1887

Abstract

is an emerging pathogen of increasing medical significance. Previous investigations have revealed two different 16S rRNA gene variants among isolates, resulting in delineation of the population into 16S RNA type I and type II isolates. While studying 191 isolates by multi-locus sequence typing (MLST) we detected three isolates that could not be assigned to a distinct 16S RNA type upon direct sequencing because of ambiguous nucleotides in a distinct region of the 16S rRNA gene. Cloning and sequencing of the target region of the 16S rRNA gene suggested that these atypical isolates contained different 16S rRNA gene copies. Southern blot and hybridization experiments confirmed the presence of two different 16S RNA gene copies in each isolate. The isolates were further analysed by 16S RNA type-specific PCR, which assigned them to both 16S RNA types I and II. These results suggest that a small percentage of isolates may harbour two different 16S rRNA gene copies. These isolates, which accounted for 1.6 % of the isolates in our study, have probably emerged by horizontal gene transfer. The implications of these findings for identification and genotyping studies on are discussed.

Keyword(s): ST, sequence type
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2008-09-01
2019-10-14
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