Discovery of the First Insect Nidovirus
Author Information
Author(s): Nga Phan Thi, Parquet Maria del Carmen, Lauber Chris, Parida Manmohan, Nabeshima Takeshi, Yu Fuxun, Thuy Nguyen Thanh, Inoue Shingo, Ito Takashi, Okamoto Kenta, Ichinose Akitoyo, Snijder Eric J., Morita Kouichi, Gorbalenya Alexander E.
Primary Institution: National Institute of Hygiene and Epidemiology, Hanoi, Vietnam
Hypothesis
The acquisition of a 3′-5′ exoribonuclease (ExoN) may have facilitated the emergence of large RNA virus genomes.
Conclusion
The study identifies the Nam Dinh virus (NDiV) as a new insect-borne nidovirus that serves as a missing evolutionary link between small and large nidoviruses.
Supporting Evidence
- NDiV has a genome size of 20,192 nucleotides, making it the largest known genome among insect viruses.
- Phylogenetic analysis shows that NDiV clusters with roniviruses, indicating its evolutionary significance.
- The study provides evidence for the role of ExoN in controlling RNA replication fidelity in large nidoviruses.
Takeaway
Scientists found a new virus in mosquitoes that helps explain how some viruses can have very large genomes.
Methodology
The researchers conducted a field study in Vietnam, collecting mosquito pools and testing for viruses using cell culture and molecular techniques.
Limitations
The clinical relevance of NDiV remains unknown, and it has only been isolated from mosquitoes.
Participant Demographics
Mosquitoes collected from various provinces in Vietnam.
Digital Object Identifier (DOI)
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