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J Clin Microbiol. 1992 June; 30(6): 1499-1504

Length polymorphisms in tRNA intergenic spacers detected by using the polymerase chain reaction can distinguish streptococcal strains and species.

California Institute of Biological Research, La Jolla, California 92037.

ABSTRACT

Intergenic tRNA spacers from strains of streptococcal groups A, B, and G were amplified by using the polymerase chain reaction (PCR) at low stringency with consensus tRNA gene primers. Cloning and sequencing showed that many of the homologous intergenic spacers differed in length between species. The sequences of the tRNA genes that flank these polymorphic spacers were determined and used to synthesize fully complementary primers. With these primers at high stringency, PCR products which varied in lengths from 53 to 71 bp, depending on the species or strain, were obtained from streptococcal DNAs, even in the presence of a 1,000-fold mass excess of human DNA. PCR products, the lengths of which could also be used for classification, were obtained at high stringency from a few genera closely related to Streptococcus. No products were obtained from genomic DNAs from more distantly related genera. Production of species- or strain-specific tRNA intergenic length polymorphisms with primers that generate characteristic products from a variety of species within the same genus should be applicable to many organisms, including those that would otherwise be difficult to culture or identify.

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