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4 results for “Microheliella”
Microheliella maris possesses the most gene-rich mitochondiral genome in Diaphoretikes
<p>The mitochondrial genomes are very diverse, but their evolutionary history is unclear due to the lack of efforts to sequence that of protists (unicellular eukaryotes), which cover a major part of the eukaryotic tree. Cryptista comprises cryptophytes, goniomonads, kathablepharids, and <em>Palpitomonas bilix</em>, and their mitochondrial genomes (mt-genomes) are characterized by various gene contents, particularly the presence/absence of an ancestral (bacterial) system for the cytochrome c maturation system. To shed light on mt-genome evolution in Cryptista, we report the complete mt-genome of <em>Microheliella maris</em>, which was recently revealed to branch at the root of Cryptista. The <em>M. maris</em> mt-genome was reconstructed as a circular mapping chromosome of 61.2 kbp with a pair of inverted repeats (12.9 kbp) and appeared to be the most gene-rich among the mt-genomes of the members of Diaphoretickes (a mega-scale eukaryotic assembly including Archaeplastida, Cryptista, Haptista, and SAR) studied so far, carrying 53 protein-coding genes. With this newly sequenced mt-genome, we inferred and discussed the evolution of the mtgenome in Cryptista and Diaphoretickes.</p>
Microheliella maris possesses the most gene-rich mitochondiral genome in Diaphoretikes
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The closest relative of Archaeplastida is revealed by phylogenomic analyses that include Microheliella maris
<p>By clarifying the phylogenetic positions of "orphan" protists (unicellular micro-eukaryotes with no affinity to extant species/lineages), we may uncover the novel affiliation between two (or more) major lineages in eukaryotes. <em>Microheliella maris</em> was an orphan protist, which failed to be placed within the previously described species/lineages by pioneering phylogenetic analyses. In this study, we analyzed a 319-gene alignment and demonstrated that <em>M. maris</em> represents a basal lineage of one of the major eukaryotic lineages, Cryptista. We here propose a new clade name "Pancryptista" for Cryptista plus <em>M. maris</em>. The 319-gene analyses also indicated that <em>M. maris</em> is a key taxon to recover the monophyly of Archaeplastida and the sister relationship between Archaeplastida and Pancryptista, which is collectively called as "CAM clade" here. Significantly, Cryptophyceae tend to be attracted to Rhodophyta depending on the taxon sampling (ex., in the absence of <em>M. maris</em> and Rhodelphidia) and the particular phylogenetic 'signal' most likely hindered the stable recovery of the monophyly of Archaeplastida in previous studies.</p>
The closest relative of Archaeplastida is revealed by phylogenomic analyses that include Microheliella maris
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