Abstract
The DNA and deduced amino acid sequences of the glycolytic enzyme glucose-6-phosphate isomerase (PGI) were analyzed to infer the phyolgenetic relationships among the PGI genes from eukaryotes and prokaryotes. The inferred phylogeny of the PGI genes is at variance with the conventional phylogenetic scheme of the organisms and suggests that (1) the PGI genes had separated into several lineages prior to the divergence of eukaryotes and prokaryotes; and (2) the progenitor of present-day eukaryotes and prokaryotes already contained several divergent PGI genes. The relevance of the results to horizontal transfer of genes is discussed.
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