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Related Concept Videos

Immune Response Against Viral Pathogens01:29

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...
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.
Diversity of Antigen Receptors01:28

Diversity of Antigen Receptors

Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
The Antiviral System of Bacteria and Archaea: CRISPR01:23

The Antiviral System of Bacteria and Archaea: CRISPR

CRISPR stands for Clustered Regularly Interspaced Short Palindromic Repeats is a adaptive immune system found in bacteria and archaea that protects against viral infections. This system enables prokaryotic cells to identify, remember, and neutralize foreign genetic elements, primarily bacteriophages, by storing fragments of the invader’s DNA as a genetic memory.The CRISPR immune response begins during an initial infection. Cas (CRISPR-associated) proteins play a central role in this defense.
Rapid Identification of Pathogens01:25

Rapid Identification of Pathogens

MALDI-TOF MS has transformed clinical microbiology by offering a rapid and reliable method for pathogen identification. The traditional approach to microbial identification typically involves time-consuming culture techniques and biochemical tests, which can delay the initiation of appropriate antimicrobial therapy. MALDI-TOF MS avoids these delays by using characteristic ribosomal protein mass patterns of microbial cells, enabling accurate species-level identification within minutes.Principle...
Viral Recombination00:57

Viral Recombination

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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Related Experiment Video

Updated: Jun 26, 2026

Confocal Imaging of Double-Stranded RNA and Pattern Recognition Receptors in Negative-Sense RNA Virus Infection
06:44

Confocal Imaging of Double-Stranded RNA and Pattern Recognition Receptors in Negative-Sense RNA Virus Infection

Published on: January 26, 2019

Viral sensors: diversity in pathogen recognition.

Stephen A McCartney1, Marco Colonna

  • 1Department of Pathology and Immunology, Washington University School of Medicine, St Louis, MO 63110, USA.

Immunological Reviews
|January 6, 2009
PubMed
Summary

Viral sensors, like Toll-like receptors and retinoic acid-inducible gene I-like receptors, detect viral nucleic acids to trigger antiviral responses. This review explores their diverse functions and potential in vivo roles.

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Last Updated: Jun 26, 2026

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Area of Science:

  • Immunology
  • Virology
  • Molecular Biology

Background:

  • Innate immunity relies on sensors to detect viral infections.
  • Toll-like receptors (TLRs) and retinoic acid-inducible gene I-like receptors (RLRs) are key viral sensors.
  • These sensors recognize viral nucleic acids, initiating antiviral signaling.

Purpose of the Study:

  • To review current knowledge on viral sensors.
  • To explore the in vivo functions of these sensors.
  • To discuss the diversity and potential redundancy of viral sensing mechanisms.

Main Methods:

  • Literature review of innate immune sensing pathways.
  • Analysis of known viral sensor families (TLRs, RLRs).
  • Speculative discussion on in vivo mechanisms and functional diversity.

Main Results:

  • Viral sensors recognize diverse nucleic acid patterns.
  • Activation of sensors leads to type I interferon and cytokine secretion.
  • The precise in vivo roles and functional specificity remain under investigation.

Conclusions:

  • Viral sensors exhibit diverse recognition capabilities.
  • Understanding sensor specificity is crucial for deciphering antiviral immunity.
  • Further research is needed to clarify sensor redundancy and unique functions in vivo.