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Title 

A phylogenomic census of molecular functions identifies modern thermophilic archaea as the most ancient form of cellular life

Authors 

A NasirKyung Mo KimG Caetano-Anolles

Publisher 

Hindawi Publishing Corporation

Issue Date 

2014

Citation 

Archaea, vol. 2014, no. 0, pp. 706468-706468

Abstract 

The origins of diversified life remain mysterious despite considerable efforts devoted to untangling the roots of the universal tree of life. Here we reconstructed phylogenies that described the evolution of molecular functions and the evolution of species directly from a genomic census of gene ontology (GO) definitions. We sampled 249 free-living genomes spanning organisms in the three superkingdoms of life, Archaea, Bacteria, and Eukarya, and used the abundance of GO terms as molecular characters to produce rooted phylogenetic trees. Results revealed an early thermophilic origin of Archaea that was followed by genome reduction events in microbial superkingdoms. Eukaryal genomes displayed extraordinary functional diversity and were enriched with hundreds of novel molecular activities not detected in the akaryotic microbial cells. Remarkably, the majority of these novel functions appeared quite late in evolution, synchronized with the diversification of the eukaryal superkingdom. The distribution of GO terms in superkingdoms confirms that Archaea appears to be the simplest and most ancient form of cellular life, while Eukarya is the most diverse and recent.

ISSN 

1472-3646

Link 

http://dx.doi.org/10.1155/2014/706468

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2017-04-19


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