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. 2021;62(2):41-44.
doi: 10.3314/mmj.21-00001.

Rapid Molecular Detection of Terbinafine-resistant Dermatophytes

Rui Kano  1 , Hiromitsu Noguchi  2   3 , Kazutoshi Harada  4 , Masataro Hiruma  3
Affiliations
Free article

Rapid Molecular Detection of Terbinafine-resistant Dermatophytes

Rui Kano et al. Med Mycol J. 2021.
Free article

Abstract

Terbinafine (TRF)-resistant Trichophyton interdigitale and Trichophyton rubrum have been isolated from human patients. These strains have missense mutations (Leu393Ser/Phe or Phe397Leu) in the squalene epoxidase-encoding gene, SQLE. We developed a PCR detection method to identify hotspot mutation sites in SQLE genes of dermatophytes. To sequence hotspots in isolates, we prepared primers based on conserved sequences of T. rubrum and T. interdigitale SQLEs. Approximately 390-bp long DNA bands for T. rubrum, T. interdigitale, and Trichophyton indotineae strains were sequenced. Hotspots were detected only in TRF-resistant strains. This PCR-based method is simpler and more rapid than the conventional test.

Keywords: Trichophyton rubrum; dermatophytosis; polymerase chain reaction; resistance; terbinafine.

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