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Viral Structure00:56

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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.
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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...
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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...
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Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
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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...
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Virion aggregation shapes infection dynamics and evolutionary potential.

Meher Sethi1, David VanInsberghe1, Bernardo A Mainou2

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Viruses spreading in groups, or aggregates, reduce infectivity but boost genetic diversity. This study shows viral aggregation enhances reassortment, increasing evolutionary potential.

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Area of Science:

  • Virology
  • Evolutionary Biology
  • Microbiology

Background:

  • Viral spread is traditionally viewed as single-particle transmission.
  • Viruses can also spread collectively via aggregates, vesicles, or bacterial associations.
  • The impact of collective dispersal on viral infectivity and evolution is not fully understood.

Purpose of the Study:

  • To investigate the effect of viral aggregation on infection propagation.
  • To determine how aggregation influences viral diversity and genetic reassortment.
  • To evaluate the implications of collective dispersal for viral evolution.

Main Methods:

  • Mammalian orthoreovirus was used as a model system.
  • Viral aggregation was induced by altering pH and ionic conditions.
  • Infectivity, viral yields, and genetic reassortment frequencies were measured.

Main Results:

  • Aggregation promoted coordinated viral delivery, increasing virions per cell and per endosome.
  • Overall infectivity and progeny virus yields were reduced by aggregation.
  • Aggregation increased the frequency of mixed infections and genetic exchange (reassortment).

Conclusions:

  • Collective dispersal of mammalian orthoreovirus lowers population replicative potential.
  • Viral aggregation enhances evolutionary potential by promoting genetic diversification through reassortment.