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Whole-Genome Analysis of Photosynthetic Prokaryotes
Jason Raymond,1*Olga Zhaxybayeva,2*J. Peter Gogarten,2Sveta Y. Gerdes,3Robert E. Blankenship1
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
fromall five groups of photosynthetic prokaryotes and show that
horizontalgene transfer has been pivotal in their evolution. Excluding
asmall number of orthologs that show congruent phylogenies, thegenomes of these organisms represent mosaics of genes with verydifferent evolutionary histories. We have also analyzed a subsetof
"photosynthesis-specific" genes that were elucidated througha
differential genome comparison. Our results explain incoherenciesin
previous data-limited phylogenetic analyses of phototrophicbacteria
and indicate that the core components of photosynthesishave been
subject to lateral transfer.
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.
*
These authors contributed equally to this paper.
To whom correspondence should be addressed. E-mail:
blankenship{at}asu.edu
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