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Biol Direct. 2011 Jun 30;6:36.

Early evolution without a tree of life.

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Institut of Botany III, University of Düsseldorf, 40225 Düsseldorf, Germany. w.martin@uni-duesseldorf.de

Abstract

Life is a chemical reaction. Three major transitions in early evolution are considered without recourse to a tree of life. The origin of prokaryotes required a steady supply of energy and electrons, probably in the form of molecular hydrogen stemming from serpentinization. Microbial genome evolution is not a treelike process because of lateral gene transfer and the endosymbiotic origins of organelles. The lack of true intermediates in the prokaryote-to-eukaryote transition has a bioenergetic cause.

PMID:: 21714942; [PubMed - indexed for MEDLINE]
PMCID:: PMC3158116

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