Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Genomic Tandem Quadruplication is Associated with Ketoconazole Resistance in Malassezia pachydermatis

  • Kim, Minchul (Department of Systems Biotechnology, Chung-Ang University) ;
  • Cho, Yong-Joon (Korea Polar Research Institute) ;
  • Park, Minji (Department of Systems Biotechnology, Chung-Ang University) ;
  • Choi, Yoojeong (Department of Systems Biotechnology, Chung-Ang University) ;
  • Hwang, Sun Young (Haemaru Small Animal Research Institute) ;
  • Jung, Won Hee (Department of Systems Biotechnology, Chung-Ang University)
  • Received : 2018.10.15
  • Accepted : 2018.11.07
  • Published : 2018.11.28
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Abstract

Malassezia pachydermatis is a commensal yeast found on the skin of dogs. However, M. pachydermatis is also considered an opportunistic pathogen and is associated with various canine skin diseases including otitis externa and atopic dermatitis, which usually require treatment using an azole antifungal drug, such as ketoconazole. In this study, we isolated a ketoconazole-resistant strain of M. pachydermatis, designated "KCTC 27587," from the external ear canal of a dog with otitis externa and analyzed its resistance mechanism. To understand the mechanism underlying ketoconazole resistance of the clinical isolate M. pachydermatis KCTC 27587, the whole genome of the yeast was sequenced using the PacBio platform and was compared with M. pachydermatis type strain CBS 1879. We found that a ~84-kb region in chromosome 4 of M. pachydermatis KCTC 27587 was tandemly quadruplicated. The quadruplicated region contains 52 protein coding genes, including the homologs of ERG4 and ERG11, whose overexpression is known to be associated with azole resistance. Our data suggest that the quadruplication of the ~84-kb region may be the cause of the ketoconazole resistance in M. pachydermatis KCTC 27587.

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References

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