Cloth-based hybridization array system for the detection of multiple antibiotic resistance genes in Salmonella enterica subsp. enterica serotype Typhimurium DT104.
OBJECTIVE
A simple DNA macroarray system was developed for detection of antibiotic resistance and other marker genes associated with the multidrug-resistant food pathogen Salmonella enterica subsp. enterica serotype Typhimurium DT104.


RESULTS
A multiplex polymerase chain reaction (PCR) incorporating digoxigenin-dUTP was used to simultaneously amplify seven marker sequences, with subsequent rapid detection of the amplicons by hybridization with an array of probes immobilized on polyester cloth and immunoenzymatic assay of the bound label. This system provided sensitive detection of the different genetic markers in the S. Typhimurium DT104 genome, giving positive reactions with as few as 10 CFU, and the hybridizations were highly specific, with no reactions of amplicons with heterologous probes on the array.


CONCLUSIONS
This cloth-based hybridization array system (CHAS) provides a simple, cost-effective tool for monitoring S. Typhimurium DT104 in foods and their production environment.


CONCLUSIONS
The CHAS is a simple and cost-effective tool for the simultaneous detection of amplicons generated in a multiplex PCR, and the concept is broadly applicable to the detection and characterization of food pathogens.
Gauthier
M
M
Ottawa Laboratory (Carling), Canadian Food Inspection Agency, Ottawa, Ont., Canada.
Blais
B W
BW
D001426:Bacterial Proteins / Q000235:genetics; D002702:Chloramphenicol Resistance / Q000235:genetics; D015342:DNA Probes; D004269:DNA, Bacterial / Q000032:analysis / Q000302:isolation & purification; D003856:Deoxyuracil Nucleotides / Q000276:immunology / Q000378:metabolism; D004076:Digoxigenin / Q000031:analogs & derivatives* / Q000276:immunology / Q000378:metabolism; D024901:Drug Resistance, Multiple, Bacterial / Q000235:genetics*; D005516:Food Microbiology; D005798:Genes, Bacterial; D007124:Immunoenzyme Techniques; D019426:Integrases / Q000235:genetics; D009693:Nucleic Acid Hybridization / Q000379:methods*; D016133:Polymerase Chain Reaction; D012486:Salmonella typhimurium / Q000187:drug effects* / Q000235:genetics*; D012680:Sensitivity and Specificity; D013753:Tetracycline Resistance / Q000235:genetics; D037521:Virulence Factors / Q000032:analysis / Q000235:genetics; D018440:beta-Lactam Resistance / Q000235:genetics
D001426:Bacterial Proteins; D015342:DNA Probes; D004269:DNA, Bacterial; D003856:Deoxyuracil Nucleotides; D037521:Virulence Factors; C070202:digoxigenin-11-deoxyuridine triphosphate; C075518:invA protein, Bacteria; D019426:Integrases; D004076:Digoxigenin