Related Experiment Video

Updated: May 27, 2026

Forward Genetics Screens Using Macrophages to Identify Toxoplasma gondii Genes Important for Resistance to IFN-γ-Dependent Cell Autonomous Immunity
11:21

Forward Genetics Screens Using Macrophages to Identify Toxoplasma gondii Genes Important for Resistance to IFN-γ-Dependent Cell Autonomous Immunity

Published on: March 12, 2015

Histoplasma mechanisms of pathogenesis--one portfolio doesn't fit all

Jessica A Edwards1, Chad A Rappleye

  • 1Department of Microbiology, The Center for Microbial Interface Biology, Ohio State University, Columbus, OH 43210, USA.

FEMS Microbiology Letters
|November 19, 2011
PubMed

Insights

Histoplasma capsulatum, a fungal pathogen, exhibits significant diversity among its strains. Understanding these genetic differences is crucial for identifying virulence factors and combating endemic mycosis effectively.

Area of Science:

  • Mycology
  • Infectious Diseases
  • Molecular Biology

Background:

  • Histoplasma capsulatum is a globally prevalent fungal pathogen causing endemic mycosis.
  • Clinical isolates display considerable diversity, impacting disease presentation and treatment.
  • Previous research has identified distinct molecular profiles in different Histoplasma strains.

Purpose of the Study:

  • To investigate the genetic and molecular diversity within Histoplasma capsulatum.
  • To compare representative strains from different geographical regions and chemotypes.
  • To understand the functional consequences of observed variations on Histoplasma pathogenesis.

Main Methods:

  • Comparative molecular analysis of clinical isolates.
  • Genetic and structural characterization of Histoplasma strains.
  • Functional assays to assess virulence factor differences.

Main Results:

  • Significant genetic, structural, and molecular differences were identified between the Chemotype I NAm2 strain (G217B) and the Chemotype II Panamanian strain (G186A).
  • Observed variations have functional implications, revealing distinct molecular mechanisms contributing to pathogenesis.
  • Strain diversity impacts the expression and function of key virulence factors.

Conclusions:

  • Histoplasma capsulatum strain diversity is a critical factor in understanding fungal pathogenesis.
  • Characterizing virulence factors within specific clinical isolates is essential for effective disease management.
  • Further research into strain-specific mechanisms will improve diagnostic and therapeutic strategies for histoplasmosis.

More Related Videos

QTL Mapping and CRISPR/Cas9 Editing to Identify a Drug Resistance Gene in Toxoplasma gondii11:37

QTL Mapping and CRISPR/Cas9 Editing to Identify a Drug Resistance Gene in Toxoplasma gondii

Published on: June 22, 2017

Passive Administration of Monoclonal Antibodies Against H. capsulatum and Others Fungal Pathogens09:57

Passive Administration of Monoclonal Antibodies Against H. capsulatum and Others Fungal Pathogens

Published on: February 14, 2011

Related Concept Videos

Diversity of Protists II01:27

Diversity of Protists II

Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
Colonisation of Pathogens01:25

Colonisation of Pathogens

Pathogen colonization of host tissues is a critical step in the development of infectious diseases. Various pathogenic microorganisms, including bacteria, fungi, viruses, and protozoa, have evolved complex strategies to attach to, invade, and persist within host environments. These mechanisms enable pathogens to establish infections, evade immune responses, and resist antimicrobial treatments.Attachment to Host CellsIn bacteria, colonization typically begins with adherence to host epithelial...
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...
Microbial Interactions: Parasitism01:22

Microbial Interactions: Parasitism

Parasitism is a form of microbial interaction in which parasitic microbes exploit a host organism for nutrients and shelter, often at the host's expense. Unlike mutualistic relationships, where both organisms benefit, parasitism benefits only the parasite and harms the host.Classification of ParasitesMicrobial parasites are broadly classified based on their location relative to the host.Ectoparasites remain on the host’s surface, such as the skin or outer tissues, drawing nutrients...
Encephalitis ll: Pathophysiology01:26

Encephalitis ll: Pathophysiology

Encephalitis is inflammation of the brain parenchyma caused by direct viral invasion or immune-mediated mechanisms triggered by infections or tumors. Both processes lead to neuronal injury, disrupted neurotransmission, and diverse neurological symptoms, often with overlapping clinical and pathological features.Autoimmune EncephalitisIn autoimmune encephalitis, antibodies target neuronal antigens on cell surfaces, synapses, or within neurons. A key example is anti-NMDAR encephalitis, which can...
Atypical Pneumonia01:14

Atypical Pneumonia

Atypical pneumonia, often caused by Mycoplasma pneumoniae, is a form of pulmonary infection that differs from the classical presentation of bacterial pneumonia in both its cause and clinical symptoms. Mycoplasma pneumoniae is a pleomorphic bacterium notable for its lack of a rigid cell wall. This structural characteristic imparts resistance to beta-lactam antibiotics and significantly influences the bacterium’s behavior within the human host.Other pathogens responsible for the disease include...