Development of an F57 sequence-based real-time PCR assay for detection of Mycobacterium avium subsp. paratuberculosis in milk.

Abstract:

:A light cycler-based real-time PCR (LC-PCR) assay that amplifies the F57 sequence of Mycobacterium avium subsp. paratuberculosis was developed. This assay also includes an internal amplification control template to monitor the amplification conditions in each reaction. The targeted F57 sequence element is unique for M.avium subsp. paratuberculosis and is not known to exist in any other bacterial species. The assay specificity was demonstrated by evaluation of 10 known M. avium subsp. paratuberculosis isolates and 33 other bacterial strains. The LC-PCR assay has a broad linear range (2 x 10(1) to 2 x10(6) copies) for quantitative estimation of the number of M. avium subsp. paratuberculosis F57 target copies in positive samples. To maximize the assay's detection sensitivity, an efficient strategy for isolation of M. avium subsp. paratuberculosis DNA from spiked milk samples was also developed. The integrated procedure combining optimal M. avium subsp. paratuberculosis DNA isolation and real-time PCR detection had a reproducible detection limit of about 10 M. avium subsp. paratuberculosis cells per ml when a starting sample volume of 10 ml of M. avium subsp. paratuberculosis-spiked milk was analyzed. The entire process can be completed within a single working day and is suitable for routine monitoring of milk samples for M. avium subsp. paratuberculosis contamination. The applicability of this protocol for naturally contaminated milk was also demonstrated using milk samples from symptomatic M. avium subsp. paratuberculosis-infected cows, as well as pooled samples from a dairy herd with a confirmed history of paratuberculosis.

journal_name

Appl Environ Microbiol

authors

Tasara T,Stephan R

doi

10.1128/AEM.71.10.5957-5968.2005

keywords:

subject

Has Abstract

pub_date

2005-10-01 00:00:00

pages

5957-68

issue

10

eissn

0099-2240

issn

1098-5336

pii

71/10/5957

journal_volume

71

pub_type

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