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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Re-evaluating the green versus red signal in eukaryotes with secondary plastid of red algal origin
Genome Biology and Evolution, Volume 4, No. 6, Year 2012
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Description
The transition from endosymbiont to organelle in eukaryotic cells involves the transfer of significant numbers of genes to the host genomes, a process known as endosymbiotic gene transfer (EGT). In the case of plastid organelles, EGTs have been shown to leave a footprint in the nuclear genome that can be indicative of ancient photosynthetic activity in present-day plastid-lacking organisms, or even hint at the existence of cryptic plastids. Here,we evaluated the impact of EGTon eukaryote genomes by reanalyzing the recently published EST dataset for Chromera velia, an interesting test case of a photosynthetic alga closely related to apicomplexan parasites. Previously, 513 genes were reported to originate from red and green algae in a 1:1 ratio. In contrast, by manually inspecting newly generated trees indicating putative algal ancestry, we recovered only 51 genes congruent with EGT, of which 23 and 9 were of red and green algal origin, respectively,whereas 19 were ambiguous regarding the algal provenance.Our approach also uncovered 109 genes that branched within a monocot angiosperm clade, most likely representing a contamination. We emphasize the lack of congruence and the subjectivity resulting from independent phylogenomic screens for EGT, which appear to call for extreme caution when drawing conclusions for major evolutionary events. © 2012 The Author(s).
Authors & Co-Authors
Burki, Fabien
Canada, Vancouver
The University of British Columbia
Flegontov, Pavel N.
Czech Republic, Ceske Budejovice
Institute of Parasitology, Biology Centre of the Academy of Sciences of the Czech Republic
Oborník, Miroslav
Czech Republic, Ceske Budejovice
Institute of Parasitology, Biology Centre of the Academy of Sciences of the Czech Republic
Czech Republic, Ceske Budejovice
Jihočeská Univerzita V Českých Budějovicích
Czech Republic, Prague
Academy of Sciences of the Czech Republic
Cihlář, Jaromír
Czech Republic, Ceske Budejovice
Institute of Parasitology, Biology Centre of the Academy of Sciences of the Czech Republic
Pain, Arnab P.
Saudi Arabia, Thuwal
King Abdullah University of Science and Technology
Lukeš, Julius
Czech Republic, Ceske Budejovice
Institute of Parasitology, Biology Centre of the Academy of Sciences of the Czech Republic
Czech Republic, Ceske Budejovice
Jihočeská Univerzita V Českých Budějovicích
Keeling, Patrick J.
Canada, Vancouver
The University of British Columbia
Statistics
Citations: 68
Authors: 7
Affiliations: 5
Identifiers
Doi:
10.1093/gbe/evs049
e-ISSN:
17596653
Research Areas
Cancer
Genetics And Genomics