Document Detail


The plastid genome of Eutreptiella provides a window into the process of secondary endosymbiosis of plastid in euglenids.
MedLine Citation:
PMID:  22448269     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Euglenids are a group of protists that comprises species with diverse feeding modes. One distinct and diversified clade of euglenids is photoautotrophic, and its members bear green secondary plastids. In this paper we present the plastid genome of the euglenid Eutreptiella, which we assembled from 454 sequencing of Eutreptiella gDNA. Comparison of this genome and the only other available plastid genomes of photosynthetic euglenid, Euglena gracilis, revealed that they contain a virtually identical set of 57 protein coding genes, 24 genes fewer than the genome of Pyramimonas parkeae, the closest extant algal relative of the euglenid plastid. Searching within the transcriptomes of Euglena and Eutreptiella showed that 6 of the missing genes were transferred to the nucleus of the euglenid host while 18 have been probably lost completely. Euglena and Eutreptiella represent the deepest bifurcation in the photosynthetic clade, and therefore all these gene transfers and losses must have happened before the last common ancestor of all known photosynthetic euglenids. After the split of Euglena and Eutreptiella only one additional gene loss took place. The conservation of gene content in the two lineages of euglenids is in contrast to the variability of gene order and intron counts, which diversified dramatically. Our results show that the early secondary plastid of euglenids was much more susceptible to gene losses and endosymbiotic gene transfers than the established plastid, which is surprisingly resistant to changes in gene content.
Authors:
Štěpánka Hrdá; Jan Fousek; Jana Szabová; Vladimír Hampl; Vladimír Hampl; Čestmír Vlček
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-03-20
Journal Detail:
Title:  PloS one     Volume:  7     ISSN:  1932-6203     ISO Abbreviation:  PLoS ONE     Publication Date:  2012  
Date Detail:
Created Date:  2012-03-26     Completed Date:  2012-08-20     Revised Date:  2013-06-26    
Medline Journal Info:
Nlm Unique ID:  101285081     Medline TA:  PLoS One     Country:  United States    
Other Details:
Languages:  eng     Pagination:  e33746     Citation Subset:  IM    
Affiliation:
Charles University in Prague, Faculty of Science, Department of Parasitology, Prague, Czech Republic.
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MeSH Terms
Descriptor/Qualifier:
Biological Evolution*
Euglenida / genetics*
Euglenozoa Infections / genetics,  pathology*
Genome, Plastid*
Phylogeny
Plastids / genetics*
Symbiosis / physiology*
Comments/Corrections
Erratum In:
PLoS One. 2012;7(4): doi/10.1371/annotation/3f9f229e-e4e1-457b-b33d-89950e1799c5
Note: Hampl, Vladimír 5th [corrected to Hampl, Vladimír]
PLoS One. 2012;7(6): doi/10.1371/annotation/c03a517b-fade-4f91-ae19-8ccb2eea697c

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