Bacmid Viral Genome
Bacmid Viral Genome - Related Videos
01:25
Generating Infectious Virus Particles Containing a BACmid-Derived Viral Genome
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2026
Begin with a BACmid, a bacterial artificial chromosome that can replicate like a plasmid inside bacteria.The BACmid contains the entire genome of the vaccinia virus with targeted modifications, but it is not infectious as it requires viral proteins to function.Take a helper virus, which is an attenuated vaccinia virus encoding the gene for EGFP.Infect epithelial cells with the helper virus and simultaneously transfect with the BACmid.The virus expresses EGFP and provides the viral proteins,...
06:57
Dot Blot Assay to Quantify Viral Genome
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2025
In this video, we describe the dot blot assay to quantify a viral genome. The signal intensity is directly related to the amount of viral DNA in the sample.
01:26
Size and Structure of Viral Genomes
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2025
Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...
08:31
Isolation and Genome Analysis of Single Virions using 'Single Virus Genomics'
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Cited by 2 •
2013
Single Virus Genomics (SVG) is a method to isolate and amplify the genomes of single virons. Viral suspensions of a mixed assemblage are sorted using flow cytometry onto a microscope slide with discrete wells containing agarose, thereby capturing the virion and reducing genome shearing during downstream processing. Whole genome amplification is achieved using multiple displacement amplification (MDA) resulting in genomic material that is suitable for sequencing.
03:20
Nested-PCR to Detect a Specific Viral Genomic Sequence
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2025
This video describes nested polymerase chain reaction, a technique that consists of two sequential PCR amplification processes using two primer sets. The first set of primers is intended to anneal to sequences upstream of the second set, resulting in selective amplification of specific gene sequences. This PCR is more sensitive and specific than a normal PCR and is widely used as a detection technique for various diseases.
FAQs
Targeted insertion at the designated attTn7 site gives the gene of interest a defined location within the bacmid viral genome. Transposon-mediated recombination performs this placement, after which antibiotic resistance and other markers support selection and verification in Escherichia coli. This arrangement helps distinguish engineered constructs from bacmids that lack the intended insert.
The bacterial phase and insect-cell phase serve different purposes in a bacmid viral genome workflow. Escherichia coli provides a setting for maintaining the large DNA molecule and carrying out cloning steps, whereas insect cells receive purified recombinant bacmid and produce infectious recombinant baculovirus particles. Separating these stages links DNA engineering with later gene expression.
Antibiotic resistance and other markers are useful because they connect the engineered DNA to practical selection and verification steps in bacteria. Resistance can support selection, while additional markers can contribute to checking whether the intended recombinant bacmid was obtained. These features make bacterial handling more controlled before DNA is purified for insect-cell work.
Once purified recombinant bacmid enters insect cells, it provides the genetic input for two linked outcomes: production of infectious recombinant baculovirus particles and expression of the inserted gene. This connection is important because the system is not limited to DNA maintenance; it converts a verified construct into a biological expression and viral-production system.
An experiment typically moves through four stages: insert the gene at attTn7 by transposon-mediated recombination, select and verify the construct in Escherichia coli, purify the recombinant bacmid, and introduce it into insect cells. Following this order preserves the distinction between bacterial construct preparation and insect-cell production of recombinant virus and gene product.
Researchers can use this platform for protein production, gene-function studies, vaccine development, and construction of complex genetic tools. These applications rely on the transition from an engineered, selectable DNA construct to insect-cell production and gene expression. The appropriate use therefore depends on whether the goal is manufacturing, functional analysis, or tool development.
In biology, the bacmid viral genome illustrates how genetic engineering can combine features from different biological systems. Bacterial artificial chromosome maintenance and selection support DNA manipulation in Escherichia coli, while the insect-cell phase supports recombinant baculovirus production and expression. This design connects cloning, viral genetics, and gene-expression studies within one experimental workflow.