New triplex real-time PCR assay for detection of Mycobacterium avium subsp. paratuberculosis in bovine feces.

Abstract

In the present study, a robust TaqMan real-time PCR amplifying the F57 and the ISMav2 sequences of Mycobacterium avium subsp. paratuberculosis from bovine fecal samples was developed and validated. The validation was based on the recommendations of International Organization for Standardization protocols for PCR and real-time PCR methods. For specificity testing, 205 bacterial strains were selected, including 105 M. avium subsp. paratuberculosis strains of bovine, ovine, and human origin and 100 non-M. avium subsp. paratuberculosis strains. Diagnostic quality assurance was obtained by use of an internal amplification control. By investigating six TaqMan reagents from different suppliers, the 100% detection probability was assessed to be 0.1 picogram M. avium subsp. paratuberculosis DNA per PCR. The amplification efficiency was 98.2% for the single-copy gene F57 and 97.8% for the three-copy insertion sequence ISMav2. The analytical method was not limited due to instrument specificity. The triplex real-time PCR allowed the reliable detection of M. avium subsp. paratuberculosis DNA using the ABI Prism 7000 sequence detection system, and the LightCycler 1.0. TaqMan(mgb) and locked nucleic acid fluorogenic probes were suitable for fluorescent signal detection. To improve the detection of M. avium subsp. paratuberculosis from bovine fecal samples, a more efficient DNA extraction method was developed, which offers the potential for automated sample processing. The 70% limit of detection was assessed to be 10(2) CFU per gram of spiked bovine feces. Comparative analysis of 108 naturally contaminated samples of unknown M. avium subsp. paratuberculosis status resulted in a relative accuracy of 98.9% and a sensitivity of 94.4% for fecal samples containing <10 CFU/g feces compared to the traditional culture method.

DOI: 10.1128/AEM.02534-07
0100200300200920102011201220132014201520162017
Citations per Year

738 Citations

Semantic Scholar estimates that this publication has 738 citations based on the available data.

See our FAQ for additional information.

Cite this paper

@article{Schnenbrcher2008NewTR, title={New triplex real-time PCR assay for detection of Mycobacterium avium subsp. paratuberculosis in bovine feces.}, author={Holger Sch{\"{o}nenbr{\"{u}cher and Amir Abdulmawjood and Klaus Failing and Michael B{\"{u}lte}, journal={Applied and environmental microbiology}, year={2008}, volume={74 9}, pages={2751-8} }