Accession Number : ADA429738


Title :   Real-Time PCR Assay for a Unique Chromosomal Sequence of Bacillus anthracis


Corporate Author : ARMY MEDICAL RESEARCH INST OF INFECTIOUS DISEASES FORT DETRICK MD


Personal Author(s) : Bode, Elizabeth ; Hurtle, William ; Norwood, David


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a429738.pdf


Report Date : Dec 2004


Pagination or Media Count : 8


Abstract : Real-time PCR has become an important method for the rapid identification of Bacillus anthracis since the 2001 anthrax mailings. Most real-time PCR assays for B. anthracis have been developed to detect virulence genes located on the pXO1 and pXO2 plasmids. In contrast, only two published chromosomal targets exist, the rpoB gene and the gyrA gene. In the present study, subtraction-hybridization with a plasmid-cured B. anthracis tester strain and a Bacillus cereus driver was used to find a unique chromosomal sequence. By targeting this region, a real-time assay was developed with the Ruggedized Advanced Pathogen Identification Device. Further testing has revealed that the assay has 100% sensitivity and 100% specificity, with a limit of detection of 50 fg of DNA. The results of a search for sequences with homology with the BLAST program demonstrated significant alignment to the recently published B. anthracis Ames strain, while an inquiry for protein sequence similarities indicated homology with an abhydrolase from B. anthracis strain A2012. The importance of this chromosomal assay will be to verify the presence of B. anthracis independently of plasmid occurrence.


Descriptors :   *CHROMOSOMES , *BACILLUS ANTHRACIS , REPRINTS , REAL TIME , PROTEINS , TEST EQUIPMENT , DEOXYRIBONUCLEIC ACIDS , PLASMIDS , STRAINS(BIOLOGY) , TARGETING , GENES , ANTHRAX , VIRULENCE


Subject Categories : Genetic Engineering and Molecular Biology
      Microbiology


Distribution Statement : APPROVED FOR PUBLIC RELEASE