Detection of two Shiga-like toxins from Escherichia coli O157:H7 isolates by the polymerase chain reaction method.
- 1 January 1990
- journal article
- abstracts
- Published by Japanese Society for Bacteriology in Nippon Saikingaku Zasshi
- Vol. 45 (3) , 649-652
- https://doi.org/10.3412/jsb.45.649
Abstract
Fourteen isolates of E. coli O157:H7 and five isolates of S. dysenteriae type-1 were examined by polymerase chain reaction (PCR) for the structural genes (slt-I or slt-II), encoding Shiga-like toxins (SLTs). The two primer pairs (V1; 5'AGTTAATGTGGTGGCGAA and V2; 5'GACTGCGTCAGTGAGGTT for SLT-I, V3; 5'TTCGGTATCCTATTCCCG and V4; 5'TCTCTGGTCATTGTATTA for SLT-II) used were of the same positions representing the DNA sequence covering 471bp of the slt-I or slt-II. A 5-microliter portion of boiled bacterial culture broth was used as template DNA in a PCR-reaction mixture of 50 microliters. Two classes, slt-I alone or both slt-I and slt-II, were recognized in E. coli strains. All of S. dysenteriae type-1 strains examined contained slt-I alone. Our results indicate that PCR using these primer pairs is a simple, rapid, sensitive, and specific method and suitable for use in routine diagnostic microbiology laboratories.Keywords
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