Evolution: Decoy Receptors as Unique Weapons to Fight Pathogens.
1Tumor Immunology Laboratory, LIFE Center, Ludwig-Maximilians-University of Munich, 81377 Munich, Germany.
Current Biology : CB
|February 20, 2019
Summary
Pathogens target host cells by binding to entry receptors, but must evade decoy receptors on immune cells. Discoveries in human populations reveal genetic variations in these decoy receptors, indicating an evolutionary arms race between hosts and pathogens.
Area of Science:
- Immunology
- Evolutionary Biology
- Microbial Pathogenesis
Background:
- Pathogens frequently utilize host cell surface receptors for entry into host organisms.
- Host defense mechanisms have evolved, including decoy receptors on granulocytes, to trap pathogens.
- These decoy receptors are closely related to pathogen entry receptors, presenting an evolutionary challenge.
Purpose of the Study:
- To investigate the evolutionary dynamics between pathogens and host defense decoy receptors.
- To understand the role of decoy-receptor polymorphisms in human populations.
- To elucidate the host's adaptive strategies against pathogen evasion.
Main Methods:
- Analysis of pathogen binding mechanisms to host cell receptors.
- Identification and characterization of decoy receptors on granulocytes.
- Population genetics studies to assess decoy-receptor polymorphisms in humans.
Main Results:
- Pathogens exhibit specific binding affinities for host entry receptors.
- Decoy receptors on granulocytes effectively bind to certain pathogens, acting as a crucial defense.
- Significant polymorphisms in human decoy receptors were identified, suggesting recent evolutionary adaptation.
Conclusions:
- Decoy-receptor polymorphisms represent a host-driven evolutionary response to pathogen pressure.
- This evolutionary process allows human populations to adapt and counter pathogen evasion strategies.
- Understanding these polymorphisms is key to comprehending host-pathogen co-evolution.
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