Evolution of isopenicillin N synthase genes may have involved horizontal gene transfer.
1990
The isopenicillin N synthase genes from three fungal species, three Gram-positive species, and one Gram-negative bacterial species share an unusually high sequence similarity. A phylogentic analysis was carried out to determine which type of evolutionary scenario best accounts for this similarity. The most plausible scenario is one in which a horizontal gene-transfer event, from the prokaryotes to the eukaryotes, occurred at a time close to the divergence between the Gram-positive and the Gram-negative bacteria.
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