Project description:A comparison between the coculture of Debaryomyces hansenii with Yarrowia lipolytica and the monoculture of Debaryomyces hansenii, was carried out at two hours of culture (12h and 27h), in order to understand the metabolic changes induced in D. hansenii when grown in coculture with Y. lipolytica . The transcriptomic study was carried out using Agilent 8X15k slides with a custom oligoset designed by V. Loux using the Debaryomyces hansenii ORFeome extracted from genolevures database
Project description:Total RNA versus genomic DNA hybridization on custom arrays designed for all Debaryomyces hansenii genes Total RNA was collected in mid-log phase from Debaryomyces hansenii cells grown in rich medium (abbreviated CM, in house recipe). RNA was then converted to cDNA, Cy3-labeled and hybridized competitively against Cy5 labeled genomic DNA from Debaryomyces hansenii.
Project description:In the frame of a multispecies project, Debaryomyces hansenii cells were treated with 0.5 mM sodium selenite. Cells were collected 10, 20, 30, 40, 50, 60, 70 and 80 minutes after the treatment and their transcriptomes were compared to those of mock-treated cultures. Four independent biological replicates were performed.
Project description:The environmental accumulation of polycyclic aromatic hydrocarbons (PAHs), such as benzo(a)pyrene (BaP), poses significant threats to ecosystems and public health due to their persistent nature, mutagenic potential, and well-documented carcinogenicity. In this study, we investigated the ability of the extremophilic yeast Debaryomyces hansenii to activate specialized detoxification mechanisms for BaP degradation, even under nutrient-deprived conditions. When exposed to 100 ppm BaP, D. hansenii eliminated over 70% of the contaminant within three days while maintaining normal growth dynamics. RNA-Seq analysis revealed widespread transcriptional remodeling, with 1179 genes upregulated and 1031 downregulated under BaP-only conditions, and 1067 upregulated and 977 downregulated genes during co-metabolic exposure (2% glucose + 100 ppm BaP), from a total of 6506 annotated genes. Gene Ontology (GO) and KEGG enrichment analyses highlighted the activation of xenobiotic degradation pathways, notably involving cytochrome P450 monooxygenases (CYPs), epoxide hydrolases (EHs), and glutathione S-transferases (GSTs), alongside an enhanced antioxidant response and finely tuned glutathione homeostasis. This work provides the first comprehensive transcriptomic profile of BaP detoxification in D. hansenii, revealing an intricate and highly adaptive stress response. Collectively, these findings position D. hansenii as a promising eukaryotic platform for bioremediation in saline and contaminated environments, especially where conventional microbial candidates fall short due to environmental extremes or nutrient scarcity.
Project description:The present work studies the effect of Debaryomyces hansenii yeast-based products on physiological responses in Atlantic salmon exposed to a short-term stress. For this, a control fishmeal-based diet (CD) and experimental diets containing 0.1% of Debaryomyces hansenii were fed to fish for 8 weeks in fresh water. At the end of the feeding experiment, fish were exposed to 1-minute hypoxia stress and samples were collected post-stress
Project description:We found that the fungus, Debaryomyces hansenii (D. hansenii), is enriched in inflamed intestinal tissue from patients of Crohn's disease and its administration to mice impairs colonic wound healing in multiple models of colonic injury and repair. To understand the mechanism, we isolated bone marrow derived macrophages from mice and stimulated them in vitro with a pure isolate of D. hansenii. Total RNA was isolated at multiple time points and assayed for transcriptomic analysis.
