Molecular Biology and Evolution, Vol 15, 779-788, Copyright © 1998 by Society for Molecular Biology and Evolution
S Ribeiro and GB Golding
The phylogenies for each of the protein-coding genes from the Methanococcus
jannaschii genome were surveyed to determine the history of the major
groups of life. For each gene, homologous sequences from other archaea,
eucarya, and Gram-positive and Gram-negative bacteria were collected and
aligned, and a phylogeny was reconstructed with a maximum-likelihood
algorithm. The majority of significant phylogenies favor the eucarya and
the archaca as sister groups. A smaller, but still substantial, portion of
these significant phylogenies favor an eucarya/Gram-negative clade. These
results indicate that support for the early history of life is not
unequivocal. A chimeric origin of eukaryotes or an ancient, massive
horizontal transfer of genes from Gram-negative bacteria to eucarya can
explain many of the observed phylogenies.
ORIGINAL ARTICLE
The mosaic nature of the eukaryotic nucleus
Department of Biology, McMaster University, Hamilton, Ontario, Canada.
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