Trichosporon

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Trichosporon
A typical case of severe dandruff and dry scalp
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Fungi
Division: Basidiomycota
Class: Tremellomycetes
Order: Trichosporonales
Family: Trichosporonaceae
Genus: Trichosporon
Behrend (1890)
Type species
Trichosporon beigelii
(Küchenm. & Rabenh.) Vuill.


Trichosporon is a

immunocompromised
individuals.

Taxonomy

The genus was first described by the German

alga and placed it in the genus Pleurococcus as Pleurococcus beigelii. The French mycologist Vuillemin later realized it was a yeast
and transferred it to the genus Trichosporon, considering it to be an earlier name for Trichosporon ovoides.

Over 100 additional yeast species were referred to Trichosporon by later authors.

cladistic analysis of DNA sequences, 12 species are now accepted in the genus.[3]

DNA sequencing has also shown that white piedra can be caused by more than one Trichoporon species. As a result, Trichosporon beigelii has become a name of uncertain application. McPartland & Goff selected a neotype strain that makes T. beigelii synonymous with Cutaneotrichosporon cutaneum.[4][5] Guého and others, however, have argued that T. beigelii should be discarded (as a dubious name) and Behrend's original T. ovoides (for which a neotype strain has also been selected) should become the type.[1] As a result of this uncertainty, the name T. beigelii is now obsolete.[6]

Description and habitat

Trichosporon species are distinguished microscopically by having yeast cells that germinate to produce hyaline

teleomorphic
(sexual) states are known.

Species of Trichosporon and related genera are widespread and have been isolated from a wide range of substrates, including human hair (Trichosporon ovoides), soil (Cutaneotrichosporon guehoae),

sea water (Cutaneotrichosporon dermatis).[7]

Human pathogens

Several Trichosporon species occur naturally as part of the microbiota of human skin. Occasionally, particularly in circumstances of high humidity, the fungus can proliferate, causing an unpleasant but harmless hair condition known as white piedra. Soft, pale nodules containing yeast cells and arthroconidia form on hairs of the scalp and body. The species responsible include Trichosporon ovoides, T. inkin,[8] T. asahii, Cutaneotrichosporon mucoides, T. asteroides, and Cutaneotrichosporon cutaneum. The obsolete name T. beigelii was formerly applied to all or any of these species.[9]

Much more serious

immunocompromised individuals. Species said to be agents of trichosporonosis are T. asahii, T. asteroides, Cutaneotrichosporon cutaneum, Cutaneotrichosporon dermatis, T. dohaense, T. inkin, Apiotrichum loubieri, Cutaneotrichosporon mucoides, and T. ovoides.[10][11][12]

Species

References

  1. ^
    S2CID 43889990
    .
  2. ^ "Genus Record Details-Trichosporon". Index Fungorum. CAB International. Retrieved 2010-04-30.
  3. PMID 26955199
    .
  4. ^ McPartland, JM; Goff, JP (1991). "Neotypification of Trichosporon beigelii: morphological, pathological and taxonomic considerations". Mycotaxon. 41: 173–178. INIST 5366626.
  5. ^ http://www.cbs.knaw.nl/Yeast/BioloMICS.aspx?Link=T&DB=0&Table=0&Descr=CBS%202466&Fields=All&ExactMatch=T[permanent dead link][full citation needed]
  6. ^ Mycology Online: Trichosporon asahii "Mould Identification: A Virtual Self Assessment | Mycology Online". Archived from the original on February 12, 2010. Retrieved May 1, 2010.[full citation needed]
  7. PMID 15143052
    .
  8. PMID 19148418
    .
  9. ^ Piedra at eMedicine
  10. PMID 9574732
    .
  11. PMID 14605194
    .
  12. PMID 19321719
    .

External links
Retrieved from "https://en.wikipedia.org/w/index.php?title=Trichosporon&oldid=1193717794"