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Introduction to Virus01:28

Introduction to Virus

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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 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’...
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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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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...
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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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The First "Virus Hunters".

Thomas C Mettenleiter1

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Virology

Keywords:
First virus huntersFriedrich LoefflerFriedrich-Loeffler-InstitutHistory of virology

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Area of Science:

  • Virology
  • Microbiology
  • Infectious Diseases

Background:

  • The history of virology is marked by significant conceptual and technological advancements.
  • Early breakthroughs involved the development of filters capable of retaining bacteria, enabling the study of smaller, non-cultivable infectious agents.

Observation:

  • The discovery of filterable, ultravisible agents led to the identification of viruses infecting plants and animals.
  • Experimental infections in natural hosts confirmed these agents as causative agents of disease.

Findings:

  • The identification of viruses expanded with the discovery of bacteriophages (viruses infecting bacteria).
  • Technological leaps, including electron microscopy and cell culture, revolutionized virus detection and propagation.
  • Molecular biology techniques, such as next-generation sequencing and metagenomics, enable rapid and deep analysis of viral genomes.

Implications:

  • The ongoing discovery of novel viruses, including those of unprecedented size and shape, highlights the vastness of the unexplored viral universe.
  • Continued exploration is crucial for understanding viral diversity and their impact on health and ecosystems.