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Whole-genome sequencing and intraspecific analysis of the yeast species Lachancea thermotolerans

ABSTRACT: Sequencing data related to 57 isolates of Lachancea thermotolerans for population genomics purposes

PROVIDER: PRJEB29656 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR2886490_1.fastq.gz	Fastqsanger.gz
	ERR2886490_2.fastq.gz	Fastqsanger.gz
	ERR2886500_1.fastq.gz	Fastqsanger.gz
	ERR2886500_2.fastq.gz	Fastqsanger.gz
	ERR2886510_1.fastq.gz	Fastqsanger.gz

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Lachancea thermotolerans

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Project description:The gold standard in yeast population genomics has been the model organism Saccharomyces cerevisiae. However, the exploration of yeast species outside the Saccharomyces genus is essential to broaden the understanding of genome evolution. Here, we report the analyses of whole-genome sequences of nineisolates from the recently described yeast species Lachancea quebecensis. The genome of one isolate was assembled and annotated, and the intraspecific variability within L. quebecensis was surveyed by comparing the sequences from the eight other isolates to this reference sequence. Our study revealed that these strains harbor genomes with an average nucleotide diversity of π = 2 × 10(-3) which is slightly lower, although on the same order of magnitude, as that previously determined for S. cerevisiae (π = 4 × 10(-3)). Our results show that even though these isolates were all obtained from a relatively isolated geographic location, the same ecological source, and represent a smaller sample size than is available for S. cerevisiae, the levels of divergence are similar to those observed in this model species. This divergence is essentially linked to the presence of two distinct clusters delineated according to geographic location. However, even with relatively similar ranges of genome divergence, L. quebecensis has an extremely low global phenotypic variance of 0.062 compared with 0.59 previously determined in S. cerevisiae.

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yeast Lachancea species

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Population genomic analysis reveals highly conserved mitochondrial genomes in the yeast species Lachancea thermotolerans.

Project description:The increasing availability of mitochondrial (mt) sequence data from various yeasts provides a tool to study genomic evolution within and between different species. While the genomes from a range of lineages are available, there is a lack of information concerning intraspecific mtDNA diversity. Here, we analyzed the mt genomes of 50 strains from Lachancea thermotolerans, a protoploid yeast species that has been isolated from several locations (Europe, Asia, Australia, South Africa, and North / South America) and ecological sources (fruit, tree exudate, plant material, and grape and agave fermentations). Protein-coding genes from the mtDNA were used to construct a phylogeny, which reflected a similar, yet less resolved topology than the phylogenetic tree of 50 nuclear genes. In comparison to its sister species Lachancea kluyveri, L. thermotolerans has a smaller mt genome. This is due to shorter intergenic regions and fewer introns, of which the latter are only found in COX1. We revealed that L. kluyveri and L. thermotolerans share similar levels of intraspecific divergence concerning the nuclear genomes. However, L. thermotolerans has a more highly conserved mt genome with the coding regions characterized by low rates of nonsynonymous substitution. Thus, in the mt genomes of L. thermotolerans, stronger purifying selection and lower mutation rates potentially shape genome diversity in contract to what was found for L. kluyveri, demonstrating that the factors driving mt genome evolution are different even between closely related species.

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