Related Experiment Video
Updated: Jan 17, 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
Naiavirus: an enveloped giant virus with a pleomorphic, flexible tail
Matheus Rodrigues1, Victória Queiroz1,2, Thalita Arantes1
1Universidade Federal de Minas Gerais, Departamento de Microbiologia / Centro de Microscopia, Av. Antônio Carlos 6627, Belo Horizonte, Brazil.
Nature Communications
|September 17, 2025
Summary
Scientists discovered Naiavirus, a giant virus from Brazil, featuring unique morphology and a large genome. This finding expands our understanding of giant viruses and their ecological roles.
Area of Science:
- Virology
- Microbiology
- Ecology
Background:
- Viruses are crucial in Earth's environments, influencing biogeochemical cycles.
- Giant viruses infecting amoebae are notable for their large size and genomes.
Purpose of the Study:
- To describe a newly discovered giant virus, Naiavirus, from a Brazilian swamp biome.
- To characterize its unique morphology, composition, and genomic features.
Main Methods:
- Isolation and characterization of a novel giant virus from environmental samples.
- Morphological analysis using electron microscopy.
- Genomic sequencing and comparative analysis.
Main Results:
- Discovery of Naiavirus, one of the largest known tailed viruses (1350 nm).
- Naiavirus exhibits unprecedented morphology with an external envelope and flexible tail.
- Its nearly 1 million base pair genome contains unique genes, unlike any previously identified virus.
Conclusions:
- Naiavirus represents a novel lineage of giant amoeba viruses.
- Its unique characteristics offer new insights into viral evolution and diversity.
- The discovery underscores the unexplored viral diversity in environmental biomes.
Related Concept Videos
00:56Viral Structure
73.8K
Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid.
73.8K
01:29Viruses of Archaea
464
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...
464
01:29Viruses with RNA Genomes
833
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...
833
01:26Size and Structure of Viral Genomes
703
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...
703
01:28Introduction to Virus
1.2K
Viruses are unique biological entities that blur the boundary between living and non-living systems. Although they lack cellular structure and metabolic processes, they can exhibit characteristics of life when infecting a host. Their defining feature is a nucleic acid core, composed of either DNA or RNA, encapsulated within a protein coat called a capsid. This simple structure allows them to invade host cells and use their machinery for replication efficiently.Viral Structure and...
1.2K
01:10Intracellular Movement of Viruses and Bacteria
3.4K
Intracellular bacteria and viruses often comprise a group of highly infectious pathogens that can cause several diseases. Bacterial pathogens include those belonging to the genus Rickettsia responsible for conditions such as rocky mountain spotted fever and the Mediterranean spotted fever; Chlamydia, a genus responsible for a sexually transmitted disease; Coxiella burnetii, an agent responsible for Q fever. Viral pathogens include vaccinia—a poxvirus, and herpes simplex virus—a...
3.4K