title: Improved PCR for identification of Pseudomonas aeruginosa.
abstract: The aim of the present study was to develop a noble and specific marker for a quantitative polymerase chain reaction (PCR) assay for the species-specific detection of Pseudomonas aeruginosa based on the O-antigen acetylase gene. It is an important challenge to characterize populations of the bacterium P. aeruginosa, an opportunist by virtue of its physiological and genetic adaptability. However, molecular and serological methods currently available for sensitive and specific detection of P. aeruginosa are by no means satisfactory because there have been critical defects in the diagnosis and identification of P. aeruginosa strains in that these assays also detect other Pseudomonas species, or do not obtain amplified products from P. aeruginosa strains. Therefore, a primer set was designed based on the O-antigen acetylase gene of P. aeruginosa PA01 because it has been known that this gene is structurally diverse among species. The specificity of the primer set was evaluated using genomic DNA from six isolates of P. aeruginosa, 18 different species of Pseudomonas, and 23 other reference pathogenic bacteria. The primer set used in the PCR assay amplified a 232-bp amplicon for only six P. aeruginosa strains. The assay was also able to detect at least 1.41 × 10(3) copies/μl of cloned amplified target DNA using purified DNA, or 2.7 × 10(2) colony-forming unit per reaction when using calibrated cell suspension. In conclusion, this assay can be applied as a practical diagnostic method for epidemiological research and the sanitary management of water with a low level or latent infection of P. aeruginosa.
authors.affiliation: National Academy of Agricultural Science, Rural Development Administration, 441-707 Suwon, Republic of Korea.
authors.forename: Hyeon Jin
authors.initials: HJ
authors.lastname: Choi
authors.forename: Myeong Ho
authors.initials: MH
authors.lastname: Kim
authors.forename: Min Seok
authors.initials: MS
authors.lastname: Cho
authors.forename: Byoung Kyu
authors.initials: BK
authors.lastname: Kim
authors.forename: Joo Young
authors.initials: JY
authors.lastname: Kim
authors.forename: Changkug
authors.initials: C
authors.lastname: Kim
authors.forename: Dong Suk
authors.initials: DS
authors.lastname: Park
mesh_terms: D000123:Acetyltransferases / Q000235:genetics; D001431:Bacteriological Techniques / Q000379:methods*; D017931:DNA Primers / Q000235:genetics; D011550:Pseudomonas aeruginosa / Q000201:enzymology / Q000235:genetics / Q000302:isolation & purification*; D060888:Real-Time Polymerase Chain Reaction / Q000379:methods*; D012680:Sensitivity and Specificity
chemical_list: D017931:DNA Primers; D000123:Acetyltransferases; C071936:lipopolysaccharide O-antigen acetyltransferase