A modified PCR-based method for rapid non-radioactive detection of clinically important pathogens.
We have devised a sensitive and rapid method for the detection of several bacterial pathogens in clinical specimens using PCR. This method has been named Direct Labeling and Detection Procedure (DLDP) and is based on the direct incorporation of a nonradioactive digoxigenin label (DIG-11-dUTP) into a microbial species-specific gene fragment during amplification. Following amplification, the resulting PCR products are cleansed of nonincorporated DIG-11-dUTP, spotted onto a nylon membrane, fixed by UV-crosslinking and the labeled DNA is visualized by digoxigenin detection reagents. Using cultivated reference bacteria (Staphylococcus aureus, Streptococcus pneumoniae, Pseudomonas aeruginosa) we were able to demonstrate a rapid and sensitive detection of < 20 CFU of bacteria in human secretions (sputum, urine, mucous). The present study suggests that DLDP can be used as a reliable method for indication of bacteria in clinical or environmental specimens with the proviso that the selected corresponding oligonucleotide primers provide amplification of strong species-specific genes.
Department of Surgery A, Heinrich Heine University, Düsseldorf, Germany.
V N
VN
Gorelov
K
K
Dumon
N S
NS
Barteneva
H D
HD
Röher
P E
PE
Goretzki
D001419:Bacteria / Q000302:isolation & purification*; D001424:Bacterial Infections / Q000382:microbiology* / Q000652:urine; D004269:DNA, Bacterial / Q000235:genetics / Q000302:isolation & purification; D006801:Humans; D016106:Methicillin Resistance; D009093:Mucus / Q000382:microbiology; D016133:Polymerase Chain Reaction / Q000379:methods*; D011550:Pseudomonas aeruginosa / Q000302:isolation & purification; D015203:Reproducibility of Results; D013183:Sputum / Q000382:microbiology; D013211:Staphylococcus aureus / Q000302:isolation & purification; D013296:Streptococcus pneumoniae / Q000302:isolation & purification
D004269:DNA, Bacterial