Project description:Bifidobacterium longum subsp. infantis (B. infantis) colonizes the infant gut microbiome with a 43-kb gene cluster that enables human milk oligosaccharide (HMO) utilization. Although there is relative genomic homogeneity in this regard, previous observations suggest that B. infantis strains may differ in their utilization phenotype. To test this hypothesis, a panel of B. infantis strains were evaluated for their ability to utilize pooled HMOs to yield differential phenotypes including biomass accumulation, HMO consumption glycoprofile, end-product secretion, and global transcriptomes. Two strains (ATCC 15697 and UMA301) efficiently consumed several HMO isomers/anomers that exhibit degrees of polymerization (DP) ³ 4. These same strains partially consumed the smaller DP HMOs including fucosyllactose and lactodifucotetraose isomers/anomers. In contrast, UMA299 efficiently utilized fucosylated small molecular weight HMOs (DP<4), and accumulated greater biomass on purified 2´FL with significantly higher 1,2-propanediol production. This study identifies several strain-dependent features in HMO utilization phenotypes that are consistent with metabolic variation within a bifidobacterial-dominated infant-gut microbiome.
Project description:Investigation of whole genome gene expression level changes in Spathaspora passalidarum NRRL Y-27907 grown aerobically in xylose, compared to the same strain grown aerobically in glucose. A six array study using total RNA recovered from three separate cultures of Spathaspora passalidarum NRRL Y-27907 grown in glucose and three separate cultures of Spathaspora passalidarum NRRL Y-27907 grown in xylose. Each array measures the expression level of 362,487 probes (average probe length 54.5 +/- 4.0 nt) tiled across the Spathaspora passalidarum NRRL Y-27907 genome with a median spacing distance of 29 nt. During data processing, probes are filtered to include only those probes corresponding to annotated protein-coding genes.
Project description:Investigation of whole genome gene expression level changes in Candida tenuis NRRL Y-1498 grown aerobically in xylose, compared to the same strain grown aerobically in glucose. A six array study using total RNA recovered from three separate cultures of Candida tenuis NRRL Y-1498 grown in glucose and three separate cultures of Candida tenuis NRRL Y-1498 grown in xylose. Each array measures the expression level of 363,196 probes (average probe length 53.1 +/- 3.8 nt) tiled across the Candida tenuis NRRL Y-1498 genome with a median spacing distance of 24 nt. During data processing, probes are filtered to include only those probes corresponding to annotated protein-coding genes.
Project description:Investigation of whole genome gene expression level changes in Lodderomyces elongisporus NRRL YB-4239 grown aerobically in xylose, compared to the same strain grown aerobically in glucose. A six array study using total RNA recovered from three separate cultures of Lodderomyces elongisporus NRRL YB-4239 grown in glucose and three separate cultures of Lodderomyces elongisporus NRRL YB-4239 grown in xylose. Each array measures the expression level of 371,451 probes (average probe length 54.1 +/- 4.1 nt) tiled across the Lodderomyces elongisporus NRRL YB-4239 genome with a median spacing distance of 33 nt. During data processing, probes are filtered to include only those probes corresponding to annotated protein-coding genes.
Project description:Investigation of whole genome gene expression level changes in Lodderomyces elongisporus NRRL YB-4239 grown aerobically in xylose, compared to the same strain grown aerobically in glucose.
Project description:Investigation of whole genome gene expression level changes in Spathaspora passalidarum NRRL Y-27907 grown aerobically in xylose, compared to the same strain grown aerobically in glucose.
Project description:Investigation of whole genome gene expression level changes in Candida tenuis NRRL Y-1498 grown aerobically in xylose, compared to the same strain grown aerobically in glucose.
