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. 1985 Nov;50(5):1187–1191. doi: 10.1128/aem.50.5.1187-1191.1985

Synthetic oligodeoxyribonucleotide probes for detecting heat-stable enterotoxin-producing Escherichia coli by DNA colony hybridization.

W E Hill, W L Payne, G Zon, S L Moseley
PMCID: PMC238722  PMID: 3911894

Abstract

DNA colony hybridization was used to identify and enumerate enterotoxigenic Escherichia coli strains in foods. The cells were identified and enumerated by using synthetic polynucleotide probes for the heat-stable enterotoxin genes. These 22-base oligonucleotides, made from known nucleotide sequences of the genes for the heat-stable enterotoxins of human and porcine strains of E. coli, contain two mismatches between the two heat-stable enterotoxins. Colonies were replicated from agar medium onto paper filters and lysed with alkali followed by steam; probes were end labeled. After overnight hybridization at 40 degrees C and washing at 50 degrees C, autoradiograms were exposed at -70 degrees C. Results were consistent with suckling-mouse tests for heat-stable enterotoxins. A stronger signal was obtained on paper filters than on nitrocellulose filters. Enterotoxigenic E. coli cells were detected when mixed with a 1,000-fold excess of nonenterotoxigenic E. coli cells. This procedure appears to be more acceptable for routine testing than the use of cloned DNA fragments, labeling by nick translation, and lysing colonies on nitrocellulose filters.

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Selected References

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