Cold-adapted Virus Production
Cold-adapted Virus Production - Related Videos
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Liver Cold Storage and Transplantation in the Cold-Adaptive Daurian Ground Squirrels
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Here, we present a protocol to establish a long-term liver cold storage and transplantation model in Daurian ground squirrel (DGS), which has been technically challenging in standard rodent models.
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A Simple and Inexpensive Method for Determining Cold Sensitivity and Adaptation in Mice
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The Cold Plantar Assay (CPA) measures cold responsiveness between 30 °C and 5 °C, and can also measure cold adaptation. This protocol describes how to use the CPA to measure cold hypersensitivity, analgesia, and adaptation in mice.
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Estimating Virus Production Rates in Aquatic Systems
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The turnover rate of viruses in marine and freshwater systems can be estimated by a reduction and reoccurrence technique. The data allow researchers to infer rates of virus-mediated microbial mortality in aquatic systems.
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Production of Reporter-Containing Ebola Virus Transcription- and Replication-Competent Virus-Like Particles
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Source: Hoenen, T., et al. Modeling The Lifecycle Of Ebola Virus Under Biosafety Level 2 Conditions With Virus-like Particles Containing Tetracistronic Minigenomes. J. Vis. Exp. (2014)This video demonstrates how a tetracistronic minigenome plasmid mimicking the Ebola virus genome is transfected into human cells along with helper plasmids. Inside the cells, viral proteins and luciferase are expressed, leading to the assembly and budding of non-pathogenic, replication-competent virus-like...
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Production and Purification of Recombinant Hepatitis B Virus Particles
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Source: Nishitsuji, H., et al. Development of a Hepatitis B Virus Reporter System to Monitor the Early Stages of the Replication Cycle. J. Vis. Exp. (2017)This video demonstrates the production and purification of recombinant Hepatitis B virus particles, enabling safe, replication-deficient viral preparations for studying early infection events and for high-throughput antiviral drug screening applications.
FAQs
The key mechanism is a difference in replication efficiency across temperatures. Selected variants retain efficient growth under reduced-temperature conditions but show reduced growth at warmer temperatures associated with the host respiratory tract or body. This temperature-dependent restriction can limit viral spread in the host while allowing the virus to produce antigen capable of stimulating an immune response.
Selection identifies viral variants that preserve replication in cool conditions while displaying the desired reduction in growth at warmer temperatures. This balance is important because excessive restriction could reduce antigen production, whereas insufficient restriction might not adequately limit spread. Comparing growth under contrasting temperature conditions therefore helps characterize the attenuation-related behavior of candidate strains.
Their restricted growth pattern provides a way to examine how viral replication, antigen production, and host responses are connected. Because these viruses can remain active under reduced-temperature conditions while showing limited growth at warmer host-associated temperatures, researchers can investigate whether controlled replication is sufficient to stimulate immunity without unrestricted spread. This supports studies of attenuation and vaccine performance.
A typical workflow begins by introducing the virus into susceptible cells, then maintaining propagation under cool conditions that favor the intended phenotype. Researchers select variants that continue replicating in the cold and evaluate their growth at warmer temperatures. The resulting comparisons help determine whether a strain combines cold replication with the temperature-sensitive restriction relevant to attenuation.
The central conditions are the susceptibility of the cell system and the temperatures used for propagation and comparison. Cool conditions are needed to support selection for cold-efficient replication, while warmer conditions reveal whether growth becomes reduced in a host-relevant range. Evaluating both settings is necessary because performance at only one temperature cannot establish temperature-sensitive behavior.
They provide an experimental system for examining viral replication, attenuation, host responses, and vaccine performance within one temperature-dependent framework. In vaccine-oriented research, their ability to produce antigen under permissive conditions is relevant to immune stimulation, while reduced growth at warmer host-associated temperatures helps investigators assess whether replication is sufficiently restricted to support an attenuated profile.