Rigoberto Hernandez-Castro, Roberto Arenas, Israel Esquivel-Pinto, Teerapong Rattananukrom
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引用次数: 0
Abstract
Chromoblastomycosis (CBM) is a chronic fungal infection caused by dematiaceous fungi. In some cases, culture methods fail to identify the fungal species, and fresh tissue for molecular identification is unavailable. The use of molecular techniques on formalin-fixed, paraffin-embedded (FFPE) samples can aid in identifying the causative agent. This study aimed to identify fungal species in histopathologically confirmed cases of CBM using PCR and sequencing of 18S-ITS1-5.8S-ITS2-28S rDNA region of FFPE skin biopsies and to describe their clinicopathological features. This retrospective study used FFPE samples from nine CBM patients from remote regions of Mexico. The samples were submitted to the Mycology Section at the Hospital General "Dr. Manuel Gea González" (2000-2016) for molecular identification of the causative agent and characterization of clinicopathological features. Lesions were most commonly located on the forearm (four cases), with one case each on the buttock, back, foot, and leg. One patient presented with cutaneous dissemination. Verrucous plaques were observed in 88.9% of cases. Histology and direct examination confirmed CBM, showing muriform cells and varying degrees of dermal fibrosis in all cases. DNA extracted from FFPE samples was amplified and sequenced in the 18S-ITS1-5.8S-ITS2-28S rDNA region, identifying Fonsecaea pedrosoi with 100% homology in all cases. This study identifies F. pedrosoi as the predominant pathogen of CBM in the evaluated samples of Mexican origin and demonstrates the reliability of molecular identification using FFPE samples.
期刊介绍：
Medical Mycology is a peer-reviewed international journal that focuses on original and innovative basic and applied studies, as well as learned reviews on all aspects of medical, veterinary and environmental mycology as related to disease. The objective is to present the highest quality scientific reports from throughout the world on divergent topics. These topics include the phylogeny of fungal pathogens, epidemiology and public health mycology themes, new approaches in the diagnosis and treatment of mycoses including clinical trials and guidelines, pharmacology and antifungal susceptibilities, changes in taxonomy, description of new or unusual fungi associated with human or animal disease, immunology of fungal infections, vaccinology for prevention of fungal infections, pathogenesis and virulence, and the molecular biology of pathogenic fungi in vitro and in vivo, including genomics, transcriptomics, metabolomics, and proteomics. Case reports are no longer accepted. In addition, studies of natural products showing inhibitory activity against pathogenic fungi are not accepted without chemical characterization and identification of the compounds responsible for the inhibitory activity.
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