Research NewsEvolution

Direct Descendants From an RNA World

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Science  01 May 1998:
Vol. 280, Issue 5364, pp. 673
DOI: 10.1126/science.280.5364.673

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The newly sequenced microbial genomes are challenging the consensus that eukaryotes, organisms ranging from yeast to human that have nucleated cells, evolved from archaea--one kingdom of nonnucleated prokaryotes--rather than from bacteria, the other prokaryote kingdom. Now a team of microbial evolutionary biologists suggests in the January Journal of Molecular Evolution that eukaryote-like cells actually predated the prokaryotes.