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Journal Article
Review
Blastocystis phylogeny among various isolates from humans to insects.
Parasitology International 2016 December
Blastocystis is a common unicellular eukaryotic parasite found not only in humans, but also in various kinds of animal species worldwide. Since Blastocystis isolates are morphologically indistinguishable, many molecular biological approaches have been applied to classify these isolates. The complete or partial sequences of the small subunit rRNA gene (SSU rDNA) are mainly used for comparisons and phylogenetic analyses among Blastocystis isolates. However, various lengths of the partial SSU rDNA sequence have been used for phylogenetic inference among genetically different isolates. Based on the complete SSU rDNA sequences, consensus terminology of nine subtypes (STs) of Blastocystis sp. that were supported by phylogenetically monophyletic nine clades was proposed in 2007. Thereafter, eight additional kinds of STs comprising non-human mammalian Blastocystis isolates have been reported based on the phylogeny of SSU rDNA sequences, while STs 11 and 12 were only proposed on the base of partial sequences. Although many sequence data from mammalian and avian Blastocystis are registered in GenBank, only limited data on SSU rDNA are available for poikilotherm-derived Blastocystis isolates. Therefore, the phylogenetic positions of the reptilian/amphibian Blastocystis clades are unstable. The phylogenetic inference of various STs comprising mammalian and/or avian Blastocystis isolates was verified herein based on comparisons between partial and complete SSU rDNA sequences, and the phylogenetic positions of reptilian and amphibian Blastocystis isolates were also investigated using 14 new Blastocystis isolates from reptiles with all known isolates from other reptilians, amphibians, and insects registered in GenBank.
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