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species distinction in the Trichophyton rubrum complex

Species distinction in the Trichophyton rubrum complex

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多彩菌物美丽中国——中国菌物学会2019年学术年会

作者： Huilin Su Ann Packeu Sarah A.Ahmed Abdullah M.S.Al-Hatmi Oliver Blechert Macit ?lkit Ferry Hagen Yvonne Gr?ser Liu Weida Shuwen Deng Jinhua Xu Min Zhu Sybren de Hoog Department of Dermatology Huashan Hospital Fudan University Centre of Expertise in Mycology of Radboud University Medical Centre/Canisius Wilhelmina Hospital Westerdijk Fungal Biodiversity Institute Sciensano Ministry of Health Directorate General of Health Services Department of Mycology Institute of Dermatology Chinese Academy of Medical Sciences and Peking Union Medical College Division of Mycology Department of Microbiology Faculty of Medicine University of ?ukurova Institut für Mikrobiologie und Hygiene Department of Medical Microbiology People’s Hospital of Suzhou National New ＆ Hi-Tech Industrial Development Zone

Background: The Trichophyton rubrum species complex comprises commonly encountered dermatophytic fungi with worldwide distribution. The members of the complex usually have distinct phenotypes in culture and cause different clinical symptoms despite high genome similarity. Objective: In order to better delimit species within the complex, molecular, phenotypic and physiological characters were combined to re-establish a natural species concept. Results: Three groups T. rubrum, T. soudanense, and T. violaceum could be distinguished based on the sequence of the rDNA ITS barcode gene. On average, strains within each group were similar in colony appearance, microscopy and physiology, but showed significant differences between groups. *** strains had higher keratinase activity, whereas T. violaceum strains tended to be more lipophilic;however,none of the phenotypic features were diagnostic. The results of matrix-assisted laser desorption ionization time-of-flight mass spectrometry（MALDI-TOF） and amplified fragment length polymorphism（AFLP） were partially consistent with the ITS data, but failed to distinguish species unambiguously. Conclusion: Despite their close similarity, T. violaceum, T. soudanense and T. rubrum can be regarded as independent species with distinct geographical distribution and clinical predilection. Trichophyton soudanense is intermediate between T. rubrum and T. violaceum in both genetics and phenotypes. For routine diagnostics, ITS sequencing is recommended.

关键词： Trichophyton rubrum complex species distinction dermatophytes physiology ITS MALDI-TOF AFLP

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