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Science. 2002 Nov 22;298(5598):1616-20.

Whole-genome analysis of photosynthetic prokaryotes.

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

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PMID:
12446909
[PubMed - indexed for MEDLINE]
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