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DNA microarrays containing virtually every gene ofSaccharomyces cerevisiae were used to carry out a comprehensive investigation of the temporal program of gene expression accompanying the metabolic shift from fermentation to respiration. The expression profiles observed for genes with known metabolic functions pointed to features of the metabolic reprogramming that occur during the diauxic shift, and the expression patterns of many previously uncharacterized genes provided clues to their possible functions. The same DNA microarrays were also used to identify genes whose expression was affected by deletion of the transcriptional co-repressorTUP1 or overexpression of the transcriptional activatorYAP1. These results demonstrate the feasibility and utility of this approach to genomewide exploration of gene expression patterns.

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