1887

Abstract

Partial sequences of the gene (1249 bp), which encodes a recombination and repair protein, were analysed to determine the phylogenetic relationship and identification of streptococci. The partial sequences presented interspecies nucleotide similarity of 56.4–98.2 % and intersubspecies similarity of 89.8–98 %. The mean DNA sequence similarity of gene sequences (66.6 %) was found to be lower than those of the 16S rRNA gene (94.1 %), (84.6 %), (74.8 %), (78.1 %) and (73.2 %). Phylogenetically derived trees revealed six statistically supported groups: , , //, , and . The ‘mitis’ group was not supported by a significant bootstrap value, but three statistically supported subgroups were noted: //, (the ‘anginosus’ subgroup) and //////. The partial gene sequence comparison highlighted a high percentage of divergence between subsp. and subsp. . This observation is confirmed by other gene sequence comparisons (, , and ). A high percentage of similarity was found between and after sequence comparison of the gene. To study the genetic diversity among the ‘anginosus’ subgroup, , , , and sequences were determined for 36 clinical isolates. The results that were obtained confirmed the high genetic diversity within this group of streptococci.

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2010-09-01
2024-04-19
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