Emergence and evolution of virulence in human pathogenic fungi

Sofía Siscar-Lewin1, Bernhard Hube2, Sascha Brunke1

  • 1Department of Microbial Pathogenicity Mechanisms, Hans Knoell Institute, Jena, Germany.

Trends in Microbiology
|January 21, 2022
PubMed

Insights

Fungal infections impact a billion people globally each year. This review explores how fungi evolve to cause disease, focusing on virulence factors and pathogen persistence.

Area of Science:

  • Medical Mycology
  • Evolutionary Biology
  • Pathogenomics

Background:

  • Fungal pathogens affect one billion people globally, causing 1.6 million deaths annually.
  • Human fungal infections arise from opportunistic commensals and environmental fungi.
  • Understanding fungal pathogenesis is crucial due to its significant public health impact.

Purpose of the Study:

  • To review the emergence and evolution of fungal pathogenesis in humans.
  • To explore attributes contributing to fungal pathogen success and virulence factor evolution.
  • To introduce concepts of antivirulence and avirulence genes in human fungal pathogens.

Main Methods:

  • Literature review of fungal pathogenesis, evolution, and virulence factors.
  • Analysis of established concepts from bacterial and plant pathogenic fungi.
  • Exploration of genetic factors influencing fungal pathogenicity.

Main Results:

  • Fungi possess specific attributes enabling them to become successful human pathogens.
  • Evolutionary pressures may drive the selection of virulence factors in fungi.
  • Antivirulence and avirulence genes offer new perspectives on fungal pathogenicity.

Conclusions:

  • Understanding fungal evolution, including antivirulence, enhances knowledge of human fungal infections.
  • This framework aids in comprehending fungal pathogenicity from emergence to persistence.
  • Further research into fungal virulence and avirulence mechanisms is warranted.

Related Concept Videos

Infection01:20

Infection

When a pathogen enters the body and reproduces, it can cause an infection, damage body cells, and cause illness symptoms that eventually lead to disease. Therefore, its prevention requires breaking the chain of infection.
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...
8.9K
Fungal Phylum Microsporidia01:28

Fungal Phylum Microsporidia

Microsporidia are a group of obligate intracellular fungi that were initially classified as protists but were later reclassified based on phylogenetic, molecular, and structural evidence linking them to the Chytridiomycota. These unicellular, non-motile organisms are highly specialized parasites that infect a wide range of animal hosts, including humans. They have evolved extensive genomic and metabolic reductions, making them highly dependent on their hosts for survival.Morphology and Genomic...
158
Overview of Fungi01:29

Overview of Fungi

Fungi are a diverse group of eukaryotes more closely related to animals than other eukaryotes. Fungal cell walls comprise chitin, a polysaccharide that provides structural strength, and glucans, which contribute to flexibility and integrity. Other polysaccharides, such as mannans and galactosans, may supplement or replace chitin in some fungi. These adaptations, along with their preference for acidic environments and tolerance for high osmotic pressure, enable fungi to thrive in various...
261
Viral Mutations00:36

Viral Mutations

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...
34.4K
Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
1.6K
Fungal Group Zygomycota01:29

Fungal Group Zygomycota

Zygomycota, previously classified as a distinct fungal group, are primarily terrestrial, saprophytic molds that play a crucial role as decomposers. Recent phylogenetic studies have revealed that these fungi are now divided into two major clades — Mucoromycota, which includes many symbiotic species, and Zoopagomycota, which primarily consists of parasitic and pathogenic fungi. These groups exhibit distinct ecological roles and reproductive strategies while sharing key structural and...
230