Skip to Main content Skip to Navigation
Journal articles

Proposal of a quantitative PCR-based protocol for an optimal Pseudomonas aeruginosa detection in patients with cystic fibrosis

Abstract : Background
The lung of patients with cystic fibrosis (CF) is particularly sensitive to Pseudomonas aeruginosa. This bacterium plays an important role in the poor outcome of CF patients. During the disease progress, first acquisition of P. aeruginosa is the key-step in the management of CF patients. Quantitative PCR (qPCR) offers an opportunity to detect earlier the first acquisition of P. aeruginosa by CF patients. Given the lack of a validated protocol, our goal was to find an optimal molecular protocol for detection of P. aeruginosa in CF patients.
Methods
We compared two formerly described qPCR formats in early detection of P. aeruginosa in CF sputum samples: a qPCR targeting oprL gene, and a multiplex PCR targeting gyrB and ecfX genes.
Results
Tested in vitro on a large panel of P. aeruginosa isolates and others gram-negative bacilli, oprL qPCR exhibited a better sensitivity (threshold of 10 CFU/mL versus 730 CFU/mL), whereas the gyrB/ecfX qPCR exhibited a better specificity (90% versus 73%). These results were validated ex vivo on 46 CF sputum samples positive for P. aeruginosa in culture. Ex vivo assays revealed that qPCR detected 100 times more bacterial cells than culture-based method did.
Conclusion
Based on these results, we proposed a reference molecular protocol combining the two qPCRs, which offers a sensitivity of 100% with a threshold of 10 CFU/mL and a specificity of 100%. This combined qPCR-based protocol can be adapted and used for other future prospective studies.
Document type :
Journal articles
Complete list of metadatas

Cited literature [42 references]  Display  Hide  Download

https://www.hal.inserm.fr/inserm-00837789
Contributor : Ed. Bmc <>
Submitted on : Monday, June 24, 2013 - 1:05:33 PM
Last modification on : Thursday, November 29, 2018 - 4:08:49 PM
Long-term archiving on: : Wednesday, September 25, 2013 - 4:09:39 AM

Files

Identifiers

  • HAL Id : inserm-00837789, version 1

Collections

Citation

Florence Le Gall, Rozenn Le Berre, Sylvain Rosec, Jeanne Hardy, Stéphanie Gouriou, et al.. Proposal of a quantitative PCR-based protocol for an optimal Pseudomonas aeruginosa detection in patients with cystic fibrosis. BMC Microbiology, BioMed Central, 2013, 13 (1), pp.143. ⟨inserm-00837789⟩

Share

Metrics

Record views

926

Files downloads

659