Does a tree-like phylogeny only exist at the tips in the prokaryotes?
CJ Creevey, DA Fitzpatrick, GK Philip, RJ Kinsella, MJ O'Connell, MM Pentony, SA Travers, M Wilkinson, JO McInerney
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES | ROYAL SOC | Published : 2004
The extent to which prokaryotic evolution has been influenced by horizontal gene transfer (HGT) and therefore might be more of a network than a tree is unclear. Here we use supertree methods to ask whether a definitive prokaryotic phylogenetic tree exists and whether it can be confidently inferred using orthologous genes. We analysed an 11-taxon dataset spanning the deepest divisions of prokaryotic relationships, a 10-taxon dataset spanning the relatively recent gamma-proteobacteria and a 61-taxon dataset spanning both, using species for which complete genomes are available. Congruence among gene trees spanning deep relationships is not better than random. By contrast, a strong, almost perfe..View full abstract