Fluorescence in situ hybridization and catalyzed reporter deposition for the identification of marine bacteria

被引:770
作者
Pernthaler, A [1 ]
Pernthaler, J [1 ]
Amann, R [1 ]
机构
[1] Max Planck Inst Marine Mikrobiol, D-28359 Bremen, Germany
关键词
D O I
10.1128/AEM.68.6.3094-3101.2002
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Fluorescence in situ hybridization (FISH) with horseradish peroxidase (HRP)-labeled oligonucleotide probes and tyramide signal amplification, also known as catalyzed reporter deposition (CARD), is currently not generally applicable to heterotrophic bacteria in marine samples. Penetration of the HRP molecule into bacterial cells requires permeabilization procedures that cause high and most probably species-selective cell loss. Here we present an improved protocol for CARD-FISH of marine planktonic and benthic microbial assemblages. After concentration of samples onto membrane filters and subsequent embedding of filters in low-gelling-point agarose, no decrease in bacterial cell numbers was observed during 90 min of lysozyme incubation (10 mg ml(-1) at 37degreesC). The detection rates of coastal North Sea bacterioplankton by CARD-FISH with a general bacterial probe (EUB338-HRP) were significantly higher (mean, 94% of total cell counts; range, 85 to 100%) than that with a monolabeled probe (EUB338-mono; mean, 48%; range, 19 to 66%). Virtually no unspecific staining was observed after CARD-FISH with an antisense EUB338-HRP. Members of the marine SAR86 clade were undetectable by FISH with a monolabeled probe; however, a substantial population was visualized by CARD-FISH (mean, 7%; range, 3 to 13%). Detection rates of EUB338-HRP in Wadden Sea sediments (mean, 81%; range, 53 to 100%) were almost twice as high as the detection rates of EUB338-mono (mean, 44%; range, 25 to 71%). The enhanced fluorescence intensities and signal-to-background ratios make CARD-FISH superior to FISH with directly labeled oligonucleotides for the staining of bacteria with low rRNA content in the marine environment.
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页码:3094 / 3101
页数:8
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