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Related Concept Videos

Viruses with RNA Genomes01:29

Viruses with RNA Genomes

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...
Size and Structure of Viral Genomes01:26

Size and Structure of Viral Genomes

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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Immune Response Against Viral Pathogens

The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
Inhibitors of Viral Protein Synthesis01:30

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Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...
Viral Structure00:56

Viral Structure

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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Introduction to Virus

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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Arbovirus Infections As Screening Tools for the Identification of Viral Immunomodulators and Host Antiviral Factors
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Arbovirus Infections As Screening Tools for the Identification of Viral Immunomodulators and Host Antiviral Factors

Published on: September 13, 2018

RNA-based mechanisms regulating host-virus interactions.

Rui Zhou1, Tariq M Rana

  • 1Program for RNA Biology, Sanford-Burnham Medical Research Institute, La Jolla, CA 92037, USA.

Immunological Reviews
|April 5, 2013
PubMed
Summary
This summary is machine-generated.

RNA interference (RNAi) uses small RNAs to regulate genes. This ancient defense mechanism targets viruses and transposons, offering precise gene silencing.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • RNA interference (RNAi) is a conserved biological process involving small non-coding RNAs.
  • Small regulatory RNAs, including small interfering RNAs (siRNAs) and microRNAs (miRNAs), are key components of RNAi.
  • Significant advancements have been made in understanding siRNA and miRNA biogenesis over the last two decades.

Purpose of the Study:

  • To review the molecular mechanisms of small interfering RNA (siRNA) and microRNA (miRNA) biogenesis.
  • To highlight the regulatory roles of small RNAs in various biological processes.
  • To explore the evolutionary origins of RNAi as a host defense mechanism.

Main Methods:

  • Literature review of recent advances in RNAi research.
  • Analysis of molecular mechanisms governing small RNA biogenesis.
  • Examination of the role of small RNAs in host defense against viruses and transposons.

Main Results:

  • Small RNAs, particularly siRNAs and miRNAs, are crucial regulators of gene expression.
  • RNAi machinery recognizes viral RNA and transposon transcripts for sequence-specific silencing.
  • RNAi evolved as an ancient host defense mechanism, providing precise gene silencing.

Conclusions:

  • Small RNA pathways are fundamental to gene regulation, development, homeostasis, immunity, and disease.
  • RNAi's specificity and precision make it an effective antiviral mechanism.
  • Understanding RNAi mechanisms is critical for unraveling complex biological processes.