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Monitoring co-cultures of Clostridium carboxidivorans and Clostridium kluyveri by fluorescence in situ hybridization with specific 23S rRNA oligonucleotide probes. 2021

Martina Schneider, and Miriam Bäumler, and Natuschka M Lee, and Dirk Weuster-Botz, and Armin Ehrenreich, and Wolfgang Liebl
Chair of Microbiology, Technical University of Munich, TUM School of Life Science, Freising, Germany.

The development of co-cultures of clostridial strains which combine different physiological traits represents a promising strategy to achieve the environmentally friendly production of biofuels and chemicals. For the optimization of such co-cultures it is essential to monitor their composition and stability throughout fermentation. FISH is a quick and sensitive method for the specific labeling and quantification of cells within microbial communities. This technique is neither limited by the anaerobic fermenter environment nor by the need of prior genetic modification of strains. In this study, two specific 23S rRNA oligonucleotide probes, ClosKluy and ClosCarb, were designed for the monitoring of C. kluyveri and C. carboxidivorans, respectively. After the optimization of hybridization conditions for both probes, which was achieved at 30% (v/v) formamide, a high specificity was observed with epifluorescence microscopy using cells from different pure reference strains. The discriminating properties of the ClosKluy and ClosCarb probes was verified with samples from heterotrophic co-cultures in anaerobic flasks as well as autotrophic stirred-tank bioreactor co-cultures of C. kluyveri and C. carboxidivorans. Besides being suited to monitor defined co-cultures of these two species, the new specific FISH oligonucleotide probes for C. kluyveri and C. carboxidivorans additionally have potential to be applied in environmental studies.

UI MeSH Term Description Entries
D003013 Clostridium A genus of motile or nonmotile gram-positive bacteria of the family Clostridiaceae. Many species have been identified with some being pathogenic. They occur in water, soil, and in the intestinal tract of humans and lower animals.
D012336 RNA, Ribosomal, 16S Constituent of 30S subunit prokaryotic ribosomes containing 1600 nucleotides and 21 proteins. 16S rRNA is involved in initiation of polypeptide synthesis. 16S Ribosomal RNA,16S rRNA,RNA, 16S Ribosomal,Ribosomal RNA, 16S,rRNA, 16S
D012338 RNA, Ribosomal, 23S Constituent of 50S subunit of prokaryotic ribosomes containing about 3200 nucleotides. 23S rRNA is involved in the initiation of polypeptide synthesis. 23S Ribosomal RNA,23S rRNA,RNA, 23S Ribosomal,Ribosomal RNA, 23S,rRNA, 23S
D015345 Oligonucleotide Probes Synthetic or natural oligonucleotides used in hybridization studies in order to identify and study specific nucleic acid fragments, e.g., DNA segments near or within a specific gene locus or gene. The probe hybridizes with a specific mRNA, if present. Conventional techniques used for testing for the hybridization product include dot blot assays, Southern blot assays, and DNA:RNA hybrid-specific antibody tests. Conventional labels for the probe include the radioisotope labels 32P and 125I and the chemical label biotin. Oligodeoxyribonucleotide Probes,Oligonucleotide Probe,Oligoribonucleotide Probes,Probe, Oligonucleotide,Probes, Oligodeoxyribonucleotide,Probes, Oligonucleotide,Probes, Oligoribonucleotide
D017404 In Situ Hybridization, Fluorescence A type of IN SITU HYBRIDIZATION in which target sequences are stained with fluorescent dye so their location and size can be determined using fluorescence microscopy. This staining is sufficiently distinct that the hybridization signal can be seen both in metaphase spreads and in interphase nuclei. FISH Technique,Fluorescent in Situ Hybridization,Hybridization in Situ, Fluorescence,FISH Technic,Hybridization in Situ, Fluorescent,In Situ Hybridization, Fluorescent,FISH Technics,FISH Techniques,Technic, FISH,Technics, FISH,Technique, FISH,Techniques, FISH
D047010 Clostridium kluyveri A species of gram-positive bacteria in the family Clostridiaceae. It is distinctive for its ability to ferment ETHANOL to caproic acid.
D018920 Coculture Techniques A technique of culturing mixed cell types in vitro to allow their synergistic or antagonistic interactions, such as on CELL DIFFERENTIATION or APOPTOSIS. Coculture can be of different types of cells, tissues, or organs from normal or disease states. Cocultivation,Co-culture,Coculture,Co culture,Co-cultures,Cocultivations,Coculture Technique,Cocultures

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