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Confocal Imaging of Double-Stranded RNA and Pattern Recognition Receptors in Negative-Sense RNA Virus Infection
Published on: January 26, 2019
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Reduced Nucleoprotein Availability Impairs Negative-Sense RNA Virus Replication and Promotes Host Recognition
Benjamin E Nilsson-Payant1,2, Daniel Blanco-Melo1,2, Skyler Uhl1,2
1Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York, New York, USA.
Journal of Virology
|February 11, 2021
Summary
Targeting nucleoprotein (NP) in negative-sense RNA viruses (NSVs) severely impairs genome replication and enhances host antiviral responses. Insufficient NP levels lead to aberrant replication products, boosting immune recognition and antiviral defenses across various NSVs.
Area of Science:
- Virology
- Immunology
- Molecular Biology
Background:
- Negative-sense RNA viruses (NSVs) require viral RNA-dependent RNA polymerases (RdRp) and nucleoproteins (NP) for genome replication and transcription.
- The precise role of NSV NP in maintaining and protecting viral genetic material remains largely unknown.
- NSVs form ribonucleoprotein complexes to shield their genomes and regulate replication, balancing viral propagation with host immune evasion.
Purpose of the Study:
- To investigate the impact of targeting nucleoprotein (NP) on negative-sense RNA virus (NSV) genome replication and host antiviral responses.
- To determine if NP's role in genome protection is conserved across different NSVs.
- To explore novel antiviral strategies by manipulating NP levels.
Main Methods:
- Utilized host microRNA expression to specifically target the nucleoprotein (NP) of influenza A virus and Sendai virus.
- Assessed the effects of NP reduction on viral genome replication levels.
- Analyzed the host antiviral response in the presence and absence of sufficient NP levels.
- Examined the nature of replication products formed with insufficient NP.
Main Results:
- Targeting NP drastically decreased genome replication for influenza A and Sendai viruses.
- The absence of sufficient NP significantly enhanced the antiviral host response.
- Insufficient NP levels prevented the processing of full-length genomes, leading to aberrant replication products.
- These aberrant products acted as pathogen-associated molecular patterns, triggering immune recognition via cellular pattern recognition receptors.
- The observed effects of limiting NP were consistent across various NSVs, including Ebola, Lassa, and measles viruses.
Conclusions:
- Nucleoprotein (NP) plays a critical role in negative-sense RNA virus (NSV) genome replication and immune evasion.
- Manipulating NP levels can disrupt viral replication and enhance host antiviral immunity.
- This research offers new insights into NSV replication mechanisms and suggests potential antiviral strategies, including vaccine development.
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