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Saccharomyces pastorianus

ABSTRACT: Group I lager yeast

PROVIDER: PRJNA12850 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	SRR11300944_1.fastq.gz	Fastqsanger.gz
	SRR11300944_2.fastq.gz	Fastqsanger.gz
	SRR11300945_1.fastq.gz	Fastqsanger.gz
	SRR11300945_2.fastq.gz	Fastqsanger.gz

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Aneuploidy influences the gene expression profiles in Saccharomyces pastorianus group I and II strains during fermentation.

Project description:We report the gene expression profile of two polypolid Saccharomyces pastorianus, lager yeast strains, the Group I strain CBS1538 and the Group II strain W34/70. Saccharomyces pastorianus is a hybrid of Saccharomuyces cerevisiaie and Saccharomyces eubayanus. We report that the gene expression patterns are correlated with the gene copy number of S. cerevisiae and S. eubayanus alleles.

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Project description:Saccharomyces pastorianus is the yeast used to make lager beer; it is known to be an interspecific hybrid formed by the fusion between S. cerevisiae and S. bayanus genomes. This data set queries 17 S. pastorianus strains, collected at various times over the last 125 years from various breweries located in different geographical locations, which were obtained from CBS and DBVPG culture collections. The data in this set represent array-CGH experiments performed with these strains, using "2-species" custom Agilent arrays (the "2-species" arrays contain probes spaced every ~2 kb across the whole genomes of both S. cerevisiae and S. bayanus; the probes are unique and specific for each genome). The data set also contains 3 self-self hybridizations (S. cerevisiae + S. bayanus DNA mixed together in equimolar amounts, then labeled green or red in separate reactions, then hybridized to the "2-species" arrays) used for normalization in CGH-Miner analysis. A strain or line experiment design type assays differences between multiple strains, cultivars, serovars, isolates, lines from organisms of a single species.

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Expression Patterns of Mal genes and Association with Differential Maltose and Maltotriose Transport rate of Two Saccharomyces pastorianus Yeasts

Project description:Beer brewing is a well-known process that still faces great challenges, such as the total consumption of sugars present in the fermentation media. Lager-style beer, major worldwide beer type, is elaborated by Saccharomyces pastorianus (Sp) yeast which must ferment high maltotriose content worts, but its consumption represents a notable problem, especially among Sp strains belonging to group I. Factors like fermentation conditions, presence of maltotriose transporters, transporter copy number variation, and genetic regulation variations contribute to this issue. We assess the factors affecting fermentation in two Sp yeast strains: SpIB1, with limited maltotriose uptake, and SpIB2, known for efficient maltotriose transport. Here, SpIB2 transported significantly more maltose (28%) and maltotriose (32%) compared to SpIB1. Furthermore, SpIB2 expressed all MAL transporters (ScMALx1, SeMALx1, ScAGT1, SeAGT1, MTT1, and MPHx) on the first day of fermentation, while SpIB1 only exhibited ScMalx1, ScAGT1, and MPH2/3 genes. Some SpIB2 transporters had polymorphic transmembrane domains (TMD) resembling MTT1, accompanied by higher expression of these transporters and its positive regulator genes like MAL63. These findings suggest that, in addition of the factors mentioned above, positive regulators of Mal transporters contribute significatively to phenotypic diversity in maltose and maltotriose consumption among the studied lager yeast strains.

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Project description:A transcriptome analysis of the bottom-fermenting yeast S. pastorianus KBY011 during a time course of lager beer fermentation in the wort was carried out (0, 2, 6, 8, 10, 14, 24, 34, 40, 52, 64, 120, and 156h). RNA preparation followed by DNA microarray analysis was performed for the yeast harvested from the yeast storage tank either just prior to, or just after the actual fermentation, as well as from 12 different time points during fermentation.

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Project description:Nanopore sequencing and comparative genome analysis confirm lager-brewing yeasts originated from a single hybridization

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Project description:Chromosomal copy number variation in Saccharomyces pastorianus: evidence for extensive genome dynamics in industrial lager brewing strains.

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