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Intrageneric Variability Between the Chloroplast Genomes of Trachelomonas grandis and Trachelomonas volvocina and Phylogenomic Analysis of Phototrophic Euglenoids

Intrageneric Variability Between the Chloroplast Genomes of Trachelomonas grandis and Trachelomonas volvocina and Phylogenomic Analysis of Phototrophic Euglenoids

Journal of Eukaryotic Microbiology 65(5): 648-660

The latest studies of chloroplast genomes of phototrophic euglenoids yielded different results according to intrageneric variability such as cluster arrangement or diversity of introns. Although the genera Euglena and Monomorphina in those studies show high syntenic arrangements at the intrageneric level, the two investigated Eutreptiella species comprise low synteny. Furthermore Trachelomonas volvocina show low synteny to the chloroplast genomes of the sister genera Monomorphina aenigmatica, M. parapyrum, Cryptoglena skujae, Euglenaria anabaena, Strombomonas acuminata, all of which were highly syntenic. Consequently, this study aims at the analysis of the cpGenome of Trachelomonas grandis and a comparative examination of T. volvocina to investigate whether the cpGenomes are of such resemblance as could be expected for a genus within the Euglenaceae. Although these analyses resulted in almost identical gene content to other Euglenaceae, the chloroplast genome showed significant novelties: In the rRNA operon, we detected group II introns, not yet found in any other cpGenome of Euglenaceae and a substantially heterogeneous cluster arrangement in the genus Trachelomonas. The phylogenomic analysis with 84 genes of 19 phototrophic euglenoids and 18 cpGenome sequences from Chlorophyta and Streptophyta resulted in a well-supported cpGenome phylogeny, which is in accordance to former phylogenetic analyses.

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Accession: 065253000

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PMID: 29418041

DOI: 10.1111/jeu.12510

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