Sensitivity of the ZIKV real-time assay was evaluated by testing dilutions of known copy numbers of an RNA transcript copy of the ZIKV 2007 sequence. Copy numbers of RNA were determined by using the Ribogreen RNA-specific Quantitiation Kit (Invitrogen) and the TBE-380 mini-fluorometer (Turner Biosystems, Sunnyvale, CA, USA). RNA transcripts ranging from 16,000 to 0.2 copies were tested in quadruplicate to determine the sensitivity limit and to construct a standard curve for estimating the genome copy number of ZIKV in patient samples. All serum samples obtained during the epidemic were tested for ZIKV RNA by using this newly designed real-time RT-PCR. Concentration of viral RNA (copies/milliliter) was estimated in ZIKV-positive patients by using the standard curve calculated by the iCycler instrument (
Virus Replication
This involves the virus hijacking the host's cellular machinery to produce more copies of the viral genome and assemble new viral particles.
Understanding virus replication is crucial for developing effective treatments and preventive measures against viral infections.
PubCompare.ai can help optimize your virus replication research by locating relevant protocols from literature, preprints, and patents, while leveraging AI-driven comparisions to identify the most accurate and reproducible methods.
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Most cited protocols related to «Virus Replication»
Sensitivity of the ZIKV real-time assay was evaluated by testing dilutions of known copy numbers of an RNA transcript copy of the ZIKV 2007 sequence. Copy numbers of RNA were determined by using the Ribogreen RNA-specific Quantitiation Kit (Invitrogen) and the TBE-380 mini-fluorometer (Turner Biosystems, Sunnyvale, CA, USA). RNA transcripts ranging from 16,000 to 0.2 copies were tested in quadruplicate to determine the sensitivity limit and to construct a standard curve for estimating the genome copy number of ZIKV in patient samples. All serum samples obtained during the epidemic were tested for ZIKV RNA by using this newly designed real-time RT-PCR. Concentration of viral RNA (copies/milliliter) was estimated in ZIKV-positive patients by using the standard curve calculated by the iCycler instrument (
Most recents protocols related to «Virus Replication»
Example 3
Investigation of Virus Infectivity as a Factor that Determines Plaque Size.
With the revelation that plaque formation is strongly influenced by the immunogenicity of the virus, the possibility that infectivity of the virus could be another factor that determines plaque sizes was investigated. The uptake of viruses into cells in vitro was determined by measuring the amounts of specific viral RNA sequences through real-time PCR.
To measure total viral RNA, total cellular RNA was extracted using the RNEasy Mini kit (Qiagen), and complementary DNA synthesized using the iScript cDNA Synthesis kit (Bio-Rad). To measure total viral RNA, quantitative real-time PCR was done using a primer pair targeting a highly conserved region of the 3′ UTR common to all four serotypes of dengue; inter-sample normalization was done using GAPDH as a control. Primer sequences are listed in Table 5. Pronase (Roche) was used at a concentration of 1 mg/mL and incubated with infected cells for five minutes on ice, before washing with ice cold PBS. Total cellular RNA was then extracted from the cell pellets in the manner described above.
The proportion of infected cells was assessed by flow cytometry. Cells were fixed and permeabilised with 3% paraformaldehyde and 0.1% saponin, respectively. DENV envelope (E) protein was stained with mouse monoclonal 4G2 antibody (ATCC) and AlexaFluor488 anti-mouse secondary antibody. Flow cytometry analysis was done on a BD FACS Canto II (BD Bioscience).
Unexpectedly, despite DENV-2 PDK53 inducing stronger antiviral immune responses, it had higher rates of uptake by HuH-7 cells compared to DENV-2 16681 (
Results above demonstrate that the DENV-2 PDK53 and DENV-3 PGMK30 are polarized in their properties that influence plaque morphologies. While both attenuated strains were selected for their formation of smaller plaques compared to their parental strains, the factors leading to this outcome are different between the two.
Accordingly, this study has demonstrated that successfully attenuated vaccines, as exemplified by DENV-2 PDK53 in this study, form smaller plaques due to induction of strong innate immune responses, which is triggered by fast viral uptake and spread of infection. In contrast, DENV-3 PGMK30 form smaller plaques due to its slower uptake and growth in host cells, which inadvertently causes lower up-regulation of the innate immune response.
Based on the results presented in the foregoing Examples, the present invention provides a new strategy to prepare a LAV, which expedites the production process and ensures the generation of effectively attenuated viruses fit for vaccine use.
Example 5
To determine whether cytotoxicity of OTS-412 was maintained despite the inhibition of OTS-412 virus replication by GCV, the cytotoxicity between the following groups was compared: groups treated with the wild type HSV1-TK-expressing vaccinia virus, alone or in combination with GCV, and groups treated with OTS-412, alone or in combination with GCV. Specifically, HCT-116 cancer cells were treated with 0.05 MOI (0.05 pfu/cell) of wild type HSV1-TK-expressing vaccinia virus or OTS-412, alone or in combination with GCV (50 μg). The resulting cells were cultured for 72 hours and analyzed for cytotoxicity using CCK8 (Cell Counting Kit 8).
As a result, the cytotoxicity of OTS-412 and GCV combined treatment was maintained at 95% or more of OTS-412 single treated group whereas the vaccinia virus expressing wild-type HSV1-TK showed almost no cytotoxicity (
PrankWeb [49] (link) was used to determine the number of pockets and the amino acid residues that comprise them. This program also described the size (volume), depth, surface area or general hydrophobicity of each pocket (
Couplings were carried out using AutoDock Vina version 4.2.6 [53] (link), with an exhaustiveness value of 20 and a grid box of 24 Å × 24 Å × 24 Å, centered at (116.7829 Å, 109.9570 Å, 123.9430 Å) (XYZ coordinates) for RdRp (PDB ID: 6M71), (28.6904 Å, −1.9647 Å, 13.6836 Å) for ExoN-NSP10 (PDB: 7MC6) and (−47.585 Å, 1.135 Å, −5.600 Å) for 3CLpro (PDB ID:6M2N) (
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More about "Virus Replication"
This involves the virus hijacking the host's cellular machinery to produce more copies of the viral genome and assemble new viral particles.
Understanding the mechanisms of virus replication is crucial for developing effective treatments and preventive measures against viral infections, such as those caused by SARS-CoV-2, influenza, HIV, and hepatitis viruses.
To study virus replication, researchers often utilize various techniques and reagents, including Lipofectamine 2000 for transfecting cells, DMEM (Dulbecco's Modified Eagle Medium) and FBS (Fetal Bovine Serum) for cell culture, TRIzol reagent and the RNeasy Mini Kit for RNA extraction, and Prism 9 for data analysis.
Additionally, Lipofectamine 3000 and the QIAamp Viral RNA Mini Kit may be employed for viral genome isolation and purification.
Optimizing virus replication research is crucial, and tools like PubCompare.ai can help researchers locate relevant protocols from literature, preprints, and patents, while leveraging AI-driven comparisons to identify the most accurate and reproducible methods.
By enhancing their research with PubCompare.ai's powerful tools, researchers can achieve better results and advance our understanding of virus replication, ultimately leading to improved treatments and preventive measures against viral infections.
Key subtopics related to virus replication include viral entry, genome replication, transcription, translation, assembly, and release.
Researchers may also investigate the role of host cellular factors, signaling pathways, and immune responses in the virus replication process.
Abbreviations commonly used in this field include SARS-CoV-2 (Severe Acute Respiratory Syndrome Coronavirus 2), HIV (Human Immunodeficiency Virus), and RNA (Ribonucleic Acid).