Chromatophore Genome Sequence of Paulinella Sheds Light on Acquisition of Photosynthesis by Eukaryotes

@article{Nowack2008ChromatophoreGS,
  title={Chromatophore Genome Sequence of Paulinella Sheds Light on Acquisition of Photosynthesis by Eukaryotes},
  author={Eva C. M. Nowack and Michael Melkonian and Gernot Gl{\"o}ckner},
  journal={Current Biology},
  year={2008},
  volume={18},
  pages={410-418}
}
BACKGROUND It is commonly accepted that a single primary endosymbiosis gave rise to the photosynthetic organelles of plants, the plastids. Recently, we presented evidence that photosynthetic inclusions, termed "chromatophores," present in the filose thecamoeba Paulinella chromatophora originated from an independent, more recent primary endosymbiotic event. To clarify metabolic capabilities of the chromatophore and its state of integration into the host, we present here the complete genome… Expand
Another acquisition of a primary photosynthetic organelle is underway in Paulinella chromatophora
Summary The birth of plastids brought photosynthesis to eukaryotes and had a huge impact on their evolution. Despite its importance, details of the plastid acquisition process through primaryExpand
Endosymbiotic gene transfer and transcriptional regulation of transferred genes in Paulinella chromatophora.
TLDR
The identification of a significant number of transferred genes involved in photosynthesis and photoacclimation of thylakoid membranes as well as the observed transcriptional regulation of these genes strongly implies import of the encoded gene products into chromatophores, a feature previously thought to be restricted to canonical organelles. Expand
Protein translocons in photosynthetic organelles of Paulinella chromatophora
TLDR
It is revealed that chromatophore genomes from both Paulinella strains encode the same set of translocons that could potentially create a simplified but fully-functional Tic-like complex at the inner chromatsophore membranes. Expand
Evolutionary dynamics of the chromatophore genome in three photosynthetic Paulinella species
TLDR
This analysis suggests that when a basal split occurred among photosynthetic Paulinella species ca. Expand
Breaking the endosymbiont-organelle border : the case of Paulinella chromatophora
Primary endosymbiosis gave rise to photosynthetic eukaryotes (glaucophytes, red algae and green plants) about 1.5 billion years ago, when a phagotrophic eukaryote enslaved a cyanobacterium,Expand
Impact of light intensity and quality on chromatophore and nuclear gene expression in Paulinella chromatophora, an amoeba with nascent photosynthetic organelles
TLDR
It is found that this organism is light sensitive and lacks light-induced transcriptional regulation of chromatophore genes and most EGT-derived nuclear genes, but several ncHLI genes have reestablished light-dependent regulation, which appears analogous to what is observed in cyanobacteria. Expand
A single origin of the photosynthetic organelle in different Paulinella lineages
TLDR
The results indicate that Paulinella chromatophora comprises at least two distinct evolutionary lineages and likely encompasses a broader taxonomic diversity than previously thought. Expand
Gene transfers from diverse bacteria compensate for reductive genome evolution in the chromatophore of Paulinella chromatophora
TLDR
A dominant role for HGT in compensating for organelle genome reduction is demonstrated and it is suggested that phagotrophy may be a major driver of HGT. Expand
Amoeba Genome Reveals Dominant Host Contribution to Plastid Endosymbiosis
TLDR
It was recently hypothesized that large double-stranded DNA viruses may have driven gene transfer to the nucleus in Paulinella and facilitated endosymbiosis, but analyses suggest that these viruses in the KR01 and closely related P. micropora MYN1 genomes resulted from a more recent invasion. Expand
Trafficking of protein into the recently established photosynthetic organelles of Paulinella chromatophora
Endosymbiotic acquisition of bacteria by a protist, with subsequent evolution of the bacteria into mitochondria and plastids, had a transformative impact on eukaryotic biology. Reconstructing eventsExpand
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