Differentiation of bacterial 16S rRNA genes and intergenic regions and Mycobacterium tuberculosis katG genes by structure-specific endonuclease cleavage.

Journal of Clinical Microbiology
M A BrowJ E Dahlberg

Abstract

We describe here a new approach for analyzing nucleic acid sequences using a structure-specific endonuclease, Cleavase I. We have applied this technique to the detection and localization of mutations associated with isoniazid resistance in Mycobacterium tuberculosis and for differentiating bacterial genera, species and strains. The technique described here is based on the observation that single strands of DNAs can assume defined conformations, which can be detected and cleaved by structure-specific endonucleases such as Cleavase I. The patterns of fragments produced are characteristic of the sequences responsible for the structure, so that each DNA has its own structural fingerprint. Amplicons, containing either a single 5'-fluorescein or 5'-tetramethyl rhodamine label were generated from a 620-bp segment of the katG gene of isoniazid-resistant and -sensitive M. tuberculosis, the 5' 350 bp of the 16S rRNA genes of Escherichia coli O157:H7, Salmonella typhimurium, Salmonella enteritidis, Salmonella arizonae, Shigella sonnei, Shigella dysenteriae, Campylobacter jejuni, staphylococcus, hominis, Staphylococcus warneri, and Staphylococcus aureus and an approximately 550-bp DNA segment comprising the intergenic region between the 16...Continue Reading

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