Single-Locus, Two-Allele Basis for Inheritance of the Granular and a Downy Form of the Ringworm Fungus Arthroderma benhamiae (=Trichophyton mentagrophytes Var. granulosum)

Maniotis, James; Chu-Cheung, Sze-Shuen

doi:10.2307/3757785

Cited by 4 publications

(1 citation statement)

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“…The same system was also demonstrated in Arthroderma simii (151,236) and Arthroderma benhamiae (7). Maniotis and Chu-Cheung (164) reported that the incompatibility locus in A. benhamiae is either nonlinked or distal to the colonial morphology locus, e.g., regulating the downy and granular phenotypes.…”

Section: Genetics Heterothallismmentioning

confidence: 61%

The dermatophytes

1995

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The etiologic agents of the dermatophytoses (ringworm) are classified in three anamorphic (asexual or imperfect) genera, Epidermophyton, Microsporum, and Trichophyton. Species capable of reproducing sexually belong in the teleomorphic genus, Arthroderma, of the Ascomycota. On the basis of primary habitat association, they may be grouped as geophilic (soil associated), zoophilic, and anthropophilic. Adaptation to growth on humans by most geophilic species resulted in diminished loss of sporulation, sexuality, and other soil-associated characteristics. The dermatophytes have the ability to invade keratinized tissue (skin, hair, and nails) but are usually restricted to the nonliving cornified layer of the epidermis because of their inability to penetrate viable tissue of an immunocompetent host. However, invasion does elicit a host response ranging from mild to severe. Acid proteinases, elastase, keratinases, and other proteinases reportedly act as virulence factors. The development of cell-mediated immunity correlated with delayed hypersensitivity and an inflammatory response is associated with clinical cure, whereas the lack of or a defective cell-mediated immunity predisposes the host to chronic or recurrent dermatophyte infection. Chronic dermatophytosis is mostly caused by Trichophyton rubrum, and there is some evidence that mannan produced by this fungus suppresses or diminishes the inflammatory response. Since dermatophytes cause a communicable disease, modes of transmission and control are discussed as well as a survey of recent trends in therapy. Collection of specimens, culture media, and tests for identification are also presented. Genetic studies have led to an understanding of incompatibility mechanisms, pleomorphism and variation, resistance to griseofulvin, and virulence. Molecular biology has contributed to our knowledge of the taxonomy and phylogenetic relationships of dermatophytes.

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Section: Genetics Heterothallismmentioning

confidence: 61%

The dermatophytes

1995

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Ultrastructural aspects of ascosporulation inArthroderma quadrifidum (=Trichophyton terrestre)

1976

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The ultrastructural features of developing and mature ascospores were delineated after mating Arthroderma quadrifidum on pablum cereal agar. Incipient ascospores each contained a granulated nucleus bounded by a nuclear envelope while presumptive ascospore cytoplasm was bounded by a double membrane and resided in glycogen-rich epiplasm of the ascus. Mature ascospores contained nuclei and mitochondria while the ascus epiplasm still retained abundant inclusions. The ascospore wall demonstrated the presence of heterogeneous material between the plasmalemma and the outer spore membrane which appeared smooth.

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The taxonomic status of the hedgehog fungusTrichophyton erinacei

Padhye¹,

Ajello²

1977

Med Mycol

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Single-Locus, Two-Allele Basis for Inheritance of the Granular and a Downy Form of the Ringworm Fungus Arthroderma benhamiae (=Trichophyton mentagrophytes Var. granulosum)

Cited by 4 publications

References 0 publications

The dermatophytes

The dermatophytes

Ultrastructural aspects of ascosporulation inArthroderma quadrifidum (=Trichophyton terrestre)

The taxonomic status of the hedgehog fungusTrichophyton erinacei

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