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- Title
Red Algal Mitochondrial Genomes Are More Complete than Previously Reported.
- Authors
Salomaki, Eric D.; Lane, Christopher E.
- Abstract
The enslavement of an alpha-proteobacterial endosymbiont by the last common eukaryotic ancestor resulted in large-scale gene transfer of endosymbiont genes to the host nucleus as the endosymbiont transitioned into the mitochondrion. Mitochondrial genomes have experienced widespread gene loss and genome reduction within eukaryotes and DNA sequencing has revealed that most of thesegene lossesoccurredearly in eukaryotic lineagediversification. On a broad scale, more recent modifications to organelle genomes appear to be conserved and phylogenetically informative. The first red algalmitochondrial genome was sequencedmore than 20 years ago, and an additional 29 Florideophyceaemitochondria have been added over the past decade. A total of 32 genes have been described to have been missing or considered non-functional pseudogenes from these Florideophyceae mitochondria. These losses have been attributed to endosymbiotic gene transfer or the evolution of a parasitic life strategy. Herewe sequenced the mitochondrial genomes from the red algal parasite Choreocolax polysiphoniae and its host Vertebrata lanosa and found them to be complete and conserved in structure with other Florideophyceae mitochondria. This result led us to resequence the previously published parasite Gracilariophila oryzoides and its host Gracilariopsis andersonii, as well as reevaluate reported gene losses from published Florideophyceae mitochondria. Multiple independent losses of rpl20 and a single loss of rps11 can be verified. However by reannotating published data and resequencing specimens when possible, we were able to identify the majority of genes that have been reported as lost or pseudogenes from Florideophyceae mitochondria.
- Subjects
RED algae; GENETIC transformation; MITOCHONDRIAL DNA; NUCLEOTIDE sequencing; EUKARYOTES
- Publication
Genome Biology & Evolution, 2017, Vol 9, Issue 1, p48
- ISSN
1759-6653
- Publication type
Article
- DOI
10.1093/gbe/evw267