Thermally Dimorphic Human Fungal Pathogens--Polyphyletic Pathogens with a Convergent Pathogenicity Trait.
Fungi are adept at changing their cell shape and developmental program in response to signals in their surroundings. Here we focus on a group of evolutionarily related fungal pathogens of humans known as the thermally dimorphic fungi. These organisms grow in a hyphal form in the environment but shift their morphology drastically within a mammalian host. Temperature is one of the main host signals that initiates their conversion to the "host" form and is sufficient in the laboratory to trigger establishment of this host-adapted developmental program. Here we discuss the major human pathogens in this group, which are Blastomyces dermatiditis, Coccidioides immitis/posadasii, Histoplasma capsulatum, Paracoccidioides brasiliensis/lutzii, Sporothrix schenckii, and Talaromyces marneffei (formerly known as Penicillium marneffei). The majority of these organisms are primary pathogens, with the ability to cause disease in healthy humans who encounter them in endemic areas.
Department of Microbiology and Immunology, University of California, San Francisco, California 94143 sil@cgl.ucsf.edu.
Anita
A
Sil
Department of Genetics, The University of Melbourne, Victoria 3010, Australia.
Alex
A
Andrianopoulos
D000222:Adaptation, Physiological; D001758:Blastomyces / Q000472:pathogenicity / Q000502:physiology; D003045:Coccidioides / Q000472:pathogenicity / Q000502:physiology; D005260:Female; D005658:Fungi / Q000145:classification / Q000472:pathogenicity* / Q000502:physiology; D006658:Histoplasma / Q000472:pathogenicity / Q000502:physiology; D054884:Host-Pathogen Interactions; D006801:Humans; D008297:Male; D009181:Mycoses / Q000382:microbiology* / Q000503:physiopathology; D018570:Risk Assessment; D013696:Temperature; D037521:Virulence Factors
D037521:Virulence Factors