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Abstract:
Isolants of nine species of Trichophyton, one of Epidermophyton, and four of Microsporum were assayed for elastase activity. The species or isolants with elastase activity were obtained from patients with inflammatory ring-worm infection. In Nannizzia fulva (M. fulvum), plus-mating-type strains were elastase-positive and minus-mating-type strains elastase-negative. A genetic study of mating type and elastase activity indicated a monogenic basis for both mating type and elastase activity.
Insights
Dermatophyte fungi, including Trichophyton and Microsporum, were tested for elastase. Elastase-positive fungi were linked to inflammatory ringworm, with a single gene controlling elastase and mating type in Nannizzia fulva.
Area of Science:
- Medical Mycology
- Dermatology
- Molecular Genetics
Background:
- Dermatophytes are fungi causing superficial infections like ringworm.
- Elastase is an enzyme that degrades elastin, a key skin protein.
- The role of fungal elastase in dermatophytosis pathogenesis is not fully understood.
Purpose of the Study:
- To investigate elastase activity in various dermatophyte species.
- To correlate elastase production with clinical presentation (inflammatory ringworm).
- To explore the genetic basis of elastase activity and its relationship with mating type in Nannizzia fulva.
Main Methods:
- Assaying elastase activity in isolates of Trichophyton, Epidermophyton, and Microsporum species.
- Correlating elastase-positive isolates with patient diagnoses of inflammatory ringworm.
- Conducting genetic analysis of mating type and elastase activity in Nannizzia fulva.
Main Results:
- Elastase activity was detected in isolates from patients with inflammatory ringworm.
- In Nannizzia fulva, plus-mating-type strains showed elastase activity, while minus-mating-type strains did not.
- A monogenic basis was identified for both mating type and elastase activity in Nannizzia fulva.
Conclusions:
- Fungal elastase may play a role in the inflammatory response during dermatophytosis.
- Mating type and elastase activity are genetically linked in Nannizzia fulva.
- Further research is warranted to elucidate the precise role of fungal elastase in skin infections.