1887

Abstract

SUMMARY

To develop a rapid and accurate method of typing large numbers of clinical isolates of , the spacer region C of the rRNA operon [1391-507 (16S-23S)] was enzymically amplified from 322 strains. When the products were separated by denaturing PAGE, 15 variable-length alleles were demonstrated, ranging in size from 906 to 1223 bp. The variable-length II-digested region C [(region E; 1446-196 (16S-23S)] amplification products were cloned into M13mp18RF to sequence separate variable-length alleles. A total of 17 region E inserts were sequenced, aligned and divided into nine alleles by length (938-1174) and sequence properties. The 16S-23S spacer rDNA varied in length (303-551 bp) and in properties; three alleles contained a tRNA gene alone, two alleles contained a tRNA and a tRNA gene, and four alleles lacked tRNA genes. The sequences of two alleles showed less than 1% variation when isolated from two or three strains. The 48 penicillin-and methicillin-sensitive strains were divided into 26 ribotypes; in contrast, the 274 methicillin-resistant (MRSA) strains were divided into nine ribotypes (A-I) with 97% typing as either ribotype A or B ( was missing in B). The sequence conservation of the operons argues for the use of the 16S-23S spacer region as a stable and direct indicator of the evolutionary divergence of strains.

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1995-05-01
2021-05-08
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