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Identification and characterization of Bacillus anthracis by multiplex PCR on DNA chip
Authors:Wang Shi-Hua  Wen Ji-Kai  Zhou Ya-Feng  Zhang Zhi-Ping  Yang Rui-Fu  Zhang Ji-Bin  Chen Jia  Zhang Xian-En
Institution:Department of Analytical Biochemistry, Biotech Wuchang, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan 430071, China.
Abstract:Bacillus anthracis can be identified by detecting virulence factor genes located on two plasmids, pXO1 and pXO2. Combining multiplex PCR with arrayed anchored primer PCR and biotin-avidin alkaline phosphatase indicator system, we developed a qualitative DNA chip method for characterization of B. anthracis, and simultaneous confirmation of the species identity independent of plasmid contents. The assay amplifies pag gene (in pXO1), cap gene (in pXO2) and Ba813 gene (a B. anthracis specific chromosomal marker), and the results were indicated by an easy-to-read profile based on the color reaction of alkaline phosphatase. About 1 pg of specific DNA fragments on the chip wells could be detected after PCR. With the proposed method, the avirulent (pXO1+/2-, pXO1-/2+ and pXO1-/2-) strains of B. anthracis and distinguished 'anthrax-like' strains from other B. cereus group bacteria were unambiguously identified, while the genera other than Bacillus gave no positive signal.
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