Whole-Genome Analysis of Photosynthetic Prokaryotes

Author:

Raymond Jason1,Zhaxybayeva Olga2,Gogarten J. Peter2,Gerdes Sveta Y.3,Blankenship Robert E.1

Affiliation:

1. Department of Chemistry and Biochemistry, Arizona State University (ASU), Tempe, AZ 85287–1604, USA.

2. Department of Molecular and Cell Biology, University of Connecticut, Storrs, CT 06269–3044, USA.

3. Integrated Genomics, 2201 West Campbell Park Drive, Chicago, IL 60612, USA.

Abstract

The process of photosynthesis has had profound global-scale effects on Earth; however, its origin and evolution remain enigmatic. Here we report a whole-genome comparison of representatives from all five groups of photosynthetic prokaryotes and show that horizontal gene transfer has been pivotal in their evolution. Excluding a small number of orthologs that show congruent phylogenies, the genomes of these organisms represent mosaics of genes with very different evolutionary histories. We have also analyzed a subset of “photosynthesis-specific” genes that were elucidated through a differential genome comparison. Our results explain incoherencies in previous data-limited phylogenetic analyses of phototrophic bacteria and indicate that the core components of photosynthesis have been subject to lateral transfer.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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