Related Experiment Video
Updated: Jan 12, 2026
09:50
Single Cell Micro-aspiration as an Alternative Strategy to Fluorescence-activated Cell Sorting for Giant Virus Mixture Separation
Published on: October 27, 2019
7.5K
The cryptic diversity of hepadnavirus relatives
1College of Life Sciences, Nanjing Normal University, Nanjing, Jiangsu, China.
Mbio
|November 4, 2025
Summary
Researchers discovered 31 new proto-nackednaviruses (PnNVs), primarily in rotifers. This finding expands the known diversity of these DNA viruses and suggests rotifers as likely hosts, offering insights into viral evolution.
Area of Science:
- Virology
- Molecular Biology
- Evolutionary Biology
Background:
- Proto-nackednaviruses are closely related to hepadnaviruses, important human pathogens.
- The host range and diversity of proto-nackednaviruses are largely unknown.
- Understanding proto-nackednaviruses is crucial for the evolution of reverse-transcribing DNA viruses.
Purpose of the Study:
- To discover and characterize novel proto-nackednaviruses.
- To investigate the host range and diversity of proto-nackednaviruses.
- To elucidate the evolutionary history of reverse-transcribing DNA viruses.
Main Methods:
- Deep genome-scale data mining for viral discovery.
- Phylogenetic analyses to determine evolutionary relationships.
- Bioinformatic analysis of viral genomes.
Main Results:
- Discovery of 31 new proto-nackednaviruses (PnNVs).
- PnNVs predominantly found in rotifer species, suggesting a host association.
- Phylogenetic analysis revealed at least five paraphyletic lineages of PnNVs.
- The origin of the order Blubervirales was traced back to 476 million years ago.
Conclusions:
- Proto-nackednaviruses exhibit greater diversity than previously known.
- Rotifers are likely hosts for many PnNVs.
- This study enhances understanding of the origin, evolution, and diversity of reverse-transcribing DNA viruses.
Related Concept Videos
01:29Viruses of Archaea
442
Archaeal viruses play a crucial role in the ecosystems of extremophilic archaea, particularly those belonging to the phyla Euryarchaeota and Crenarchaeota. By shaping host evolution and facilitating gene transfer, these viruses influence microbial communities and contribute to genetic diversity in extreme environments. The archaea they infect thrive in acidic hot springs and hydrothermal vents characterized by high temperatures and low pH. Archaeal viruses exhibit remarkable structural...
442
01:29Viruses with RNA Genomes
783
RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
783
02:33Retroviruses
14.6K
Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
14.6K
01:26Size and Structure of Viral Genomes
654
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...
654
01:29Subviral Agents
492
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...
492
00:36Viral Mutations
39.6K
A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...
39.6K