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Identification of oleic acid-induced transcriptome changes under anaerobic conditions in the yeast Candida albicans

ABSTRACT: Identification of oleic acid-induced transcriptome changes under anaerobic conditions in the yeast Candida albicans

PROVIDER: PRJNA1298294 | ENA |

REPOSITORIES: ENA

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Identification of oleic acid-induced transcriptome changes under anaerobic conditions in the yeast Candida albicans

Project description:Dietary components influence microbial composition in the digestive tract. Although often viewed as energy sources, dietary components are likely to shape microbial determinants of intestinal colonization beyond metabolism. Here, we report that a dietary long-chain fatty acid enhances the yeast Candida albicans colonization of the murine gut partly by eliciting modifications to the fungal cell surface. Mice fed an oleic acid-rich diet were readily colonized by C. albicans and exhibited higher fungal load in feces compared to rodents fed an isocaloric control diet. Surprisingly, β-oxidation, a catabolic process to break down fatty acids for energy production, was dispensable for C. albicans to colonize the high-oleic acid diet-fed mice. RNA-Seq was employed to identify oleic acid-induced transcriptome changes under anaerobic conditions. We identified SOK1 as an oleic acid-induced kinase that dictates cell wall mannan exposure and binding to intestinal mucin under anaerobic conditions. Furthermore, oleic acid induced the expression of several C. albicans transcription factors that positively regulate intestinal colonization via remodeling of the fungal cell surface.

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Project description:Candida albicans is a commensal fungus in humans, mostly found on the mucosal surfaces of the mouth, gut, vagina and skin. Incidence of ever increasing invasive candidiasis in immunocompromised patients, alarming occurrence of antifungal resistance and insufficient diagnostic methods demand more focused research into C. albicans pathogenicity. Consequently, in the present study, oleic acid from Murraya koenigii was shown to have the efficacy to inhibit biofilm formation and virulence of Candida spp. Results of in vitro virulence assays and gene expression analysis, impelled to study the protein targets which are involved in the molecular pathways of C. albicans pathogenicity. Proteomic studies of differentially expressed proteins reveals that oleic acid induces oxidative stress responses and mainly targets the proteins involved in glucose metabolism, ergosterol biosynthesis, lipase production, iron homeostasis and amino acid biosynthesis. The current study emphasizes anti-virulent potential of oleic acid which can be used as a therapeutic agent to treat Candida infections.

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