The characterization of industrial yeast strains by examining their metabolic footprints (exometabolomes) was investigated and compared to genome-based discriminatory methods. A group of nine industrial brewing yeasts was studied by comparing their metabolic footprints, genetic fingerprints and comparative genomic hybridization profiles. Metabolic footprinting was carried out by both direct injection mass spectrometry (DIMS) and gas chromatography time-of-flight mass spectrometry (GC-TOF-MS), with data analysed by principal components analysis (PCA) and canonical variates analysis (CVA). The genomic profiles of the nine yeasts were compared by PCR-restriction fragment length polymorphism (PCR-RFLP) analysis, genetic fingerprinting using amplified fragment length polymorphism (AFLP) analysis and microarray comparative genome hybridizations (CGH). Metabolomic and genomic analysis comparison of the nine brewing yeasts identified metabolomics as a powerful tool in separating genotypically and phenotypically similar strains. For some strains discrimination not achieved genomically was observed metabolomically.
INTRODUCTIONMass spectrometric analysis of the metabolome (the complete set of small-molecule metabolites such as metabolic intermediates, hormones, and other signaling molecules, and secondary metabolites to be found within a biological sample, such as a single organism) has become a key component of modern systems biology. Within this broad definition, a number of technical refinements have enabled high-throughput profiling to be performed of the exometabolome (the metabolites that a cell or system excretes under controlled conditions). This technique has become known as metabolic footprinting and was first developed for analysis of yeast single- gene deletion mutants. More recently, it has proved valuable in metabolic profiling and comparative analysis of brewing and medically important yeast biodiversity. Direct injection mass spectrometry (DIMS) enables the direct injection or infusion of a sample, typically into an electrospray ionization mass spectrometer (ESI-MS). This article describes a detailed DIMS methodology in which samples of spent media from yeast cultures are introduced into an ESI-MS by direct injection into a flowing solvent (flow injection). DIMS resolves complex mixtures into components differing in ion mass using electrospray ionization, which avoids the need for derivatization and time-consuming chromatographic separation that is found with gas chromatography-mass spectrometry (GC-MS). The method is rapid and discriminatory. Populations of extremely closely related yeast strains can be identified and assigned to clusters of comparable phenotypes, even when standard genetic fingerprinting techniques fail to discriminate among such variants.
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