The emergence of major cellular processes in evolution

FEBS Letters
Christos A Ouzounis, N Kyrpides


The phylogenetic distribution of divergently related protein families into the three domains of life (archaea, bacteria and eukaryotes) can signify the presence or absence of entire cellular processes in these domains and their ancestors. We can thus study the emergence of the major transitions during cellular evolution, and resolve some of the controversies surrounding the evolutionary status of archaea and the origins of the eukaryotic cell. In view of the ongoing projects that sequence the complete genomes of several Archaea, this work forms a testable prediction when the genome sequences become available. Using the presence of the protein families as taxonomic traits, and linking them to biochemical pathways, we are able to reason about the presence of the corresponding cellular processes in the last universal ancestor of contemporary cells. The analysis shows that metabolism was already a complex network of reactions which included amino acid, nucleotide, fatty acid, sugar and coenzyme metabolism. In addition, genetic processes such as translation are conserved and close to the original form. However, other processes such as DNA replication and repair or transcription are exceptional and seem to be associated with the stru...Continue Reading


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