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Published on: June 19, 2013
Genotypic diversity, virulence, and molecular genetic tools in Histoplasma
Victoria E Sepúlveda1, William E Goldman2, Daniel R Matute1
1Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
Abstract:
SUMMARYHistoplasmosis is arguably the most common fungal respiratory infection worldwide, with hundreds of thousands of new infections occurring annually in the United States alone. The infection can progress in the lung or disseminate to visceral organs and can be difficult to treat with antifungal drugs. Histoplasma, the causative agent of the disease, is a pathogenic fungus that causes life-threatening lung infections and is globally distributed. The fungus has the ability to germinate from conidia into either hyphal (mold) or yeast form, depending on the environmental temperature. This transition also regulates virulence. Histoplasma and histoplasmosis have been classified as being of emergent importance, and in 2022, the World Health Organization included Histoplasma as 1 of the 19 most concerning human fungal pathogens. In this review, we synthesize the current understanding of the ecological niche, evolutionary history, and virulence strategies of Histoplasma. We also describe general patterns of the symptomatology and epidemiology of histoplasmosis. We underscore areas where research is sorely needed and highlight research avenues that have been productive.
Insights
Histoplasmosis, a common fungal respiratory infection caused by Histoplasma, can be severe and difficult to treat. This review synthesizes current knowledge on Histoplasma, its virulence, and disease epidemiology, highlighting research needs.
Area of Science:
- Medical Mycology
- Infectious Diseases
- Public Health
Background:
- Histoplasmosis is a globally prevalent fungal respiratory infection caused by *Histoplasma*.
- The fungus can cause severe lung infections and disseminate to visceral organs, posing treatment challenges.
- *Histoplasma* is recognized as an emergent pathogen of global concern, listed by the World Health Organization.
Purpose of the Study:
- To synthesize current understanding of *Histoplasma*'s ecology, evolution, and virulence.
- To review the symptomatology and epidemiology of histoplasmosis.
- To identify critical research gaps and productive research avenues.
Main Methods:
- Literature review and synthesis of existing research on *Histoplasma* and histoplasmosis.
- Analysis of ecological niche, evolutionary history, and virulence factors.
- Examination of clinical presentation and epidemiological patterns.
Main Results:
- *Histoplasma* transitions between hyphal and yeast forms, regulating virulence based on temperature.
- The review consolidates information on disease manifestations and global distribution.
- Key areas for future research and promising avenues are identified.
Conclusions:
- A comprehensive understanding of *Histoplasma* biology and pathogenesis is crucial for combating histoplasmosis.
- Targeted research is needed to address treatment challenges and public health impact.
- Continued investigation into virulence strategies and epidemiology will improve disease management.
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