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. 2009 Feb;106(2):506-14.
doi: 10.1111/j.1365-2672.2008.04018.x.

Quantitative strain-specific detection of Lactobacillus rhamnosus GG in human faecal samples by real-time PCR

T Ahlroos  1 , S Tynkkynen
Affiliations

Quantitative strain-specific detection of Lactobacillus rhamnosus GG in human faecal samples by real-time PCR

T Ahlroos et al. J Appl Microbiol. 2009 Feb.

Abstract

Aims: To develop a strain-specific rapid assay for identification and quantification of Lactobacillus rhamnosus GG in human faecal samples.

Methods and results: A unique random amplified polymorphic DNA (RAPD) band of the L. rhamnosus GG strain was isolated and sequenced. Strain-specific polymerase chain reaction (PCR) primers and probes were designed based on the sequence. Quantification was performed by the real-time PCR using a fluorescent resonance energy transfer (FRET) system. The specificity of the assay was tested with DNA isolated from a set of known strains and human faecal samples. The analytical sensitivity of the method for L. rhamnosus GG was about 10 CFU per assay, which corresponds to 10(5) CFU g(-1) of wet faeces.

Conclusions: Quantitative real-time PCR is a suitable method for strain-specific identification of L. rhamnosus GG in human faecal samples.

Significance and impact of the study: Lactobacillus rhamnosus GG is one of the most studied probiotic strains in clinical trials but still lacks a DNA-based identification method. This study describes a real-time PCR method for strain-specific identification and quantification of L. rhamnosus GG in human faecal samples.

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