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Microbial genescapes: a prokaryotic view of the yeast genome.

We examine the translated open reading frames (ORFs) of the yeast Saccharomyces cerevisiae, focusing on those that have FASTA matches in phyletically defined sets of completely sequenced genomes. On this basis, we identify archaeal yeast, bacterial yeast, universal yeast, and yeast ORFs that do not have a match in any of nine prokaryote genomes. Similarly, we examine the yeast mitochondrial genome and the subset of the yeast nuclear ORFs identified as being involved in mitochondrial biogenesis. For the yeast ORFs that match one or more ORFs in these prokaryote genomes, we examine the phyletic and functional distributions of these matches as a function of match strength. These results provide genome level insights into the origin of the eukaryotic cell and the origin of mitochondria. More generally, they exemplify how the growing database of prokaryote genome sequences can help us understand eukaryote genomes.