Genome sequencing of Cladophialophora exuberans, a novel candidate for bioremediation of hydrocarbon and heavy metal polluted habitats

Autor: Nickolas Menezes da Silva, Guilherme Fonseca Reis, Flávia de Fátima Costa, Maria Eduarda Grisolia, Marlon Roger Geraldo, Bruno Paulo Rodrigues Lustosa, Bruna Jacomel Favoreto de Souza Lima, Vinicius Almir Weiss, Emanuel Maltempi de Souza, Ruoyu Li, Yinggai Song, Mariana Machado Fidelis Nascimento, Diogo Robl, Renata Rodrigues Gomes, G. Sybren de Hoog, Vania Aparecida Vicente
Rok vydání: 2023
Předmět:
Zdroj: Fungal Biology, 127, 5, pp. 1032-1042
Fungal Biology, 127, 1032-1042
ISSN: 1878-6146
Popis: Contains fulltext : 292523.pdf (Publisher’s version ) (Closed access) Cladophialophora exuberans is a filamentous fungus related to black yeasts in the order Chaetothyriales. These melanized fungi are known for their 'dual ecology', often occurring in toxic environments and also being frequently involved in human infection. Particularly Cladophialophora exuberans, C. immunda, C. psammophila, and Exophiala mesophila have been described with a pronounced ability to degrade aromatic compounds and xenobiotic volatiles, such as benzene, toluene, ethyl-benzene, and xylene, and are candidates for bioremediation applications. The objective of the present study is the sequencing, assembly, and description of the whole genome of C. exuberans focusing on genes and pathways related to carbon and toxin management, assessing the tolerance and bioremediation of lead and copper, and verifying the presence of genes for metal homeostasis. Genomic evaluations were carried out through a comparison with sibling species including clinical and environmental strains. Tolerance of metals was evaluated via a microdilution method establishing minimum inhibitory (MIC) and fungicidal concentrations (MFC), and agar diffusion assays. Heavy metal bioremediation was evaluated via graphite furnace atomic absorption spectroscopy (GFAAS). The final assembly of C. exuberans comprised 661 contigs, with genome size of 38.10 Mb, coverage of 89.9X and a GC content of 50.8%. In addition, inhibition of growth was shown at concentrations of 1250 ppm for copper and at 625 ppm for lead, using the MIC method. In the agar tests, the strain grew at 2500 ppm of copper and lead. In GFAAS tests, uptake capacities were observed of 89.2% and 95.7% for copper and lead, respectively, after 21 experimental days. This study enabled the annotation of genes involved in heavy metal homeostasis and also contributed to a better understanding of the mechanisms used in tolerance of and adaptation to extreme conditions.
Databáze: OpenAIRE
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