strategies.
Purpose of the Study:
- To directly compare the quantitative performance of qPCR and CARD-FISH for Dehalococcoides enumeration.
- To evaluate the accuracy and reproducibility of both methods across a broad range of microbial concentrations.
- To identify the limitations of qPCR, particularly at low Dehalococcoides concentrations, in environmental samples.
Main Methods:
- Quantitative analysis of Dehalococcoides mccartyi using Real Time PCR (qPCR).
- Quantitative enumeration using CAtalyzed Reporter Deposition-Fluorescence In situ Hybridization (CARD-FISH).
- Testing involved serial dilutions of laboratory cultures and analysis of 49 field groundwater samples from six contaminated sites.
Main Results:
- CARD-FISH provided consistent, reproducible, and linear quantification of Dehalococcoides over a wide concentration range (10-10(8) cells mL(-1)).
- qPCR failed to reliably discriminate 16S rRNA gene concentrations below 10(3) gene copies mL(-1) in both laboratory and field samples.
- Significant discrepancies were observed in qPCR results at lower microbial concentrations.
Conclusions:
- CARD-FISH is a reliable method for quantifying Dehalococcoides mccartyi, even at low environmental concentrations.
- qPCR exhibits limitations in sensitivity and accuracy for low-level Dehalococcoides detection in contaminated groundwater.
- Confirmatory methodologies like CARD-FISH are recommended when low Dehalococcoides concentrations are anticipated for accurate bioremediation assessment.
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