Related Experiment Video
Updated: Jun 17, 2026
09:29
Early Viral Entry Assays for the Identification and Evaluation of Antiviral Compounds
Published on: October 29, 2015
Defective interfering viruses and their potential as antiviral agents
1Department of Biological Sciences, University of Warwick, Coventry CV4 7AL, UK. a.c.marriott@warwick.ac.uk
Reviews in Medical Virology
|December 31, 2009
Summary
Defective interfering (DI) viruses are naturally occurring viral mutants with deleted genomes. These DI viruses can suppress helper virus production and show potential as novel antiviral agents.
Area of Science:
- Virology
- Molecular Biology
- Immunology
Background:
- Defective interfering (DI) viruses are spontaneously generated viral mutants.
- DI viruses possess deletions in critical viral genome portions, rendering essential genes non-functional.
- DI virus replication necessitates a complete, functional viral genome for providing missing functions.
Purpose of the Study:
- To review the fundamental properties of DI viruses.
- To explore the potential mechanisms underlying viral interference mediated by DI viruses.
- To discuss the advancements in utilizing DI viruses, particularly those from influenza A virus, as antiviral agents.
Main Methods:
- Literature review of existing research on DI viruses.
- Analysis of viral interference mechanisms.
- Evaluation of DI virus applications in antiviral therapy.
Main Results:
- DI viruses are characterized by genomic deletions and dependence on helper viruses for replication.
- DI viruses exhibit interference, suppressing helper virus production in co-infected cells.
- Observed attenuation of disease in animals infected with DI viruses.
Conclusions:
- DI viruses possess unique properties making them valuable research tools.
- DI viruses demonstrate significant potential as a novel class of antiviral agents.
- Further research into influenza A virus-derived DI viruses could lead to new therapeutic strategies.
Related Concept Videos
01:30Inhibitors of Viral Protein Synthesis
Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...
01:22Antiviral Nucleoside Inhibitors
Antiviral Nucleoside InhibitorsAntiviral nucleoside inhibitors are structural analogs of natural nucleosides that interfere with viral DNA or RNA synthesis. These compounds selectively target viral polymerases due to their resemblance to host nucleosides, thereby disrupting viral genome replication.Mechanism of Acyclovir ActionAcyclovir is a guanosine analog with a three-carbon acyclic side chain. It selectively targets herpes simplex virus type 1 (HSV-1), herpes simplex virus type 2 (HSV-2),...
01:19Inhibitors of Virion Maturation and Assembly
As part of their replication cycle, certain viruses synthesize long precursor proteins called polyproteins within infected host cells. In human immunodeficiency virus (HIV), two major polyproteins are produced: Gag and Gag-Pol. The Gag polyprotein supplies the structural components of the virus, while Gag-Pol includes essential viral enzymes such as reverse transcriptase, integrase, and protease. After synthesis, these polyproteins move to the host cell membrane, where they assemble into an...
01:25Inhibitors Of Virion Release
Viral replication and dissemination rely on efficient mechanisms for host cell entry, genome replication, assembly, and release. Influenza viruses, such as types A and B, are negative-sense single-stranded RNA viruses with a segmented genome, that depend on two critical surface glycoproteins to carry out these processes: hemagglutinin (HA) and neuraminidase (NA). HA initiates infection by binding to sialic acid residues on the surface of host epithelial cells, facilitating receptor-mediated...
01:29Subviral Agents
Subviral agents are infectious entities that resemble viruses but lack one or more viral components, such as a capsid or essential replication machinery. These agents include viroids, prions, and satellites, each possessing distinct structural and functional characteristics that influence their mode of infection and replication.Viroids are the simplest subviral agents, consisting of circular, single-stranded RNA molecules without a protein coat. They exclusively infect plants, relying entirely...
01:29Immune Response Against Viral Pathogens
The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...