title: A universal primer multiplex PCR method for typing of toxinogenic Pseudomonas aeruginosa.
abstract: Pseudomonas aeruginosa is a well-known opportunistic pathogen that can cause acute nosocomial necrotizing pneumonia and genetic disorder cystic fibrosis of lung patients. Pathogenic interactions between P. aeruginosa and hosts are often guided by the secreted virulence determinants that interact with specific host targets. Exotoxin A, pyocyanin, elastase, and type III secretion system are the most significant virulence determinants and cause great concern. However, P. aeruginosa in various environments has high genotypic diversity, leading to deficiency of exotoxin genes for some P. aeruginosa strains. In current study, a universal primer-multiplex PCR method (UP-MPCR) was employed for the detection of five significant enterotoxin genes (toxA, phzM, lasB, ExoU, and ExoS) and one internal control gene ecfX in P. aeruginosa. Owing to the application of universal primer (UP), different targeted products have identical amplified efficiency and the sensitivity of multiplex PCR is improved. In addition, the complexity of multiplex PCR system is reduced and the compatibility of primers in a reaction is greatly increased. This UP-MPCR method can detect the presence of five P. aeruginosa enterotoxin genes in a single assay more rapidly and sensitively than conventional methods. In 214 drinking water and environmental isolates, the ExoU, ExoS, phzM, toxA, and lasB genes were detected in 20 (9 %), 180 (84 %), 179 (84 %), 196 (92 %), and 171 (80 %) isolates, respectively.
authors.affiliation: College of Food Science and Nutritional Engineering, China Agricultural University, No. 17 Tsinghua Donglu, Beijing 100083, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Shi
authors.forename: Quoclinh
authors.initials: Q
authors.lastname: Trinh
authors.forename: Wentao
authors.initials: W
authors.lastname: Xu
authors.forename: Baiqiang
authors.initials: B
authors.lastname: Zhai
authors.forename: Yunbo
authors.initials: Y
authors.lastname: Luo
authors.forename: Kunlun
authors.initials: K
authors.lastname: Huang
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics* / Q000378:metabolism; D015373:Bacterial Typing Techniques / Q000379:methods*; D017931:DNA Primers / Q000235:genetics*; D060766:Drinking Water / Q000382:microbiology*; D004783:Environmental Microbiology; D005098:Exotoxins / Q000235:genetics* / Q000378:metabolism; D060885:Multiplex Polymerase Chain Reaction / Q000379:methods*; D011550:Pseudomonas aeruginosa / Q000145:classification / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism
chemical_list: D001426:Bacterial Proteins; D017931:DNA Primers; D060766:Drinking Water; D005098:Exotoxins