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Occurrence of Arthroderma benhamiae genotype in Japan

Junichiro Hiruma1, Rui Kano, Kazutoshi Harada

  • 1Department of Dermatology, Tokyo Medical University, 6-1-1 Nishishinjuku, Shinjukuku, Tokyo, 160-0023, Japan.

Mycopathologia
|December 1, 2014
PubMed

Insights

This study identified Arthroderma benhamiae clinical isolates in Japan. The first Group II isolate in Japan was found, suggesting this dermatophyte may be more widespread globally than previously thought.

Area of Science:

  • Mycology
  • Dermatology
  • Epidemiology

Background:

  • Arthroderma benhamiae is a zoophilic dermatophyte causing infections in humans and animals.
  • Epidemiological data on A. benhamiae in Japan is limited.
  • Understanding the genetic diversity and distribution of A. benhamiae is crucial for public health.

Purpose of the Study:

  • To investigate the epidemiological characteristics of Arthroderma benhamiae clinical isolates in Japan.
  • To identify the genetic profiles of these isolates using molecular methods.
  • To report the first identification of an A. benhamiae Group II isolate in Japan.

Main Methods:

  • Collection and morphological characterization of clinical isolates from humans and animals.
  • Internal Transcribed Spacer (ITS) region sequence analysis for species identification.
  • Mating type (MAT)-specific PCR to determine the presence of alpha-box and high-mobility-group (HMG) genes.

Main Results:

  • Seven of eight Arthroderma benhamiae isolates belonged to Group I (white phenotype), identified from human, rabbit, and guinea pig samples.
  • One isolate from a degu (Octodon degus) exhibited characteristics of Group II (yellow phenotype) and was confirmed by ITS sequencing.
  • MAT-specific PCR revealed the presence of alpha-box and HMG genes in Group I isolates, while the Group II isolate possessed an alpha-box gene but lacked an HMG gene.

Conclusions:

  • The study reports the first identification of Arthroderma benhamiae Group II in Japan.
  • The findings suggest that A. benhamiae may have a broader global distribution than currently recognized.
  • Further epidemiological surveillance is warranted to understand the prevalence and spread of different A. benhamiae groups.

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