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Applied and Environmental Microbiology, August 2005, p. 4214-4219, Vol. 71, No. 8
0099-2240/05/$08.00+0 doi:10.1128/AEM.71.8.4214-4219.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
Development and Assessment of a Real-Time PCR Assay for Rapid and Sensitive Detection of a Novel Thermotolerant Bacterium, Lactobacillus thermotolerans, in Chicken Feces
Abu Sadeque Md. Selim,1 Piyanuch Boonkumklao,3 Teruo Sone,1 Apinya Assavanig,4 Masaru Wada,2 and Atsushi Yokota2*Laboratory of Applied Microbiology, Graduate School of Agriculture, Hokkaido University, Kita-9 Nishi-9, Kita-ku, Sapporo 060-8589, Japan,1 Laboratory of Microbial Resources and Ecology, Graduate School of Agriculture, Hokkaido University, Kita-9 Nishi-9, Kita-ku, Sapporo 060-8589, Japan,2 Department of Biology, Faculty of Science, Maejo University, Sansai, Chiang Mai 50290, Thailand,3 Department of Biotechnology, Faculty of Science, Mahidol University, Rama 6 Road, Bangkok 10400, Thailand4
Received 24 September 2004/ Accepted 25 February 2005
A new real-time PCR assay was successfully developed using a TaqMan fluorescence probe for specific detection and enumeration of a novel bacterium, Lactobacillus thermotolerans, in chicken feces. The specific primers and probe were designed based on the L. thermotolerans 16S rRNA gene sequences, and these sequences were compared to those of all available 16S rRNA genes in the GenBank database. The assay, targeting 16S rRNA gene, was evaluated using DNA from a pure culture of L. thermotolerans, DNA from the closely related bacteria Lactobacillus mucosae DSM 13345T and Lactobacillus fermentum JCM 1173T, and DNA from other lactic acid bacteria in quantitative experiments. Serial dilutions of L. thermotolerans DNA were used as external standards for calibration. The minimum detection limit of this technique was 1.84 x 103 cells/ml of an L. thermotolerans pure culture. The assay was then applied to chicken feces in two different trials. In the first trial, the cell population was 104 cells/g feces on day 4 and 105 cells/g feces on days 11 to 18. However, cell populations of 106 to 107 cells/g feces were detected in the second trial. The total bacterial count, measured by 4',6-diamidino-2-phenylindole (DAPI) staining, was approximately 1011 cells/g feces. These results suggest that in general, L. thermotolerans is a normal member of the chicken gut microbiota, although it is present at relatively low levels in the feces.
* Corresponding author. Mailing address: Laboratory of Microbial Resources and Ecology, Graduate School of Agriculture, Hokkaido University, Kita-9 Nishi-9, Kita-ku, Sapporo 060-8589, Japan. Phone: 81 11 706 2501. Fax: 81 11 706 4961. E-mail: yokota{at}chem.agr.hokudai.ac.jp.
Applied and Environmental Microbiology, August 2005, p. 4214-4219, Vol. 71, No. 8
0099-2240/05/$08.00+0 doi:10.1128/AEM.71.8.4214-4219.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
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