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Title: A molecular phylogeny of Asian species of the genus Metagonimus (Digenea)—small intestinal flukes—based on representative Japanese populations
Authors: Siritavee Pornruseetairatn
Hideto Kino
Takeshi Shimazu
Yukifumi Nawa
Tomáš Scholz
Jiraporn Ruangsittichai
Naowarat Tanomsing Saralamba
Urusa Thaenkham
Mahidol University
Hamamatsu University School of Medicine
Khon Kaen University
Institute of Parasitology, Biology Centre of the Academy of Sciences of the Czech Republic
Keywords: Agricultural and Biological Sciences;Immunology and Microbiology
Issue Date: 1-Mar-2016
Citation: Parasitology Research. Vol.115, No.3 (2016), 1123-1130
Abstract: © 2015, Springer-Verlag Berlin Heidelberg. Metagonimus Katsurada, 1912 is a genus of small intestinal parasites. The genus comprises eight species, primarily from far-eastern Asia, with two exceptions reported from Europe. Metagonimus yokogawai, the most widespread species, is the main agent responsible for the intestinal disease, metagonimiasis, in Japan and some other East Asian countries. On the basis of the ratio of the size of the ventral and oral suckers, Metagonimus has traditionally been morphologically divided into two groups; however, the genus has not been extensively studied using molecular data. To reveal phylogenetic relationships within Metagonimus based on molecular data, we analyzed six of the seven species present in Asia using samples collected in central Japan. Maximum likelihood and Bayesian analyses of a combined 28S ribosomal DNA (rDNA), internal transcribed spacer 2 (ITS2), and mitochondrial cox1 gene sequence dataset separated the six species into two well-supported clades. One clade comprised M. yokogawai, M. takahashii, M. miyatai, and M. hakubaensis, whereas the other consisted of M. otsurui and M. katsuradai. Genetic distances calculated from 28S rDNA and ITS2 nucleotide sequences and a comparison of the predicted amino acid sequences of cox1 gene suggested that M. otsurui and M. katsuradai may have diverged recently. None of the four main morphological characters used to delimit species of Metagonimus (i.e., sucker ratio, positions of the uterus and testes, and distribution of vitelline follicles) was consistent with the distribution of species in the molecular tree.
ISSN: 14321955
Appears in Collections:Scopus 2016-2017

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