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Science 25 November 2005:
Vol. 310. no. 5752, p. 1241
DOI: 10.1126/science.310.5752.1241e
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This Week in Science

Evolution has increased the complexity of organisms, especially bacteria and single-celled eukaryotes that are contrasted with vertebrates, but it does not necessarily follow that the genes and genomes of organisms that arose early in evolution should be less complex than those of newer species. Raible et al. (p. 1325) analyzed the genome of the marine ragworm, Platynereis dumerilii, a possible "living fossil," and show that the structure of its genes is remarkably complex, and that its genome has an intron richness which resembles that of human genome. These two very different organisms have retained this genetic complexity, which has been lost in the other insects and nematodes whose genomes have been studied.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)