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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...
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Skin is the first line of defense and encounters a variety of microbes. Some pathogenic strains are often the cause of a broad range of infections of the skin and other body systems. These conditions can affect people of all ages and may have different causes, including genetic factors, infections, autoimmune reactions, environmental factors, and lifestyle choices.
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Fungi that Infect Humans.

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Area of Science:

  • Medical Mycology
  • Pathogen Evolution
  • Fungal Pathogenesis

Background:

  • Fungi must meet four criteria for human infection: thermotolerance, barrier penetration, tissue lysis/absorption, and immune evasion.
  • Host immune systems co-evolved with fungi, limiting infections in healthy individuals.
  • Modern medicine, by compromising immune defenses, creates new opportunities for fungal pathogens.

Purpose of the Study:

  • To explore the diverse strategies employed by fungi across four phyla to meet the criteria for human infection.
  • To highlight unique traits that confer pathogenic potential in various fungal species.
  • To discuss the evolutionary interplay between hosts and fungi, including commensalism and parasitism.

Main Methods:

  • Review of fungal pathogenic mechanisms across four major phyla: Entomophthorales, Mucorales, Ascomycota, and Basidiomycota.
  • Examination of specific fungal genera and species with known human pathogenic potential.
  • Consideration of evolutionary pressures shaping fungal and host genomes and physiology.

Main Results:

  • Fungal pathogenesis involves strategies like morphogenesis for barrier traversal and enzyme secretion for nutrient acquisition.
  • Pathogenic fungi include thermal dimorphs (e.g., Histoplasma, Coccidioides), opportunistic pathogens (e.g., Cryptococcus, Candida, Aspergillus, Pneumocystis), and agents of neglected tropical diseases.
  • Fungal traits, from thermal dimorphism to immune evasion, are key to their success as human pathogens.

Conclusions:

  • Fungal infection is a complex interplay of fungal adaptation and host defenses.
  • Understanding fungal strategies is vital, especially with increasing host susceptibility due to medical interventions.
  • Evolutionary dynamics, including host-pathogen interactions, continue to shape fungal pathogenicity.