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Phylogenetic position of Protoopalina intestinalis based on SSU rRNA gene sequence.

Abstract：

:A robust recognition of phylogenetic affinities of Opalinidae-the peculiar multinucleated intestine commensals of frogs-is hindered by the absence of reliable molecular data. Up to now all attempts to sequence opalinid genes failed, as the obtained sequences labeled as Protoopalina intestinalis, Cepedea virguloidea, and Opalina ranarum in GenBank apparently originate from a zygomycete contamination. In this paper, we present the first molecular data for the family Opalinidae-SSU rRNA gene of P. intestinalis. Our phylogenetic analyses undoubtedly show opalinids as a sister group to Proteromonas within the Stramenopila clade, confirming the monophyly of Patterson's order Slopalinida. The enigmatic genus Blastocystis is resolved with high statistical support as a sister group to Slopalinida. The information contained in the SSU rRNA gene proved insufficient to uncover broader affinities of this group to other groups of Stramenopila. Nevertheless, our analyses clearly demonstrate that Cavalier-Smith's phylum Bigyra, which comprises Oomycetes and their relatives together with Slopalinida and Blastocystis, is not monophyletic.

journal_name

Mol Phylogenet Evol

journal_title

Molecular phylogenetics and evolution

authors

Kostka M,Hampl V,Cepicka I,Flegr J

doi

10.1016/j.ympev.2004.05.009

keywords:

subject

Has Abstract

pub_date

2004-10-01 00:00:00

pages

220-4

issue

1

eissn

1055-7903

issn

1095-9513

pii

S1055-7903(04)00172-1

journal_volume

33

pub_type

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