Giant Virus Isolation
Giant Virus Isolation - Related Videos
04:12
Isolation of a Single Giant Virus from a Mixed Viral Population Using Amoebae
0 Views •
2026
Source: Sahmi-Bounsiar, D. et al. Single Cell Micro-aspiration as an Alternative Strategy to Fluorescence-activated Cell Sorting for Giant Virus Mixture Separation. J. Vis. Exp. (2019)This video demonstrates single-cell micro-aspiration to isolate and expand a single giant virus population from a mixed viral population using amoebae as host cells.
03:25
Amoeba-Based Enrichment of Giant Viruses from an Environmental Water Sample
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2026
Source: Bou Khalil, J. Y.,et al. A Rapid Strategy for the Isolation of New Faustoviruses from Environmental Samples Using Vermamoeba vermiformis. J. Vis. Exp. (2016)This video demonstrates the enrichment of giant viruses from an environmental water sample using amoeba-based co-culture to enable downstream detection and analysis.
09:50
Single Cell Micro-aspiration as an Alternative Strategy to Fluorescence-activated Cell Sorting for Giant Virus Mixture Separation
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Cited by 5 •
2019
Here, we describe a single cell micro-aspiration method for the separation of infected amoebae. In order to separate viral subpopulations in Vermamoeba vermiformis infected by Faustoviruses and unknown giant viruses, we developed the protocol detailed below and demonstrated its ability to separate two low-abundance novel giant viruses.
10:07
Isolation of Giant Lampbrush Chromosomes from Living Oocytes of Frogs and Salamanders
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Cited by 12 •
2016
We present simple techniques for isolating giant transcriptionally active lampbrush chromosomes from living oocytes of frogs and salamanders. We describe how to observe these chromosomes "alive" by phase contrast or differential interference contrast, and how to fix them for fluorescent in situ hybridization or immunofluorescent staining.
18:10
Isolation of Fidelity Variants of RNA Viruses and Characterization of Virus Mutation Frequency
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Cited by 40 •
2011
The present article describes the steps required to isolate and characterize RNA polymerase fidelity variants of RNA viruses and how to use mutation frequency data to confirm fidelity changes in tissue culture.
FAQs
Susceptible amoebal hosts function as biological amplification systems. If a virus in the preparation can infect them, infection produces new particles that increase the detectable signal. The resulting cytopathic changes also provide a visible indication of host-virus interaction, helping distinguish potentially infectious material from particles or components that were merely present in the original sample.
Sample concentration increases the amount of material carried forward, while filtration removes many cellular contaminants before host exposure. Together, these steps make the preparation more suitable for testing with amoebae than an untreated environmental or biological sample. Their purpose is selective enrichment, reducing interfering material while retaining access to viruses that standard approaches might miss.
Cytopathic changes provide a visual readout of infection in the exposed amoebal host. When these changes appear, they indicate that the preparation has produced detectable effects in susceptible cells and justify further examination for newly produced virus particles. This observation helps guide the transition from host exposure to microscopy and subsequent purification.
The approach expands recovery beyond methods that may overlook unusually large viruses. Its use of sample preparation, susceptible amoebal hosts, visible cytopathic effects, and particle examination creates several opportunities to detect and recognize viruses that could remain underrepresented in conventional analyses. This is particularly useful when investigating viral diversity in environmental or biological material.
A typical workflow concentrates an environmental or biological sample, filters it to remove many cellular contaminants, and exposes susceptible amoebal hosts to the resulting preparation. Researchers then look for cytopathic changes, examine newly produced particles by microscopy, and purify material for analysis. Each stage narrows the sample from mixed source material toward a characterized viral isolate.
Microscopy allows researchers to inspect the particles produced after host exposure and to evaluate whether the infection generated recognizable virus material. Purification then separates the viral material from remaining components of the preparation, making it more suitable for downstream genomic and structural characterization. These steps connect visible particle recovery with detailed biological analysis.
Genomic and structural characterization can support investigations of virus evolution, host interactions, and replication strategies. Examining both genetic information and particle structure provides complementary evidence: the genome helps place the isolate in an evolutionary and functional context, while structural analysis contributes information about the physical virus particle. Together, these data deepen interpretation beyond initial recovery.
Isolating these viruses gives researchers access to viral diversity that sampling and detection methods may otherwise miss. The resulting isolates can be studied in relation to their amoebal hosts and broader microbial environments, helping clarify how viruses interact with microbial life, how they replicate, and how they contribute to the biological complexity of ecosystems.