Abstract
The prominence of seafood in Japan motivates close monitoring of its seas and marine lives for potentially pathogenic fungi. During the treatments of the male Pacific white-sided dolphin (Lagenorhynchus obliquidens) for paracoccidioidomycosis ceti (PCM-C), 5 white and floccose colonies showing identical genotype and morphological characteristics were isolated from two skin biopsy samples of cutaneous granulomatous lesions in 2018. The isolates were identified as Parengyodontium album known as one of fungal species having abilities to produce industrially important proteases, and to become a causative agent for emerging mycosis based on morphological and molecular biological characteristics. These lesions consisted of non-malignant pearl-like structures of hyperplastic keratinocytes. Interestingly, although the isolates could grow at 35 °C, their DNA sequences were phylogenetically located in a cluster consisting of environmental and clinical isolates lacking the ability to grow at 35 °C, based on previous reports. The opportunistic infection we observed in the dolphin might be caused by immune disorder due to PCM-C. Notably, although P. album is recognized as non-harmful, and has significant industrial importance and antitumor activity, it has potential to cause not only superficial but also systemic infection, and presents difficulties in treatment because of its high resistance to antifungal compounds.
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Acknowledgements
We would like to express our sincere gratitude to Dr. Shinji Sasaki (Faculty of Agriculture, University of the Ryukyus) for the gene analysis. This research was done based on an agreement between the University of the Ryukyus and the Okinawa Churashima Foundation. We would also like to thank Editage (www.editage.jp) for English language editing.
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Hikaru Kanegae contributed to mycological and molecular biological studies. Nanako Tomino contributed to partial mycological studies. Yuichi Nakamura contributed to molecular biological studies. Tomoko Minakawa contributed to clinical managements and evaluation of antifungal susceptibilities. Takashi Yaguchi contributed to molecular biological identification, Takeshi Izawa histopathological findings. Ayako Sano is the supervisor and corresponding author. Eiko Nakagawa Itano contributed to epidemiological discussions. Keiichi Ueda is the co-supervisor, contributed to clinical managements and has equal responsibilities to the correspondent author.
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Kanegae, H., Tomino, N., Nakamura, Y. et al. Parengyodontium album Isolated from Cutaneous Lesions of a Pacific White-Sided Dolphin (Lagenorhynchus obliquidens) During Treatment for Paracoccidioidomycosis Ceti. Mycopathologia 185, 1021–1031 (2020). https://doi.org/10.1007/s11046-020-00484-3
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DOI: https://doi.org/10.1007/s11046-020-00484-3