Differential gene transfers and gene duplications in primary and secondary endosymbioses.

BMC Evolutionary Biology
S ZaunerUwe G Maier

Abstract

Most genes introduced into phototrophic eukaryotes during the process of endosymbiosis are either lost or relocated into the host nuclear genome. In contrast, groEL homologues are found in different genome compartments among phototrophic eukaryotes. Comparative sequence analyses of recently available genome data, have allowed us to reconstruct the evolutionary history of these genes and propose a hypothesis that explains the unusual genome distribution of groEL homologues. Our analyses indicate that while two distinct groEL genes were introduced into eukaryotes by a progenitor of plastids, these particular homologues have not been maintained in all evolutionary lineages. This is of significant interest, because two chaperone proteins always co-occur in oxygenic photosynthetic organisms. We infer strikingly different lineage specific processes of evolution involving deletion, duplication and targeting of groEL proteins. The requirement of two groEL homologues for chaperon function in phototrophs has provided a constraint that has shaped convergent evolutionary scenarios in divergent evolutionary lineages. GroEL provides a general evolutionary model for studying gene transfers and convergent evolutionary processes among eukaryoti...Continue Reading

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Citations

Jun 9, 2006·Proceedings of the National Academy of Sciences of the United States of America·Paul R GilsonGeoffrey I McFadden
May 7, 2009·FEMS Microbiology Reviews·Peter A Lund
Apr 5, 2013·Biological Reviews of the Cambridge Philosophical Society·Brian HendersonPeter A Lund

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Methods Mentioned

BETA
protein folding

Software Mentioned

ProtTest
CLUSTALX
BLAST
SplitsTree4
PhyML
PlasmoDB

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