Determining divergence times of the major kingdoms of living organisms with a protein clock - PubMed (original) (raw)
Determining divergence times of the major kingdoms of living organisms with a protein clock
R F Doolittle et al. Science. 1996.
Abstract
Amino acid sequence data from 57 different enzymes were used to determine the divergence times of the major biological groupings. Deuterostomes and protostomes split about 670 million years ago and plants, animals, and fungi last shared a common ancestor about a billion years ago. With regard to these protein sequences, plants are slightly more similar to animals than are the fungi. In contrast, phylogenetic analysis of the same sequences indicates that fungi and animals shared a common ancestor more recently than either did with plants, the greater difference resulting from the fungal lineage changing faster than the animal and plant lines over the last 965 million years. The major protist lineages have been changing at a somewhat faster rate than other eukaryotes and split off about 1230 million years ago. If the rate of change has been approximately constant, then prokaryotes and eukaryotes last shared a common ancestor about 2 billion years ago, archaebacterial sequences being measurably more similar to eukaryotic ones than are eubacterial ones.
Comment in
- Dating the cenancester of organisms.
Hasegawa M, Fitch WM. Hasegawa M, et al. Science. 1996 Dec 6;274(5293):1750; author reply 1751-3. Science. 1996. PMID: 8984636 No abstract available. - Dating the cenancester of organisms.
Gogarten JP, Olendzenski L, Hilario E, Simon C, Holsinger KE. Gogarten JP, et al. Science. 1996 Dec 6;274(5293):1750-1; author reply 1751-3. Science. 1996. PMID: 8984637 No abstract available.
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