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Related Concept Videos

Size and Structure of Viral Genomes01:26

Size and Structure of Viral Genomes

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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 with RNA Genomes01:29

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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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Introduction to Virus01:28

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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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Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the...
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Viral Mutations00:36

Viral Mutations

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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...
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Viral Structure00:56

Viral Structure

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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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Isolation and Genome Analysis of Single Virions using 'Single Virus Genomics'
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Virus genomics: what is being overlooked?

Kristopher Kieft1, Karthik Anantharaman2

  • 1Department of Bacteriology, University of Wisconsin-Madison, Madison, WI, USA; Microbiology Doctoral Training Program, University of Wisconsin-Madison, Madison, WI, USA.

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Virus genomics analysis faces bottlenecks due to data expansion and outdated methods. Revising current standards is crucial for fully understanding viral capabilities and the virosphere.

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Area of Science:

  • Virology
  • Genomics
  • Bioinformatics

Background:

  • Viruses are diverse biological entities significantly impacting all life forms.
  • Virus genomics has advanced, but data analysis now lags behind data generation.
  • Metagenomic sequencing generates vast amounts of viral data.

Purpose of the Study:

  • To review current conventions and ideologies in virus genomics.
  • To identify overlooked aspects of viral genomes and features.
  • To highlight the need for revised bioinformatics methods and databases.

Main Methods:

  • Review of recent innovations in virus genomics and metagenomic sequencing.
  • Analysis of current bioinformatics tools and database limitations.
  • Discussion of software-based virus genome prediction interpretation.

Main Results:

  • The bottleneck in virosphere discovery is genome analysis, not generation.
  • Vital viral genome components and features are frequently overlooked.
  • Existing databases and bioinformatics methods are lagging behind data generation.

Conclusions:

  • Current standards in virus genomics interpretation need revision.
  • Advancements in bioinformatics are essential for future discoveries.
  • A critical re-evaluation of methodologies is required to fully explore the virosphere.