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Xanthophyllomyces dendrorhous whole genome and transcriptome analyses

ABSTRACT: Xanthophyllomyces dendrorhous

PROVIDER: PRJEB6925 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	ERR575093_1.fastq.gz	Fastqsanger.gz
	ERR575093_2.fastq.gz	Fastqsanger.gz
	ERR575094_1.fastq.gz	Fastqsanger.gz
	ERR575094_2.fastq.gz	Fastqsanger.gz

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Sterol Regulatory Element-Binding Protein Sre1 regulates carotenogenesis in the red yeast Xanthophyllomyces dendrorhous.

Project description:Xanthophyllomyces dendrorhous is a basidiomycete yeast that produces carotenoids, mainly astaxanthin. Astaxanthin is an organic pigment of commercial interest due to its antioxidant and coloring properties. X. dendrorhous has a functional Sterol Regulatory Element-Binding Protein (SREBP) pathway, and the Sre1 protein is the SREBP homolog in this yeast. However, how Sre1 is promoting the biosynthesis of sterols and carotenoids in X. dendrorhous is unknown. In this work, comparative RNA-seq analysis between modified X. dendrorhous strains that have an active Sre1 protein and the wild-type was performed to identify Sre1-dependent genes. In addition, Sre1 direct target genes were identified through chromatin immunoprecipitation combined with lambda exonuclease digestion (ChIP-exo) assays. SRE motifs were detected in the promoter regions of several Sre1 direct target genes and were consistent with the SREs described in other yeast species. Sre1 directly regulates genes related to ergosterol biosynthesis as well as genes related to the mevalonate pathway, which synthesizes the building blocks of isoprenoids, including carotenoids. Two carotenogenic genes, crtE and crtR, were also identified as Sre1 direct target genes. Thus, carotenogenesis in X. dendrorhous is regulated by Sre1 through the regulation of the mevalonate pathway and the regulation of the crtE and crtR genes. As the crtR gene encodes a cytochrome P450 reductase, Sre1 regulates pathways that include cytochrome P450 enzymes, such as the biosynthesis of carotenoids and sterols. These results demonstrate that Sre1 is a sterol master regulator that is conserved in X. dendrorhous.

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Intestinal Microbiome, Oral Microbiome, and Whole Blood Transcriptome Analyses in Gastrointestinal Malignancies

Project description:The primary objective of this prospective observational study is to characterize the gut and oral microbiome as well as the whole blood transcriptome in gastrointestinal cancer patients and correlate these findings with cancer type, treatment efficacy and toxicity. Participants will be recruited from existing clinical sites only, no additional clinical sites are needed.

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