Induced Dimorphism in Dermatophytes

Rippon, John W.; Scherr, George H.

doi:10.2307/3755841

Cited by 17 publications

(10 citation statements)

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“…Extranuclear microtubules, microfilaments, and microfibrils most likely play important roles in nuclear migration into the conidium initial, even after intercellular movement of organelles is restricted to the narrow septal pore (Fig. 3) (39,71,72,227,(334)(335)(336)(337)(338)(339)(340)(341)(342)(343)(344)(345)(346).…”

Section: Blastic Developmentmentioning

confidence: 99%

“…Anamorphs of a single teleomorph (e.g., conidial states of Venturia) may demonstrate different asexual reproductive processes (284), which in turn may lead to confusion in classifications of both asexual (anamorphic) and sexual (teleomorphic) states of such fungi. Even more problematic from the standpoint of applying ontogenetic characters to a classification of conidial fungi is the recognition in a few experimental species that simple mutations or even environmental alterations may result in conversion of one mode of conidial development to another in the same individual (65,346,410,411,418,424,459,460). Confusion has also arisen over terminology, which at the outset was intentionally flexible rather than based on rigid definitions (247), but ultimately generated heated debates over semantic details.…”

Section: Introductionmentioning

confidence: 99%

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Models of cell differentiation in conidial fungi.

Cole¹

1986

Microbiological Reviews

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Section: Blastic Developmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Models of cell differentiation in conidial fungi.

Cole¹

1986

Microbiological Reviews

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“…The total conidial yield of both FR-54 and FR-3383 cultures showed a small decline in response to an increase in the incubation temperature from 28-37°C Sab. agar 10 ± 3 · 10 3 Abundant 6 ± 2 · 10 3 (>80%) 13 ± 3 · 10 3 Abundant 9 ± 3 · 10 3 (>90%) Blood agar 14 ± 3 · 10 3 Abundant 9 ± 2 · 10 3 (>90%) 19 ± 4 · 10 3 Abundant 13 ± 4 · 10 3 (>90%) Saline agar 0.5 ± 0.2 · 10 3 Not detectable 0 1.1 ± 0.4 · 10 3 Few 0.2 ± 0.1 · 10 3 (>60%) 1 Values are mean ± standard deviations of triplicate agar plates. 2 Conidia from creamy-white zones were pooled, clarified of hyphal fragments and suspended in 1 ml.…”

Section: Resultsmentioning

confidence: 99%

Arthroconidial formation in Trichophyton raubitschekii

Gupta

Ahmad

Porretta

et al. 2003

Mycoses

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Arthroconidia produced by dermatophytic fungi are considered to be the primary cause of skin and nail infections in humans and animals. Trichophyton rubrum is currently the most common cause of tinea pedis all over the world. The common form of T. rubrum produces a cottony colony in cultures that is characteristically low in conidia formation. The attempts to produce arthroconidia in T. rubrum have shown little success so far. Recently, Trichophyton raubitschekii, an anthropophilic dermatophyte prevalent in Asia, Africa, and the Mediterranean, has been recognized as a variant of T. rubrum. In cultures, T. raubitschekii is characterized by a granular colony form, and an abundance of both micro- and macroconidia. The present study reveals a predominance of arthroconidia in two T. raubitschekii cultures isolated from clinical materials. These isolates were able to maintain arthroconidiation in bimonthly subcultures throughout the entire course of this study. The growth parameters for in vitro cultivation of arthroconidia are described here. Arthroconidia prepared from T. raubitschekii cultures showed greater than 95% germination within 21 h of suspension in phosphate-buffered saline. The availability of arthroconidia in T. raubitschekii cultures appears to offer a practical means of characterizing infective cells in T. rubrum.

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“…However, there are un-usual cases in which dermatophytes can survive and grow in the deep tissues of patients with granuloma trichophyticurn. In a previous paper, the authors (1) reported a case of granuloma trichophyticum and described the parasitic forms of the causative agent, Trichophyton rubrum, Until now, there have been few experimental studies on the parasitic forms of dermatophytes in the deep tissue (2,3). In 1971, Miyaji and Nishimura (4) studied the conversion process of T. rubrum in vitro.…”

mentioning

confidence: 99%

STUDIES ON THE PARASITIC FORMS OF TRICHOPHYTON RUBRUM ISOLATED FROM PATIENTS WITH GRANULOMA TRICHOPHYTICUM USING THE “AGAR‐IMPLANTATION METHOD”

Nishiyama

Miyaji

Saheki

et al. 1985

The Journal of Dermatology

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We studied the conversion of T. rubrum from hyphae to spherical cells using the agar‐implantation method. Thirteen cultures of T. rubrum were isolated from tinea superficialis and granuloma trichophyticum and they were implanted into the peritoneal cavities of ddY male mice. The cultures were divided into three groups according to their parasitic forms. The first group consisting of two cultures were isolated from tinea unguium and tinea pedis (hyperkeratotic type); they were destroyed in the peritoneal cavities of mice by the sixth week. The eight cultures in the second group were isolated from tinea cruris, tinea circinata and tinea pedis (vesicular type); they converted to spherical cells and survived for 16 weeks. The three cultures of the third group were isolated from granuloma trichophyticum; they survived and grew as hyphal forms in the peritoneal cavities of mice for over 26 weeks without spherical cell conversion. In conclusion, the parasitic forms of the three cultures isolated from granuloma trichophyticum differed from the cultures isolated from tinea superficialis.

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Induced Dimorphism in Dermatophytes

Cited by 17 publications

References 0 publications

Models of cell differentiation in conidial fungi.

Models of cell differentiation in conidial fungi.

Arthroconidial formation in Trichophyton raubitschekii

STUDIES ON THE PARASITIC FORMS OF TRICHOPHYTON RUBRUM ISOLATED FROM PATIENTS WITH GRANULOMA TRICHOPHYTICUM USING THE “AGAR‐IMPLANTATION METHOD”

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