Document Detail


In situ identification of Legionellaceae using 16S rRNA-targeted oligonucleotide probes and confocal laser scanning microscopy.
MedLine Citation:
PMID:  7534589     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Bacteria of the family Legionellaceae form a monophyletic group within the gamma-subclass of Proteobacteria. Based on comparative sequence analysis we constructed two oligonucleotide probes complementary to regions of 16S rRNA characteristic for Legionellaceae. Probe specificities were tested by whole-cell or dot-blot hybridization against 14 serogroups of Legionella pneumophila, 22 different Legionella spp. and 72 non-legionellae reference strains. Using optimized conditions both probes hybridized to all tested strains of L. pneumophila. Probes LEG226 and LEG705 hybridized to 71% and 90% of the Legionella species tested, respectively. With the exception of Methylomonas alba none of the non-target strains showed complete sequence homology within the target molecule. In a preliminary evaluation the results of classical techniques employing selective media, immunofluorescence and the probe assay were in good accordance for routine environmental and clinical isolates. L. pneumophila suspended in drinking water at approximately 10(3)-10(4) c.f.u. ml-1 could be rapidly detected by a combination of membrane filtration on polycarbonate filters and whole-cell hybridization. Even after incubation for 1 year a proportion of the released cells was still detectable. In situ hybridization also facilitated visualization of Legionella spp, cells in model biofilms. A combination of in situ hybridization and confocal laser scanning microscopy (CLSM) was used to analyse the three-dimensional arrangement of L. pneumophila within cells of the ciliated protozoan Tetrahymena pyriformis. Whole-cell probing with 16S rRNA-targeted oligonucleotides could, in the future, complement established techniques like immunofluorescence and PCR in ecological and epidemiological studies of Legionellaceae.
Authors:
W Manz; R Amann; R Szewzyk; U Szewzyk; T A Stenström; P Hutzler; K H Schleifer
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Microbiology (Reading, England)     Volume:  141 ( Pt 1)     ISSN:  1350-0872     ISO Abbreviation:  Microbiology (Reading, Engl.)     Publication Date:  1995 Jan 
Date Detail:
Created Date:  1995-04-27     Completed Date:  1995-04-27     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9430468     Medline TA:  Microbiology     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  29-39     Citation Subset:  IM    
Affiliation:
Lehrstuhl für Mikrobiologie, Technische Universität München, Germany.
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MeSH Terms
Descriptor/Qualifier:
Animals
Base Sequence
DNA, Bacterial / analysis
Humans
In Situ Hybridization / methods
Legionella / genetics,  isolation & purification*
Legionella pneumophila / isolation & purification
Legionellaceae / genetics,  isolation & purification*
Microscopy, Confocal / methods
Molecular Sequence Data
Oligonucleotide Probes
RNA, Bacterial / analysis
RNA, Ribosomal, 16S / analysis*,  biosynthesis
Sensitivity and Specificity
Tetrahymena pyriformis / microbiology
Water Microbiology
Water Supply
Chemical
Reg. No./Substance:
0/DNA, Bacterial; 0/Oligonucleotide Probes; 0/RNA, Bacterial; 0/RNA, Ribosomal, 16S

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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