New Species of Madurella, Causative Agents of Black-Grain Mycetoma

G Sybren de Hoog, Anne D van Diepeningen, El-Sheikh Mahgoub, Wendy W J van de Sande

    Research output: Contribution to journal/periodicalArticleScientificpeer-review

    Abstract

    A new species of nonsporulating fungus, isolated in a case of black-grain mycetoma in Sudan, is described as Madurella fahalii. The species is characterized by phenotypic and molecular criteria. Multigene phylogenies based on the ribosomal DNA (rDNA) internal transcribed spacer (ITS), the partial beta-tubulin gene (BT2), and the RNA polymerase II subunit 2 gene (RPB2) indicate that M. fahalii is closely related to Madurella mycetomatis and M. pseudomycetomatis; the latter name is validated according to the rules of botanical nomenclature. Madurella ikedae was found to be synonymous with M. mycetomatis. An isolate from Indonesia was found to be different from all known species based on multilocus analysis and is described as Madurella tropicana. Madurella is nested within the order Sordariales, with Chaetomium as its nearest neighbor. Madurella fahalii has a relatively low optimum growth temperature (30 degrees C) and is less susceptible to the azoles than other Madurella species, with voriconazole and posaconazole MICs of 1 mu g/ml, a ketoconazole MIC of 2 mu g/ml, and an itraconazole MIC of > 16 mu g/ml. Since eumycetoma is still treated only with azoles, correct species identification is important for the optimal choice of antifungal therapy.
    Original languageEnglish
    Pages (from-to)988-994
    Number of pages7
    JournalJournal of Clinical Microbiology
    Volume50
    Issue number3
    DOIs
    Publication statusPublished - Mar 2012

    Keywords

    • Antifungal Agents
    • DNA, Fungal
    • DNA, Ribosomal Spacer
    • Fungal Proteins
    • Humans
    • Leg
    • Madurella
    • Male
    • Microbial Sensitivity Tests
    • Middle Aged
    • Molecular Sequence Data
    • Mycetoma
    • Phylogeny
    • Pyrimidines
    • RNA Polymerase II
    • Sequence Analysis, DNA
    • Sudan
    • Triazoles
    • Tubulin
    • Voriconazole

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