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Saccharomyces cerevisiae strain:PY0001

ABSTRACT: Saccharomyces cerevisiae 'var. boulardii' probiotic yeast genome sequencing and assembly

PROVIDER: PRJNA813746 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	SRR18693990_1.fastq.gz	Fastqsanger.gz
	SRR18693990_2.fastq.gz	Fastqsanger.gz
	SRR18746492_1.fastq.gz	Fastqsanger.gz

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Comparative genomic hybridization of Saccharomyces boulardii and Saccharomyces cerevisiae to determine genomic differences

Project description:A comparative genomic hybridisation experiment using Affymetrix YG-S98 arrays to study the genetic background of S. Boulardii compared to S. Cerevisiae strain BY4743. Background: Saccharomyces boulardii, a yeast that was isolated from fruit in Indochina has been used as a remedy for diarrhoea since 1950, and is now a commercially available treatment throughout Europe, Africa and South America. Though initially classified as a separate species of Saccharomyces, recent publications have shown that the genome of S. boulardii is so similar to Saccharomyces cerevisiae that the two should be classified as conspecific. This raises the question of the distinguishing molecular and phenotypic characteristics present in S. boulardii that make it perform more effectively as a probiotic organism compared to other strains of S. cerevisiae. This investigation reports some of these characteristics including enhanced ability for pseudohyphal switching upon nitrogen limitation and increased resistance to acidic pH. However, these differences did not correlate with increased adherence to epithelial cells or transit through mouse gut. Pertinent characteristics of the S. boulardii genome such as trisomy of chromosome IX, altered copy number of a number of individual genes and sporulation deficiency have been revealed by comparative genome hybridisation using oligonucleotide-based microarrays coupled with a rigorous statistical analysis. The contributions of the different genomic and phenotypic features of S. boulardii to its probiotic nature are discussed.

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Project description:There is a huge disparity between the number of bacterial and yeast probiotics in favor of the former. The latest reports indicate that extracellular vehicles (EVs) play a significant role in probiotic mechanisms. In the present work, we compared the probiotic properties of Saccharomyces cerevisiae strains (WUT3 and WUT151), which have never been previously characterized in this context, with commercial probiotic yeast - Saccharomyces boulardii CNCM-745. Notably, WUT3 and WUT151 reacted more mildly to the unfavorable simulated environment of saliva, stomach, small and large intestines. As a result, we confirmed that WUT3 and WUT151 were superior to S. boulardii in terms of probiotic properties. Then, we performed a complex analysis of their EVs, isolated by a multistep filtration process. The nanoparticle tracing analysis showed no significant difference in the physical structure of the vesicles between the strains. MTT studies confirmed that EVs are not toxic against normal human colorectal cell lines CCD-18 Co and CCD 841 CoN. However, toxicity was observed against the HT-29 cancer line. By staining EVs with Nile Red, we successfully visualized EVs – cell interactions. Finally, we explored the profile of proteins transported with the EVs, identifying a significant overrepresentation of extracellular proteins. Furthermore, based on comparisons with other proteomic data, we selected marker proteins for S. cerevisiae EVs. This knowledge will be helpful for further studies on tracking the transfer of the protein cargo of yeast EVs to human cells using, for instance, specific antibodies to these marker proteins.

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Comparison of S. boulardii cells in H2O vs. S. boulardii cells in H2O+HCl

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