title: A 16S rRNA-based DNA probe and PCR method specific for Listeria ivanovii.
abstract: A 16S rRNA-based DNA probe and polymerase chain reaction (PCR) method was developed for identification and rapid detection of Listeria ivanovii. The probe (R-1) is 5'-GTAGTGACGCATGTCATCAC-3' corresponding to positions 185-204 in the L. ivanovii 16S rRNA sequence. DNA hybridization results indicated that R-1 probe only reacted with L. ivanovii, and not with six other species of Listeria or other bacteria tested. The PCR method using R-1 and a reverse primer, R-2, was positive with all eight strains of L. ivanovii tested but was negative with six other species of Listeria, including nine strains of L. monocytogenes, and 20 other taxonomically related bacteria tested. In our PCR method, starting with whole bacterial cells, only 3 h were required for the PCR assay and 1 h for electrophoresis without any additional time for DNA isolation and DNA hybridization. This PCR method detected as few as 4 cells of L. ivanovii in pure cultures and 4-40 cells of L. ivanovii in inoculated and diluted mouse feed, blood, or faeces samples.
authors.affiliation: Department of Food Science and Biotechnology Center, University of Arkansas, Fayetteville, Arkansas 72703.
authors.forename: R F
authors.initials: RF
authors.lastname: Wang
authors.forename: W W
authors.initials: WW
authors.lastname: Cao
authors.forename: H
authors.initials: H
authors.lastname: Wang
authors.forename: M G
authors.initials: MG
authors.lastname: Johnson
mesh_terms: D001483:Base Sequence; D015342:DNA Probes / Q000235:genetics; D015151:Immunoblotting; D008087:Listeria / Q000235:genetics / Q000302:isolation & purification*; D008969:Molecular Sequence Data; D009693:Nucleic Acid Hybridization; D016133:Polymerase Chain Reaction / Q000379:methods*; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012680:Sensitivity and Specificity
chemical_list: D015342:DNA Probes; D012336:RNA, Ribosomal, 16S