1887

Abstract

Abstract

In an attempt to develop a rapid and accurate method for discrimination of streptomycetes at the strain level, 21 strains identified by fatty acid analysis as and the type strains of nine subjective synonyms of were selected for a full or partial 16S ribosomal DNA (rDNA) sequence analysis and an investigation of the 16S-23S rDNA intergenic spacer region. 16S rDNA sequence analysis showed that 27 of the strains exhibited 100% sequence similarity; these strains included the type strain of and the type strains of the subjective synonyms , , , , , and The type strains of the other subjective synonyms of (i.e., , , and ) were found to have levels of 16S rDNA sequence difference of 1.0 to 1.1% when they were compared to the type strain of 5. In order to discriminate between the strains which had identical 16S rDNA sequences, the 16S-23S rDNA intergenic spacer regions were amplified and cloned, and the sequences of the spacer regions were determined for four strains, including the type strain. The 16S-23S rDNA intergenic spacer region was found to vary in length and sequence composition among the strains and within each strain. The sizes and numbers of 16S-23S rDNA intergenic spacer regions for the 27 strains with identical 16S rDNA sequences were determined by high-resolution electrophoresis of FAM-labeled PCR products and a subsequent size analysis with GeneScan 672 software. This was shown to be a useful method for discrimination of strains. Strains with the same 16S-23S rDNA intergenic spacer band pattern, as determined by high-resolution electrophoresis of FAM-labeled PCR products, could be further discriminated on the basis of the sequence composition of the spacer region.

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1997-01-01
2022-05-22
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