Trichosporon asteroides

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Trichosporon asteroides
Trichosporon asteroides culture.jpg
Scientific classification
Kingdom:
Fungi
Division:
Basidiomycota
Class:
Tremellomycetes
Order:
Trichosporonales
Genus:
Trichosporon
Species:
T. asteroides
Binomial name
Trichosporon asteroides
M. Ota (1926)
Synonyms
  • Parendomyces asteroides Rischin (1921)
  • Geotrichoides asteroides(Rischin) Langeron & Talice (1932)
  • Proteomyces asteroides(Rischin) C.W. Dodge (1935)
  • Prototheca filamentaP. Arnold & Ahearn (1972)
  • Fissuricella filamenta(P. Arnold & Ahearn) Pore, D'Amatao & Ajello (1977)

Trichosporon asteroides is an asexual basidiomycetous fungus first described from human skin but now mainly isolated from blood and urine. [1] [2] [3] [4] [5] T. asteroides is a hyphal fungus with a characteristically yeast-like appearance due to the presence of slimy arthroconidia. [3] [6] Infections by this species usually respond to treatment with azoles and amphotericin B. [2] [7] [8]

Contents

History and taxonomy

Trichosporon asteroides was isolated from lesion of male chin skin by Rinchin in Bern in 1926 and named in the genus, Parendomyces. T. asteroides was later reevaluated by Masao Ota and transferred to the genus Trichosporon as T. asteroides. [1] Ota noted that its hyphae were more sparsely branched than other species in Trichosporon, and it lacked the ability to ferment glucose, maltose, sucrose and fructose. [1] Molecular phylogenetic study has since supported the placement of T. asteroides in the genus Trichsporon. [9] T. asteroides was determined to be conspecific with Fissuricella filamenta on the basis of DNA/DNA reassociation. [3] [6] Modern classifications support the placement of this species within the order Trichosporonales. [10]

Growth and morphology

Trichosporon asteroides grows in a range of media including in the presence of the antifungal agent, cycloheximide. [4] Colonies of T. asteroides grown on Sabouraud agar appear white with a brain-like texture, reaching a diameter of 10 mm after 10 days growth at 25 °C (77 °F). [3] [6] Colonies have a radially furrowed outer zone and matt appearance that is not powdery like the related species, T. asahii. [3] Antibodies produced by infected patients can also be used to differentiate T. asahii and T. asteroides in disease. [11] Weak growth is seen at 37 °C (99 °F) but is absent at higher temperatures. [6] [12] T. asteroides can be distinguished from related Trichosporon species by its ability to utilize D-galactose, L-rhamnose, erythritol and L-arabinitol. [3]

Physiology and pathogenesis

Trichosporon asteroides does not ferment glucose, maltose, sucrose or fructose, a feature common to all Trichosporon species. [1] T. asteroides causes trichosporonosis, causing deep-seated, mucosa-associated, superficial, and systematic infections including blood. [2] [4] [6] [13] [14] This species is one of the three most common Trichosporon species isolated in clinical settings. [13] The fungus is sometimes recovered from specimens of blood, urine, and aspiration fluid, vaginal mucosa, male perigenital skin area, and catheters. [4] [15] [5] The first record of this agent in a systemic infection involved a bloodstream infection. [4] Main types of latent infection include fungemia, urinary tract infections, peritonitis, endocarditis, arthritis, esophagitis, meningitis, brain abscess, splenic abscess, and uterine infections. [2] Allergies and systemic infections can also be caused by this fungus particularly in immunosuppressed people. [16] Recently, T. asteroides was implicated in a case of kerion celsi, a rare, highly inflammatory scalp infection seen mainly in children. [17]

This fungus is rarely encountered in zoonotic infections [16] and has never been shown to cause disease in insects. [13] However, T. asteroides was isolated from multifocal, irregularly raised skin lesions on a female Bottle-Nosed Dolphin, Tursiops truncatus , in Japan. [16] In the absence of cultures and molecular biological analysis, the agent was initially suspected to be Paracoccidioides ceti, a worldwide causative agent of Paracoccidioidomycosis in dolphins. [16]

Treatment

Azole antifungals are often used as a front-line therapy in trichosporonosis. [7] Resistance to amphotericin, flucytosine, fluconazole, and itraconazole have been described. [8] [2] Echinocandins, as a group, are ineffective against Trichosporon species. [6] Triazoles show better in vitro and in vivo antifungal activity than amphotericin B, while voriconazole also has excellent in vitro activity against Trichosporon asteroides. [2] [8] [18] Combination therapy regimens such as voriconazole and amphotericin B are also effective in serious infections. [18] Fluconazole has been used successfully in subcutaneous and deep infections. [17]

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References

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  8. 1 2 3 Garg, Vaibhav; Jones, Elizabeth K.; Friedman, Ben J.; Lee, Jason B.; Yang, Sherry (2018). "Invasive trichosporonosis treated with voriconazole". JAAD Case Reports. 4 (4): 362–364. doi:10.1016/j.jdcr.2017.11.003. ISSN   2352-5126. PMC   5911819 . PMID   29693071.
  9. ↑ Sugita, Takashi; Nakase, Takashi (1998). "Molecular phylogenetic study of the basidiomycetous anamorphic yeast genus Trichosporon and related taxa based on small subunit ribosomal DNA sequences". Mycoscience. 39 (1): 7–13. doi:10.1007/BF02461572. S2CID   83647795.
  10. ↑ Liu XZ, Wang QM, Göker M, Groenewald M, Kachalkin AV, Lumbsch HT, Millanes AM, Wedin M, Yurkov AM, Boekhout T, Bai FY (2015). "Towards an integrated phylogenetic classification of the Tremellomycetes". Studies in Mycology. 81: 85–147. doi: 10.1016/j.simyco.2015.12.001 . PMC   4777781 .
  11. ↑ Davies, Genna E.; Thornton, Christopher R. (2014). "Differentiation of the emerging human pathogens Trichosporon asahii and Trichosporon asteroides from other pathogenic yeasts and moulds by using species-specific monoclonal antibodies". PLOS ONE. 9 (1): e84789. doi: 10.1371/journal.pone.0084789 . PMC   3879316 . PMID   24392156.
  12. ↑ Howard, Dexter H. (2007). Pathogenic fungi in humans and animals (2nd ed.). New York: Marcel Dekker. ISBN   9780203909102.
  13. 1 2 3 Mariné, Marçal; Bom, Vinicius Leite Pedro; Castro, Patricia Alves de; Winkelstrote, Lizziane Kretli; Ramalh, Leandra Naira; Brown, Neil Andrew; Goldman, Gustavo Henrique (2015). "The development of animal infection models and antifungal efficacy assays against clinical isolates of Trichosporon asahii, T. asteroides and T. inkin". Virulence. 6 (5): 476–86. doi:10.1080/21505594.2015.1020273. PMC   4601256 . PMID   25751127.
  14. ↑ Sugita, T; Nishikawa, A; Shinoda, T (1998). "Rapid detection of species of the opportunistic yeast Trichosporon by PCR". Journal of Clinical Microbiology. 36 (5): 1458–60. doi:10.1128/JCM.36.5.1458-1460.1998. PMC   104855 . PMID   9574732.
  15. ↑ Paula, Claudete R.; Krebs, Vera L. J.; Auler, Marcos E.; Ruiz, Luciana S.; Matsumoto, Flavia E.; Silva, Elza H.; Diniz, Edna M. A.; Vaz, Flavio A. C. (2006). "Nosocomial infection in newborns by in a Brazilian intensive care unit". Medical Mycology. 44 (5): 479–484. doi: 10.1080/13693780600561809 . PMID   16882616.
  16. 1 2 3 4 Ueda, Keiichi; Nakamura, Ichiro; Itano, Eiko Nakagawa; Takemura, Kazunori; Nakazato, Yasutomo; Sano, Ayako (2017). "Trichosporon asteroides Isolated from Cutaneous Lesions of a Suspected Case of "paracoccidioidomycosis ceti" in a Bottlenose Dolphin (Tursiops truncatus)". Mycopathologia. 182 (9–10): 937–946. doi:10.1007/s11046-017-0147-3. PMID   28547342. S2CID   11893217.
  17. 1 2 Kocabaş, Bilge Aldemİr; Karbuz, Adem; Çİftçİ, Ergin; Beğde, Fırat; Ametoglou, Selver; Fouad, Ali Adil; Kalkancı, Ayşe; Karahan, Zeynep Ceren; Aysev, Derya; İnce, Erdal (2016). "Trichosporon asteroides: A novel etiologic agent of Kerion celsi in a child" (PDF). İzmir Dr. Behçet Uz Çocuk Hastanesi Dergisi. 6 (2): 151–154.
  18. 1 2 Maxfield, Luke; Matthews, Juliana J.; Ambrosetti, David Ryan; Ephtimios, Issa E. (2015). "Trichosporon fungemia in a pediatric patient with acute lymphoblastic leukemia". IDCases. 2 (4): 106–108. doi:10.1016/j.idcr.2015.09.007. ISSN   2214-2509. PMC   4712209 . PMID   26793473.
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