Related Experiment Video
Updated: Jun 12, 2026
12:43
Monitoring Activation of the Antiviral Pattern Recognition Receptors RIG-I And PKR By Limited Protease Digestion and Native PAGE
Published on: July 29, 2014
Activation of host pattern recognition receptors by viruses
1School of Biochemistry & Immunology, Trinity College Dublin, Dublin 2, Ireland.
Current Opinion in Microbiology
|June 12, 2010
Summary
Host innate immunity detects viruses using pattern recognition receptors (PRRs). Novel mechanisms reveal how viral DNA sensing by RNA polymerase III (Pol III) and AIM2 triggers immune responses like interferon induction.
Area of Science:
- Immunology
- Virology
- Molecular Biology
Background:
- Innate immune system recognizes viral threats through pattern recognition receptors (PRRs).
- PRR families like Toll-like receptors (TLRs), RIG-I-like receptors (RLRs), and NOD-like receptors (NLRs) detect viral components.
- The precise mechanisms of viral DNA sensing within host cells are still being elucidated.
Purpose of the Study:
- To explore novel pathways for viral DNA recognition by the host innate immune system.
- To understand the roles of RNA polymerase III (Pol III) and AIM2 in sensing viral DNA.
- To investigate the downstream consequences of viral DNA detection on immune signaling.
Main Methods:
- Investigated the role of RNA polymerase III (Pol III) in transcribing viral DNA into RNA.
- Examined the function of the PYHIN family member AIM2 in viral DNA sensing.
- Analyzed the induction of cytokines and type I interferons (IFNs) following viral DNA detection.
Main Results:
- RNA polymerase III (Pol III) was found to transcribe viral DNA into RNA, enabling detection by RIG-I.
- This RIG-I mediated sensing leads to the induction of type I interferons (IFNs).
- AIM2 was identified as a key sensor for viral DNA, triggering proinflammatory cytokine production.
Conclusions:
- Viral DNA can be recognized through RNA intermediates transcribed by Pol III, activating RIG-I.
- AIM2 represents a distinct pathway for sensing viral DNA, leading to inflammatory responses.
- These findings expand our understanding of host-pathogen interactions and innate antiviral immunity.
Related Concept Videos
01:29Immune 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...
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...
00:56Viral 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.
01:28Cells of the Innate Immune Response
The innate immune response is an immediate and non-specific response against pathogens, acting swiftly to prevent the spread of infections. The primary cells involved in this response are phagocytes and natural killer (NK) cells.
Phagocytes
Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...
Phagocytes
Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...
01:23The 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.
01:10Retrovirus Life Cycles
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 retrovirus to...
02:33Retroviruses
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’...