Species identification of Legionella via intergenic 16S-23S ribosomal spacer PCR analysis

被引:36
|
作者
Riffard, S
Lo Presti, F
Normand, P
Forey, F
Reyrolle, M
Etienne, J
Vandenesch, F
机构
[1] Fac Med RTH Laennec, UPRES EA 1655, Ctr Natl Reference Legionella, F-69372 Lyon 08, France
[2] Univ Claude Bernard, UMR CNRS 5557, Lab Ecol Microbienne Sol, F-69622 Villeurbanne, France
来源
INTERNATIONAL JOURNAL OF SYSTEMATIC BACTERIOLOGY | 1998年 / 48卷
关键词
Legionellaceae; 16S-23S intergenic spacer; ISR-PCR;
D O I
10.1099/00207713-48-3-723
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Species identification of Legionella in routine laboratory testing is hampered by the lack of highly discriminatory phenotypic tests, Amplification polymorphism of the intergenic 16S-23S spacer regions (ISR) has been previously developed for identification of species within the Legionellaceae [Hookey, J. V., Birtles, R. J. & Saunders, N. A. (1995). J. Clin Microbiol 33, 2377-2381], but it did not provide enough resolution to distinguish all members of the bluish-white autofluorescent species and the red autofluorescent group of the Legionellaceae. By choosing new primers that target regions 4 (positions 1521-1541 of Escherichia coli 16S rRNA gene) and 6 (positions 114-132 of E. coli 23S rRNA gene) within the rDNA operon close to the 16S-23S intergenic spacer, 34 profiles were determined among the 79 type and reference strains representing 42 species that were tested. Analysis of the RFLP generated after HinfI restriction digestion of the PCR products further improved the method, allowing complete discrimination among the species and subspecies of Legionella tested. Twenty-three well-identified strains from unrelated origins belonging to seven species gave amplification patterns identical to that of their type strain. The technique was also tested on 80 field isolates that. could not be unequivocally assigned to groups by phenotypic methods. Seventy-two per cent (58/80) of these isolates had a profile identical to that of a type strain, while 27% (22/80) may correspond to new taxa since their ISR-PCR profiles did not match any of the known profiles.
引用
收藏
页码:723 / 730
页数:8
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