𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Where is the root of the universal tree of life?

✍ Scribed by Patrick Forterre; Hervé Philippe

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
154 KB
Volume
21
Category
Article
ISSN
0265-9247

No coin nor oath required. For personal study only.

✦ Synopsis

The currently accepted universal tree of life based on molecular phylogenies is characterised by a prokaryotic root and the sisterhood of archaea and eukaryotes. The recent discovery that each domain (bacteria, archaea, and eucarya) represents a mosaic of the two others in terms of its gene content has suggested various alternatives in which eukaryotes were derived from the merging of bacteria and archaea. In all these scenarios, life evolved from simple prokaryotes to complex eukaryotes. We argue here that these models are biased by overconfidence in molecular phylogenies and prejudices regarding the primitive nature of prokaryotes. We propose instead a universal tree of life with the root in the eukaryotic branch and suggest that many prokaryotic features of the information processing mechanisms originated by simplification through gene loss and non-orthologous displacement.

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