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Identification of the lncRNA DINOR as a global stress regulator in the super fungus Candida auris

ABSTRACT: Identification of the lncRNA DINOR as a global stress regulator in the super fungus Candida auris

PROVIDER: PRJNA718866 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR14119418.fastq.gz	Fastqsanger.gz
	SRR14119418_1.fastq.gz	Fastqsanger.gz
	SRR14119418_2.fastq.gz	Fastqsanger.gz
	SRR14119419.fastq.gz	Fastqsanger.gz
	SRR14119419_1.fastq.gz	Fastqsanger.gz

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Identification of the lncRNA DINOR as a global stress regulator in the super fungus Candida auris

Project description:The goal of this RNA-Seq study is to elucidate DINOR’s function in regulating C. auris morphogenesis.

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Candida auris proteomic profiling

Project description:In this study, we designed a novel antifungal agent, PQA-Az-13 that demonstrated antifungal activity against C. auris biofilms. Cellular proteomics indicated that PQA-Az-13 partially or completely inhibited numerous enzymatic proteins in C. auris biofilms, particularly those involved in both amino acid biosynthesis and metabolism processes, as well as in general energy-producing processes. Due to its hydrophobic nature and limited aqueous solubility, PQA-Az-13 was encapsulated in cationic liposomes and characterized by biophysical and spectral techniques. PQA-Az-13 liposomes demonstrated enhanced antifungal activity levels against both C. auris in in vitro biofilms and ex vivo skin colonization models.

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Candida auris-macrophage cellular interactions and transcriptional response

Project description:The pathogenic yeast Candida auris represents a global threat of the utmost clinical relevance. This emerging fungal species is remarkable in its resistance to commonly used antifungal and its persistence in the nosocomial settings. The innate immune system is one the first lines of defense preventing the dissemination of pathogens in the host. C. auris is susceptible to circulating phagocytes, namely neutrophils. However, some gaps of knowledge remain regarding the cellular and transcriptional responses towards other phagocytic lineages. In this work, we examined the interactions of this yeast with macrophages. We found that macrophages avidly phagocytose C. auris, however intracellular replication is not inhibited, indicating that C. auris is able to resist the killing mechanisms imposed by the phagocyte. Intracellular replication does not induce macrophage lysis, however. The transcriptional response of C. auris to macrophage phagocytosis is very similar to other members of the CUG clade (C. albicans, C. tropicalis, C. parapsilosis, C. lusitaniae), i.e., downregulation of transcription/translation and upregulation of alternative carbon metabolism pathways, transporters and induction of oxidative stress response and proteolysis. Gene family expansions are common in this yeast, and we found that many of these genes are induced in response to macrophage co-incubation. Among these, amino acid and oligopeptide transporters, as well as lipases and proteases are upregulated. Thus, C. auris shares key transcriptional signatures shared with other fungal pathogens and capitalizes on the expansion of gene families coding for potential virulence attributes that allow its survival, persistence, and evasion of the innate immune system.

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Project description:Transcriptomic analysis of different Candida auris clinical isolates with distinct antifungal susceptibility profiles.

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Candida auris whole cell proteomics

Project description:Whole cell proteomics of Candida auris MMC1 and MMC2 strains.

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Candida auris extracellular vesicle proteomics

Project description:Proteomic analysis of extracellular vesicles from Candida auris MMC1 and MMC2 strains.

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Host immune response against the emerging fungal pathogen Candida auris: transcriptional and functional insights

Project description:Candida auris is amongst the most important emerging fungal pathogens, yet mechanistic insights in its immune recognition and control are lacking. Here, we integrate transcriptional and functional immune cell profiling to uncover innate anti-C. auris defense mechanisms. C. auris induces a specific transcriptome in human mononuclear cells, a stronger cytokine response compared to C. albicans, but a lower macrophage lysis capacity. C. auris-induced innate immune activation is mediated through recognition of C-type lectin receptors, mainly elicited by structurally unique C. auris mannoproteins. In in-vivo experimental models of disseminated candidiasis, C. auris was less virulent than C. albicans. Collectively, these results demonstrate that C. auris is a strong inducer of innate host defense and identify possible targets for adjuvant immunotherapy.

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Overcoming amphotericin B resistance in Candida auris using the antiemetic drug, rolapitant

Project description:The emergence of Candida auris poses a significant health challenge that has led to a new era of multidrug-resistant fungal infections. Invasive infections caused by C. auris are usually associated with remarkable morbidity and mortality. For many years, amphotericin B (AmB) remained the most efficient and the last line of treatment against most hard-to-treat fungal infections. However, strains of C. auris possess extraordinary resistance to most antifungal agents, including AmB. In this study, we screened ~2600 FDA-approved drugs and clinical compounds to identify the antiemetic drug rolapitant as a promising enhancer to AmB against C. auris. Rolapitant exhibited potent synergistic interactions with AmB against all tested (29/29) C. auris isolates. In a time-kill assay, rolapitant restored the fungicidal activity of AmB within 4 h. Additionally, the synergistic relationship between rolapitant and AmB was observed against other medically crucial Candida, Cryptococcus and Aspergillus species with ΣFICI that ranged from 0.16 to 0.5. In a transcriptomic study, ion transporters and ATP generation were identified as primary pathways impacted in C. auris AR0390 cells exposed to rolapitant. An ATP luminescence assay confirmed that rolapitant, at sub-inhibitory concentrations, significantly interfered with ATP production in C. auris. Moreover, rolapitant enhanced the in vivo activity of AmB in a mouse model of disseminated C. auris infection, as the combination reduced the fungal burden in murine kidneys by ~1 log (~90%) colony forming units. Our findings warrant further investigation of using rolapitant to overcome AmB resistance in C. auris and other fungal species.

2024-09-26 | GSE263806 | GEO

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