Phylogenetic position of Blastocystis hominis and of stramenopiles inferred from multiple molecular sequence data

The Journal of Eukaryotic Microbiology
Nobuko ArisueMasami Hasegawa

Abstract

Blastocystis hominis, a parasite of the human intestine, has recently been positioned within stramenopiles by the small subunit rRNA phylogeny. To further confirm its phylogenetic position using multiple molecular sequence data, we determined the nucleotide sequences putatively encoding small subunit ribosomal RNA, cytosolic-type 70-kDa heat shock protein, translation elongation factor 2, and the non-catalytic 'B' subunit of vacuolar ATPase of B. hominis (HE87-1 strain). Moreover, we determined the translation elongation factor 2 sequence of an apicomplexan parasite, Plasmodium falciparum, that belongs to alveolates. The maximum likelihood analyses of small subunit rRNA and cytosolic-type 70-kDa heat shock protein clearly demonstrated that B. hominis (HE87-1 strain) is positioned within stramenopiles, being congruent with the previous small subunit rRNA analysis, including the sequences of B. hominis (Nand strain) and a Blastocystis isolate from guinea pig. Although no clear resolution among major eukaryotic groups was obtained by the individual phylogenies based on the four molecules analyzed here, a combined analysis of various molecules, including these, clearly indicated that Blastocystis/stramenopiles are the closest relat...Continue Reading

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Datasets Mentioned

BETA
D79219
AB023579
AB023580
AB023581
AB023499
AB023578

Methods Mentioned

BETA
cDNA library
PCR

Software Mentioned

MOLPHY
PAML
CODEML
PROTML
NUCML
BASEML
TOTALML
CONSEL
SAM

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